リモートのOracle Linux 7ホストに、ELSA-2021-9104アドバイザリに記載されている複数の脆弱性の影響を受けるパッケージがインストールされています。

  - QEMU 4.1.0のblock/iscsi.cのiscsi_aio_ioctl_cbには、ヒープベースのバッファオーバーリードがあり、プロセスメモリから攻撃者に無関係な情報を漏洩する可能性があります。（CVE-2020-11947）

  - QEMU 5.1.0のhw/ide/atapi.cにあるide_atapi_cmd_reply_endでは、バッファインデックスが検証されないため、領域外の読み取りアクセスが可能です。（CVE-2020-29443）

  - ゲストOSユーザーが、QEMU 4.2.1のnet/eth.cのeth_get_gso_typeを使用してアサーション失敗をトリガーすることが可能です。ゲストは、有効なレイヤー3プロトコルがないパケットデータを介して、QEMUプロセスをクラッシュさせる可能性があります。（CVE-2020-27617）

  - QEMU 4.1.0で、ATI VGAの実装に領域外読み取りの欠陥が見つかりました。これは、ati_mm_write()コールバックを通じてMMIO書き込み操作を処理している間に、ati_cursor_define()ルーチンで発生します。悪意のあるゲストがこの問題を利用して、QEMUプロセスをクラッシュさせ、その結果サービス拒否がもたらされる可能性があります。
    （CVE-2019-20808）

Nessusはこの問題をテストしておらず、代わりにアプリケーションの自己報告されたバージョン番号にのみ依存しています。

リモートホストにインストールされているqemuのバージョンは、3.1.0-8より前のものです。したがって、ALAS2-2021-1671のアドバイザリに記載されている複数の脆弱性の影響を受けます。

  - QEMU 4.1.0のblock/iscsi.cのiscsi_aio_ioctl_cbには、ヒープベースのバッファオーバーリードがあり、プロセスメモリから攻撃者に無関係な情報を漏洩する可能性があります。（CVE-2020-11947）

  - **拒否** この候補番号は使用しないでください。理由：この候補はCVE-2020-28916の複製です（CVE-2020-25707）

  - 到達可能なアサーションの問題が、QEMUのUSB EHCIエミュレーションコードで見つかりました。これは、DMAメモリマップ障害の処理の欠落により、USBリクエストの処理中に発生する可能性があります。ゲスト内の悪意のある特権ユーザーがこの欠陥を悪用して偽造のUSBリクエストを送信し、ホストでQEMUプロセスをクラッシュさせ、サービス拒否を引き起こす可能性があります。（CVE-2020-25723）

  - メモリ領域キャッシュの初期化中に、QEMUのメモリ管理APIに欠陥が見つかりました。
    この問題により、MMIO操作の実行中にMSI-Xテーブルへの領域外書き込みアクセスが発生する可能性があります。ゲストユーザーがこの欠陥を悪用して、ホスト上でQEMUプロセスをクラッシュさせ、サービス拒否を引き起こす可能性があります。この欠陥は、5.2.0より前のQEMUバージョンに影響を与えます。（CVE-2020-27821）

  - 4.3.1までのlibslirpにあるncsi.cは、パケットの合計長を超えている場合でも、特定量のヘッダーデータの読み取りを試みるため、バッファオーバーリードを引き起こします。（CVE-2020-29129）

  - 4.3.1までのlibslirpにあるslirp.cは、パケットの合計長を超えている場合でも、特定量のヘッダーデータの読み取りを試みるため、バッファオーバーリードを引き起こします。（CVE-2020-29130）

  - QEMU 5.1.0のhw/ide/atapi.cにあるide_atapi_cmd_reply_endでは、バッファインデックスが検証されないため、領域外の読み取りアクセスが可能です。（CVE-2020-29443）

Nessusはこの問題をテストしておらず、代わりにアプリケーションの自己報告されたバージョン番号にのみ依存しています。

The remote Rocky Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2021:1762 advisory.

  - iscsi_aio_ioctl_cb in block/iscsi.c in QEMU 4.1.0 has a heap-based buffer over-read that may disclose     unrelated information from process memory to an attacker. (CVE-2020-11947)

  - In QEMU through 5.0.0, an assertion failure can occur in the network packet processing. This issue affects     the e1000e and vmxnet3 network devices. A malicious guest user/process could use this flaw to abort the     QEMU process on the host, resulting in a denial of service condition in net_tx_pkt_add_raw_fragment in     hw/net/net_tx_pkt.c. (CVE-2020-16092)

  - A double free memory issue was found to occur in the libvirt API, in versions before 6.8.0, responsible     for requesting information about network interfaces of a running QEMU domain. This flaw affects the polkit     access control driver. Specifically, clients connecting to the read-write socket with limited ACL     permissions could use this flaw to crash the libvirt daemon, resulting in a denial of service, or     potentially escalate their privileges on the system. The highest threat from this vulnerability is to data     confidentiality and integrity as well as system availability. (CVE-2020-25637)

  - A reachable assertion issue was found in the USB EHCI emulation code of QEMU. It could occur while     processing USB requests due to missing handling of DMA memory map failure. A malicious privileged user     within the guest may abuse this flaw to send bogus USB requests and crash the QEMU process on the host,     resulting in a denial of service. (CVE-2020-25723)

  - A flaw was found in the memory management API of QEMU during the initialization of a memory region cache.
    This issue could lead to an out-of-bounds write access to the MSI-X table while performing MMIO     operations. A guest user may abuse this flaw to crash the QEMU process on the host, resulting in a denial     of service. This flaw affects QEMU versions prior to 5.2.0. (CVE-2020-27821)

  - hw/net/e1000e_core.c in QEMU 5.0.0 has an infinite loop via an RX descriptor with a NULL buffer address.
    (CVE-2020-28916)

  - ncsi.c in libslirp through 4.3.1 has a buffer over-read because it tries to read a certain amount of     header data even if that exceeds the total packet length. (CVE-2020-29129)

  - slirp.c in libslirp through 4.3.1 has a buffer over-read because it tries to read a certain amount of     header data even if that exceeds the total packet length. (CVE-2020-29130)

  - ide_atapi_cmd_reply_end in hw/ide/atapi.c in QEMU 5.1.0 allows out-of-bounds read access because a buffer     index is not validated. (CVE-2020-29443)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Alibaba Cloud Linux 3 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALINUX3-SA-2022:0119 advisory.

    Package updates are available for Alibaba Cloud Linux 3 that fix the following vulnerabilities:

    CVE-2018-12130:
    Microarchitectural Fill Buffer Data Sampling (MFBDS): Fill buffers on some microprocessors utilizing     speculative execution may allow an authenticated user to potentially enable information disclosure via a     side channel with local access. A list of impacted products can be found here:
    https://www.intel.com/content/dam/www/public/us/en/documents/corporate-information/SA00233-microcode-     update-guidance_05132019.pdf

    CVE-2018-13405:
    The inode_init_owner function in fs/inode.c in the Linux kernel through 3.16 allows local users to create     files with an unintended group ownership, in a scenario where a directory is SGID to a certain group and     is writable by a user who is not a member of that group. Here, the non-member can trigger creation of a     plain file whose group ownership is that group. The intended behavior was that the non-member can trigger     creation of a directory (but not a plain file) whose group ownership is that group. The non-member can     escalate privileges by making the plain file executable and SGID.

    CVE-2019-10132:
    A vulnerability was found in libvirt >= 4.1.0 in the virtlockd-admin.socket and virtlogd-admin.socket     systemd units. A missing SocketMode configuration parameter allows any user on the host to connect using     virtlockd-admin-sock or virtlogd-admin-sock and perform administrative tasks against the virtlockd and     virtlogd daemons.

    CVE-2019-10161:
    It was discovered that libvirtd before versions 4.10.1 and 5.4.1 would permit read-only clients to use the     virDomainSaveImageGetXMLDesc() API, specifying an arbitrary path which would be accessed with the     permissions of the libvirtd process. An attacker with access to the libvirtd socket could use this to     probe the existence of arbitrary files, cause denial of service or cause libvirtd to execute arbitrary     programs.

    CVE-2019-10166:
    It was discovered that libvirtd, versions 4.x.x before 4.10.1 and 5.x.x before 5.4.1, would permit     readonly clients to use the virDomainManagedSaveDefineXML() API, which would permit them to modify managed     save state files. If a managed save had already been created by a privileged user, a local attacker could     modify this file such that libvirtd would execute an arbitrary program when the domain was resumed.

    CVE-2019-10167:
    The virConnectGetDomainCapabilities() libvirt API, versions 4.x.x before 4.10.1 and 5.x.x before 5.4.1,     accepts an emulatorbin argument to specify the program providing emulation for a domain. Since v1.2.19,     libvirt will execute that program to probe the domain's capabilities. Read-only clients could specify an     arbitrary path for this argument, causing libvirtd to execute a crafted executable with its own     privileges.

    CVE-2019-10168:
    The virConnectBaselineHypervisorCPU() and virConnectCompareHypervisorCPU() libvirt APIs, 4.x.x before     4.10.1 and 5.x.x before 5.4.1, accept an emulator argument to specify the program providing emulation     for a domain. Since v1.2.19, libvirt will execute that program to probe the domain's capabilities. Read-     only clients could specify an arbitrary path for this argument, causing libvirtd to execute a crafted     executable with its own privileges.

    CVE-2019-11135:
    TSX Asynchronous Abort condition on some CPUs utilizing speculative execution may allow an authenticated     user to potentially enable information disclosure via a side channel with local access.

    CVE-2019-12155:
    interface_release_resource in hw/display/qxl.c in QEMU 3.1.x through 4.0.0 has a NULL pointer dereference.

    CVE-2019-14378:
    ip_reass in ip_input.c in libslirp 4.0.0 has a heap-based buffer overflow via a large packet because it     mishandles a case involving the first fragment.

    CVE-2019-14842:
    Structured reply is a feature of the newstyle NBD protocol allowing the server to send a reply in chunks.
    A bounds check which was supposed to test for chunk offsets smaller than the beginning of the request did     not work because of signed/unsigned confusion. If one of these chunks contains a negative offset then data     under control of the server is written to memory before the read buffer supplied by the client. If the     read buffer is located on the stack then this allows the stack return address from nbd_pread() to be     trivially modified, allowing arbitrary code execution under the control of the server. If the buffer is     located on the heap then other memory objects before the buffer can be overwritten, which again would     usually lead to arbitrary code execution.

    CVE-2019-15890:
    libslirp 4.0.0, as used in QEMU 4.1.0, has a use-after-free in ip_reass in ip_input.c.

    CVE-2019-20485:
    qemu/qemu_driver.c in libvirt before 6.0.0 mishandles the holding of a monitor job during a query to a     guest agent, which allows attackers to cause a denial of service (API blockage).

    CVE-2019-6501:
    In QEMU 3.1, scsi_handle_inquiry_reply in hw/scsi/scsi-generic.c allows out-of-bounds write and read     operations.

    CVE-2019-6778:
    In QEMU 3.0.0, tcp_emu in slirp/tcp_subr.c has a heap-based buffer overflow.

    CVE-2020-10703:
    A NULL pointer dereference was found in the libvirt API responsible introduced in upstream version 3.10.0,     and fixed in libvirt 6.0.0, for fetching a storage pool based on its target path. In more detail, this     flaw affects storage pools created without a target path such as network-based pools like gluster and RBD.
    Unprivileged users with a read-only connection could abuse this flaw to crash the libvirt daemon,     resulting in a potential denial of service.

    CVE-2020-10756:
    An out-of-bounds read vulnerability was found in the SLiRP networking implementation of the QEMU emulator.
    This flaw occurs in the icmp6_send_echoreply() routine while replying to an ICMP echo request, also known     as ping. This flaw allows a malicious guest to leak the contents of the host memory, resulting in possible     information disclosure. This flaw affects versions of libslirp before 4.3.1.

    CVE-2020-11947:
    iscsi_aio_ioctl_cb in block/iscsi.c in QEMU 4.1.0 has a heap-based buffer over-read that may disclose     unrelated information from process memory to an attacker.

    CVE-2020-14301:
    An information disclosure vulnerability was found in libvirt in versions before 6.3.0. HTTP cookies used     to access network-based disks were saved in the XML dump of the guest domain. This flaw allows an attacker     to access potentially sensitive information in the domain configuration via the `dumpxml` command.

    CVE-2020-14339:
    A flaw was found in libvirt, where it leaked a file descriptor for `/dev/mapper/control` into the QEMU     process. This file descriptor allows for privileged operations to happen against the device-mapper on the     host. This flaw allows a malicious guest user or process to perform operations outside of their standard     permissions, potentially causing serious damage to the host operating system. The highest threat from this     vulnerability is to confidentiality, integrity, as well as system availability.

    CVE-2020-14364:
    An out-of-bounds read/write access flaw was found in the USB emulator of the QEMU in versions before     5.2.0. This issue occurs while processing USB packets from a guest when USBDevice 'setup_len' exceeds its     'data_buf[4096]' in the do_token_in, do_token_out routines. This flaw allows a guest user to crash the     QEMU process, resulting in a denial of service, or the potential execution of arbitrary code with the     privileges of the QEMU process on the host.

    CVE-2020-15859:
    QEMU 4.2.0 has a use-after-free in hw/net/e1000e_core.c because a guest OS user can trigger an e1000e     packet with the data's address set to the e1000e's MMIO address.

    CVE-2020-16092:
    In QEMU through 5.0.0, an assertion failure can occur in the network packet processing. This issue affects     the e1000e and vmxnet3 network devices. A malicious guest user/process could use this flaw to abort the     QEMU process on the host, resulting in a denial of service condition in net_tx_pkt_add_raw_fragment in     hw/net/net_tx_pkt.c.

    CVE-2020-1711:
    An out-of-bounds heap buffer access flaw was found in the way the iSCSI Block driver in QEMU versions     2.12.0 before 4.2.1 handled a response coming from an iSCSI server while checking the status of a Logical     Address Block (LBA) in an iscsi_co_block_status() routine. A remote user could use this flaw to crash the     QEMU process, resulting in a denial of service or potential execution of arbitrary code with privileges of     the QEMU process on the host.

    CVE-2020-1983:
    A use after free vulnerability in ip_reass() in ip_input.c of libslirp 4.2.0 and prior releases allows     crafted packets to cause a denial of service.

    CVE-2020-25637:
    A double free memory issue was found to occur in the libvirt API, in versions before 6.8.0, responsible     for requesting information about network interfaces of a running QEMU domain. This flaw affects the polkit     access control driver. Specifically, clients connecting to the read-write socket with limited ACL     permissions could use this flaw to crash the libvirt daemon, resulting in a denial of service, or     potentially escalate their privileges on the system. The highest threat from this vulnerability is to data     confidentiality and integrity as well as system availability.

    CVE-2020-25723:
    A reachable assertion issue was found in the USB EHCI emulation code of QEMU. It could occur while     processing USB requests due to missing handling of DMA memory map failure. A malicious privileged user     within the guest may abuse this flaw to send bogus USB requests and crash the QEMU process on the host,     resulting in a denial of service.

    CVE-2020-27821:
    A flaw was found in the memory management API of QEMU during the initialization of a memory region cache.
    This issue could lead to an out-of-bounds write access to the MSI-X table while performing MMIO     operations. A guest user may abuse this flaw to crash the QEMU process on the host, resulting in a denial     of service. This flaw affects QEMU versions prior to 5.2.0.

    CVE-2020-28916:
    hw/net/e1000e_core.c in QEMU 5.0.0 has an infinite loop via an RX descriptor with a NULL buffer address.

    CVE-2020-29130:
    slirp.c in libslirp through 4.3.1 has a buffer over-read because it tries to read a certain amount of     header data even if that exceeds the total packet length.

    CVE-2020-29443:
    ide_atapi_cmd_reply_end in hw/ide/atapi.c in QEMU 5.1.0 allows out-of-bounds read access because a buffer     index is not validated.

    CVE-2020-7039:
    tcp_emu in tcp_subr.c in libslirp 4.1.0, as used in QEMU 4.2.0, mismanages memory, as demonstrated by IRC     DCC commands in EMU_IRC. This can cause a heap-based buffer overflow or other out-of-bounds access which     can lead to a DoS or potential execute arbitrary code.

    CVE-2021-20257:
    An infinite loop flaw was found in the e1000 NIC emulator of the QEMU. This issue occurs while processing     transmits (tx) descriptors in process_tx_desc if various descriptor fields are initialized with invalid     values. This flaw allows a guest to consume CPU cycles on the host, resulting in a denial of service. The     highest threat from this vulnerability is to system availability.

    CVE-2021-3592:
    An invalid pointer initialization issue was found in the SLiRP networking implementation of QEMU. The flaw     exists in the bootp_input() function and could occur while processing a udp packet that is smaller than     the size of the 'bootp_t' structure. A malicious guest could use this flaw to leak 10 bytes of     uninitialized heap memory from the host. The highest threat from this vulnerability is to data     confidentiality. This flaw affects libslirp versions prior to 4.6.0.

    CVE-2021-3593:
    An invalid pointer initialization issue was found in the SLiRP networking implementation of QEMU. The flaw     exists in the udp6_input() function and could occur while processing a udp packet that is smaller than the     size of the 'udphdr' structure. This issue may lead to out-of-bounds read access or indirect host memory     disclosure to the guest. The highest threat from this vulnerability is to data confidentiality. This flaw     affects libslirp versions prior to 4.6.0.

    CVE-2021-3594:
    An invalid pointer initialization issue was found in the SLiRP networking implementation of QEMU. The flaw     exists in the udp_input() function and could occur while processing a udp packet that is smaller than the     size of the 'udphdr' structure. This issue may lead to out-of-bounds read access or indirect host memory     disclosure to the guest. The highest threat from this vulnerability is to data confidentiality. This flaw     affects libslirp versions prior to 4.6.0.

    CVE-2021-3595:
    An invalid pointer initialization issue was found in the SLiRP networking implementation of QEMU. The flaw     exists in the tftp_input() function and could occur while processing a udp packet that is smaller than the     size of the 'tftp_t' structure. This issue may lead to out-of-bounds read access or indirect host memory     disclosure to the guest. The highest threat from this vulnerability is to data confidentiality. This flaw     affects libslirp versions prior to 4.6.0.

    CVE-2021-3631:
    A flaw was found in libvirt while it generates SELinux MCS category pairs for VMs' dynamic labels. This     flaw allows one exploited guest to access files labeled for another guest, resulting in the breaking out     of sVirt confinement. The highest threat from this vulnerability is to confidentiality and integrity.

    CVE-2021-3667:
    An improper locking issue was found in the virStoragePoolLookupByTargetPath API of libvirt. It occurs in     the storagePoolLookupByTargetPath function where a locked virStoragePoolObj object is not properly     released on ACL permission failure. Clients connecting to the read-write socket with limited ACL     permissions could use this flaw to acquire the lock and prevent other users from accessing storage     pool/volume APIs, resulting in a denial of service condition. The highest threat from this vulnerability     is to system availability.

    CVE-2021-3930:
    An off-by-one error was found in the SCSI device emulation in QEMU. It could occur while processing MODE     SELECT commands in mode_sense_page() if the 'page' argument was set to MODE_PAGE_ALLS (0x3f). A malicious     guest could use this flaw to potentially crash QEMU, resulting in a denial of service condition.

Tenable has extracted the preceding description block directly from the Alibaba Cloud Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

This update for qemu fixes the following issues :

Fix OOB access in sm501 device emulation (CVE-2020-12829, bsc#1172385)

Fix OOB access possibility in MegaRAID SAS 8708EM2 emulation (CVE-2020-13362 bsc#1172383)

Fix use-after-free in usb xhci packet handling (CVE-2020-25723, bsc#1178934)

Fix use-after-free in usb ehci packet handling (CVE-2020-25084, bsc#1176673)

Fix OOB access in usb hcd-ohci emulation (CVE-2020-25624, bsc#1176682)

Fix infinite loop (DoS) in usb hcd-ohci emulation (CVE-2020-25625, bsc#1176684)

Fix guest triggerable assert in shared network handling code (CVE-2020-27617, bsc#1178174)

Fix OOB access in atapi emulation (CVE-2020-29443, bsc#1181108)

Fix NULL pointer deref. (DoS) in mmio ops (CVE-2020-15469, bsc#1173612)

Fix infinite loop (DoS) in e1000 device emulation (CVE-2021-20257, bsc#1182577)

Fix OOB access (stack overflow) in rtl8139 NIC emulation (CVE-2021-3416, bsc#1182968)

Fix OOB access (stack overflow) in other NIC emulations (CVE-2021-3416)

Fix OOB access in SLIRP ARP packet processing (CVE-2020-29130, bsc#1179467)

Fix NULL pointer dereference possibility (DoS) in MegaRAID SAS 8708EM2 emulation (CVE-2020-13659 bsc#1172386

Fix OOB access in iscsi (CVE-2020-11947 bsc#1180523)

Fix OOB access in vmxnet3 emulation (CVE-2021-20203 bsc#1181639)

Fix buffer overflow in the XGMAC device (CVE-2020-15863 bsc#1174386)

Fix DoS in packet processing of various emulated NICs (CVE-2020-16092 bsc#1174641)

Fix OOB access while processing USB packets (CVE-2020-14364 bsc#1175441)

Fix package scripts to not use hard-coded paths for temporary working directories and log files (bsc#1182425)

Fix potential privilege escalation in virtfs (CVE-2021-20181 bsc#1182137)

Fix OOB access possibility in ES1370 audio device emulation (CVE-2020-13361 bsc#1172384)

Fix OOB access in ROM loading (CVE-2020-13765 bsc#1172478)

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote SUSE Linux SLES11 host has a package installed that is affected by multiple vulnerabilities as referenced in the SUSE-SU-2021:14772-1 advisory.

  - iscsi_aio_ioctl_cb in block/iscsi.c in QEMU 4.1.0 has a heap-based buffer over-read that may disclose     unrelated information from process memory to an attacker. (CVE-2020-11947)

  - In QEMU 4.2.0, a MemoryRegionOps object may lack read/write callback methods, leading to a NULL pointer     dereference. (CVE-2020-15469)

  - hw/net/xgmac.c in the XGMAC Ethernet controller in QEMU before 07-20-2020 has a buffer overflow. This     occurs during packet transmission and affects the highbank and midway emulated machines. A guest user or     process could use this flaw to crash the QEMU process on the host, resulting in a denial of service or     potential privileged code execution. This was fixed in commit 5519724a13664b43e225ca05351c60b4468e4555.
    (CVE-2020-15863)

  - An out-of-bounds heap buffer access issue was found in the ARM Generic Interrupt Controller emulator of     QEMU up to and including qemu 4.2.0on aarch64 platform. The issue occurs because while writing an     interrupt ID to the controller memory area, it is not masked to be 4 bits wide. It may lead to the said     issue while updating controller state fields and their subsequent processing. A privileged guest user may     use this flaw to crash the QEMU process on the host resulting in DoS scenario. (CVE-2021-20221)

  - A potential stack overflow via infinite loop issue was found in various NIC emulators of QEMU in versions     up to and including 5.2.0. The issue occurs in loopback mode of a NIC wherein reentrant DMA checks get     bypassed. A guest user/process may use this flaw to consume CPU cycles or crash the QEMU process on the     host resulting in DoS scenario. (CVE-2021-3416)

  - An invalid pointer initialization issue was found in the SLiRP networking implementation of QEMU. The flaw     exists in the bootp_input() function and could occur while processing a udp packet that is smaller than     the size of the 'bootp_t' structure. A malicious guest could use this flaw to leak 10 bytes of     uninitialized heap memory from the host. The highest threat from this vulnerability is to data     confidentiality. This flaw affects libslirp versions prior to 4.6.0. (CVE-2021-3592)

  - An invalid pointer initialization issue was found in the SLiRP networking implementation of QEMU. The flaw     exists in the udp_input() function and could occur while processing a udp packet that is smaller than the     size of the 'udphdr' structure. This issue may lead to out-of-bounds read access or indirect host memory     disclosure to the guest. The highest threat from this vulnerability is to data confidentiality. This flaw     affects libslirp versions prior to 4.6.0. (CVE-2021-3594)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Oracle Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2021-9104 advisory.

    - 9pfs: Fully restart unreclaim loop (CVE-2021-20181) (Greg Kurz)  [Orabug: 32441198]  {CVE-2021-20181}
    - ide: atapi: check logical block address and read size (CVE-2020-29443) (Prasad J Pandit)  [Orabug:
    32393835]  {CVE-2020-29443}
    - Document CVE-2019-20808 as fixed (Mark Kanda)  [Orabug: 32339196]  {CVE-2019-20808}
    - block/iscsi:fix heap-buffer-overflow in iscsi_aio_ioctl_cb (Chen Qun)  [Orabug: 32339207]     {CVE-2020-11947}
    - net: remove an assert call in eth_get_gso_type (Prasad J Pandit)  [Orabug: 32102583]  {CVE-2020-27617}

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of qemu installed on the remote host is prior to 3.1.0-8. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2021-1671 advisory.

    A heap buffer overflow flaw was found in the iSCSI support of QEMU. This flaw could lead to an out-of-     bounds read access and possible information disclosure from the QEMU process memory to a malicious guest.
    The highest threat from this vulnerability is to data confidentiality. (CVE-2020-11947)

    An infinite loop flaw was found in the e1000e NIC emulation code of QEMU. This issue occurs in the     e1000e_write_packet_to_guest() routine while processing bogus RX descriptor data transmitted by the guest.
    This flaw allows a privileged guest user to crash the QEMU process on the host, resulting in a denial of     service. (CVE-2020-25707)

    A reachable assertion vulnerability was found in the USB EHCI emulation code of QEMU. This issue occurs     while processing USB requests due to missed handling of DMA memory map failure. This flaw allows a     malicious privileged user within the guest to send bogus USB requests and crash the QEMU process on the     host, resulting in a denial of service. The highest threat from this vulnerability is to system     availability. (CVE-2020-25723)

    A flaw was found in the memory management API of QEMU during the initialization of a memory region cache.
    This issue could lead to an out-of-bounds write access to the MSI-X table while performing MMIO     operations. A guest user may abuse this flaw to crash the QEMU process on the host, resulting in a denial     of service. (CVE-2020-27821)

    An out-of-bounds access issue was found in the SLiRP user networking implementation of QEMU. It could     occur while processing ARP/NCSI packets, if the packet length was shorter than required to accommodate     respective protocol headers and payload. A privileged guest user may use this flaw to potentially leak     host information bytes. (CVE-2020-29129)

    An out-of-bounds access issue was found in the SLiRP user networking implementation of QEMU. It could     occur while processing ARP/NCSI packets, if the packet length was shorter than required to accommodate     respective protocol headers and payload. A privileged guest user may use this flaw to potentially leak     host information bytes. (CVE-2020-29130)

    An out-of-bounds read-access flaw was found in the ATAPI Emulator of QEMU. This issue occurs while     processing the ATAPI read command if the logical block address(LBA) is set to an invalid value. A guest     user may use this flaw to crash the QEMU process on the host resulting in a denial of service.
    (CVE-2020-29443)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

このqemuの更新では、次の問題が修正されます：

  - virtfsの潜在的な権限昇格を修正しました（CVE-2021-20181 bsc#1182137）

  - iscsiの領域外アクセスを修正しました（CVE-2020-11947 bsc#1180523）

  - vmxnet3エミュレーションの領域外アクセスを修正しました（CVE-2021-20203 bsc#1181639）

  - ARM割り込み処理の領域外アクセスを修正しました（CVE-2021-20221 bsc#1181933）

  - s390上のvfio-pciデバイスがエラー状態になる問題を修正しました（bsc#1179717 bsc#1179719）

  - qemu-guest-agentの更新中に発生する「Failed to try-restart qemu-ga@.service」エラーを修正しました。（bsc#1178565）

  - より適切なステータスコードの使用など、タイムアウトおよびエラー状態に関するqemu scsiパススルーに修正を適用します。これらの問題の追跡に役立つ、qemuトレースを追加します（bsc#1178049）

この更新はSUSEからインポートされました：SLE-15-SP2: 更新プロジェクトを更新します。

リモートのUbuntu 16.04 LTS/18.04 LTS/20.04 LTS/20.10ホストには、USN-4725-1のアドバイザリに記載された複数の脆弱性の影響を受けるパッケージがインストールされています。

  - QEMU 4.1.0のblock/iscsi.cのiscsi_aio_ioctl_cbには、ヒープベースのバッファオーバーリードがあり、プロセスメモリから攻撃者に無関係な情報を漏洩する可能性があります。（CVE-2020-11947）

  - ゲストのOSユーザーがデータのアドレスをe1000eのMMIOアドレスに設定してe1000eパケットをトリガーできるため、QEMU 4.2.0のhw/net/e1000e_core.cにメモリ解放後使用（Use After Free）が見られます。（CVE-2020-15859）

  - メモリ領域キャッシュの初期化中に、QEMUのメモリ管理APIに欠陥が見つかりました。
    この問題により、MMIO 操作の実行中に MSI-X テーブルへの領域外書き込みアクセスが発生する可能性があります。ゲストユーザーがこの欠陥を悪用して、ホスト上で QEMU プロセスをクラッシュさせ、サービス拒否を引き起こす可能性があります。この欠陥は、5.2.0より前の QEMU バージョンに影響を与えます。(CVE-2020-27821)

  - QEMU 5.0.0の hw/net/e1000e_core.c に、NULL バッファアドレスを持つ RX 記述子による無限ループがあります。
    （CVE-2020-28916）

  - QEMU 5.1.0のhw/ide/atapi.cにあるide_atapi_cmd_reply_endでは、バッファインデックスが検証されないため、領域外の読み取りアクセスが可能です。（CVE-2020-29443）

Nessusはこの問題をテストしておらず、代わりにアプリケーションの自己報告されたバージョン番号にのみ依存しています。

qemuのこの更新では、以下の問題を修正します:

sm501 デバイスエミュレーションの OOB アクセスを修正します (CVE-2020-12829、bsc#1172385)

MegaRAID SAS 8708EM2 エミュレーションでの OOB アクセスの可能性を修正しました (CVE-2020-13362 bsc#1172383)

usb xhci パケット処理のメモリ解放後使用 (Use After Free) を修正しました (CVE-2020-25723、bsc#1178934)

usb ehci パケット処理のメモリ解放後使用 (Use After Free) を修正しました (CVE-2020-25084、bsc#1176673)

usb hcd-ohci エミュレーションの OOB アクセスを修正します (CVE-2020-25624、bsc#1176682)

usb hcd-ohci エミュレーションの無限ループ (DoS) を修正します (CVE-2020-25625、bsc#1176684)

共有ネットワーク処理コードでゲストがトリガー可能なアサートを修正します (CVE-2020-27617、bsc#1178174)

e1000e デバイスエミュレーションでの無限ループ (DoS) を修正します (CVE-2020-28916、bsc#1179468)

atapi エミュレーションの OOB アクセスを修正します (CVE-2020-29443、bsc#1181108)

NULL ポインターデリファレンスを修正します。(DoS) mmio ops (CVE-2020-15469、bsc#1173612)

e1000 デバイスエミュレーションの無限ループ (DoS) を修正します (CVE-2021-20257、bsc#1182577)

rtl8139 NIC エミュレーションの OOB アクセス (スタックオーバーフロー) を修正します (CVE-2021-3416、bsc#1182968)

その他の NIC エミュレーションの OOB アクセス (スタックオーバーフロー) を修正します (CVE-2021-3416)

SLIRP ARP パケット処理の OOB アクセスを修正します (CVE-2020-29130、bsc#1179467)

MegaRAID SAS 8708EM2 エミュレーションの NULL ポインターデリファレンスの可能性 (DoS) を修正します (CVE-2020-13659 bsc#1172386

iscsi の OOB アクセスを修正します (CVE-2020-11947 bsc#1180523)

vmxnet3 エミュレーションの OOB アクセスを修正します (CVE-2021-20203 bsc#1181639)

XGMAC デバイスのバッファオーバーフローを修正します (CVE-2020-15863、bsc#1174386)

さまざまなエミュレートされた NIC のパケット処理における DoS を修正します (CVE-2020-16092 bsc#1174641)

USB パケットの処理中に OOB アクセスを修正します (CVE-2020-14364 bsc#1175441)

パッケージスクリプトを修正し、一時作業ディレクトリおよびログファイルにハードコードされたパスを使用しないようにします (bsc#1182425)

virtfs の潜在的な権限昇格を修正します (CVE-2021-20181 bsc#1182137)

ES1370オーディオデバイスエミュレーションで発生する可能性のあるOOBアクセスを修正しました (CVE-2020-13361 bsc#1172384)。

ROM ロード中の OOB アクセスを修正します (CVE-2020-13765 bsc#1172478)

注: Tenable Network Security は、前述の記述ブロックを SUSE セキュリティアドバイザリから直接抽出しています。Tenable では、そこに新しい問題を追加することはせずに、できる限り自動的に整理と書式設定をするようにしています。

qemuのこの更新では、以下の問題を修正します:

sm501 デバイスエミュレーションの OOB アクセスを修正します (CVE-2020-12829、bsc#1172385)

MegaRAID SAS 8708EM2 エミュレーションでの OOB アクセスの可能性を修正しました (CVE-2020-13362 bsc#1172383)

usb xhci パケット処理のメモリ解放後使用 (Use After Free) を修正しました (CVE-2020-25723、bsc#1178934)

usb ehci パケット処理のメモリ解放後使用 (Use After Free) を修正しました (CVE-2020-25084、bsc#1176673)

usb hcd-ohci エミュレーションの OOB アクセスを修正します (CVE-2020-25624、bsc#1176682)

usb hcd-ohci エミュレーションの無限ループ (DoS) を修正します (CVE-2020-25625、bsc#1176684)

共有ネットワーク処理コードでゲストがトリガー可能なアサートを修正します (CVE-2020-27617、bsc#1178174)

e1000e デバイスエミュレーションでの無限ループ (DoS) を修正します (CVE-2020-28916、bsc#1179468)

atapi エミュレーションの OOB アクセスを修正します (CVE-2020-29443、bsc#1181108)

MSIx エミュレーションのヒープオーバーフロー (CVE-2020-27821、bsc#1179686)

NULL ポインターデリファレンスを修正します。(DoS) mmio ops (CVE-2020-15469、bsc#1173612)

e1000 デバイスエミュレーションの無限ループ (DoS) を修正します (CVE-2021-20257、bsc#1182577)

rtl8139 NIC エミュレーションの OOB アクセス (スタックオーバーフロー) を修正します (CVE-2021-3416、bsc#1182968)

その他の NIC エミュレーションの OOB アクセス (スタックオーバーフロー) を修正します (CVE-2021-3416)

SLIRP ARP/NCSI パケット処理の OOB アクセスを修正します (CVE-2020-29129、bsc#1179466、CVE-2020-29130、bsc#1179467)

MegaRAID SAS 8708EM2 エミュレーションの NULL ポインターデリファレンスの可能性 (DoS) を修正します (CVE-2020-13659 bsc#1172386)

s390 ゲストが zipl 起動メニューインデックスの検索に失敗する問題を修正します (bsc#1183979)

iscsi の OOB アクセスを修正します (CVE-2020-11947 bsc#1180523)

vmxnet3 エミュレーションの OOB アクセスを修正します (CVE-2021-20203 bsc#1181639)

パッケージスクリプトを修正し、一時作業ディレクトリおよびログファイルにハードコードされたパスを使用しないようにします (bsc#1182425)

virtfs の潜在的な権限昇格を修正します (CVE-2021-20181 bsc#1182137)

より適切なステータスコードの使用など、タイムアウトおよびエラー状態に関する qemu scsi パススルーに修正を適用します。(bsc#1178049)

ARM 割り込み処理の OOB アクセスを修正します (CVE-2021-20221 bsc#1181933)

フォーマットを改善するためにスペックファイルを調整し、e2fsprogs-devel および libpcap-devel の不要な BuildRequires を削除します

ES1370オーディオデバイスエミュレーションで発生する可能性のあるOOBアクセスを修正しました (CVE-2020-13361 bsc#1172384)。

ROM ロード中の OOB アクセスを修正します (CVE-2020-13765 bsc#1172478)

USB パケットの処理中に OOB アクセスを修正します (CVE-2020-14364 bsc#1175441)

さまざまなエミュレートされた NIC のパケット処理における DoS を修正します (CVE-2020-16092 bsc#1174641)

XGMAC デバイスのバッファオーバーフローを修正します (CVE-2020-15863 bsc#1174386)

「％service_del_postun」の代わりに「％service_del_postun_without_restart」を使用して、qemu-guest-agent の更新中の「Failed to try-restart qemu-ga@.service」エラーを回避します。
(bsc#1178565)

注意:Tenable Network Securityは、前述の記述ブロックをSUSEセキュリティアドバイザリから直接抽出しています。Tenable では、そこに新しい問題を追加することはせずに、できる限り自動的に整理と書式設定をするようにしています。

リモートのAlmaLinux 8ホストには、ALSA-2021:1762アドバイザリに記載されているとおり、複数の脆弱性の影響を受けるパッケージがインストールされています。

    * libvirtqemu_agent.c の qemuAgentGetInterfaces() の二重解放CVE-2020-25637]

    * QEMUhw/pci/msix.c の msix_table_mmio_write() でのヒープバッファオーバーフローCVE-2020-27821]

    * QEMUide: atapi読み取りコマンドの処理中の OOB アクセスCVE-2020-29443

    * QEMUblock/iscsi.c の iscsi_aio_ioctl_cb() のヒープバッファオーバーフローにより、情報漏洩が発生する可能性がありますCVE-2020-11947

    * QEMUhw/net/net_tx_pkt.c の net_tx_pkt_add_raw_fragment() で到達可能なアサーションエラーCVE-2020-16092

    * QEMUhw/net/e1000e_core.c の e1000e_write_packet_to_guest() の無限ループCVE-2020-25707

    * QEMUhw/usb/hcd-ehci.c での usb_packet_unmap() を通じたアサーション失敗CVE-2020-25723

    * QEMUe1000enull パケット記述子の場合の無限ループシナリオCVE-2020-28916

    * QEMUslirpARP/NCSI パケットの処理中の領域外アクセスCVE-2020-29129、 CVE-2020-29130

Tenableは、前述の記述ブロックをAlmaLinuxセキュリティアドバイザリから直接抽出しています。

Nessus はこれらの問題をテストしておらず、代わりにアプリケーションが自己報告するバージョン番号にのみ依存していることに注意してください。

ID	名稱	產品	系列	已發布	已更新	嚴重性
148544	Oracle Linux 7：qemu（ELSA-2021-9104）	Nessus	Oracle Linux Local Security Checks	2021/4/14	2024/11/1	high
150965	Amazon Linux 2：qemu（ALAS-2021-1671）	Nessus	Amazon Linux Local Security Checks	2021/6/23	2024/12/11	medium
184965	Rocky Linux 8 : virt:rhel and virt-devel:rhel (RLSA-2021:1762)	Nessus	Rocky Linux Local Security Checks	2023/11/7	2023/11/7	medium
236436	Alibaba Cloud Linux 3 : 0119: virt:rhel and virt-devel:rhel (ALINUX3-SA-2022:0119)	Nessus	Alibaba Cloud Linux Local Security Checks	2025/5/14	2025/5/15	critical
148966	SUSE SLES12 Security Update : qemu (SUSE-SU-2021:1305-1)	Nessus	SuSE Local Security Checks	2021/4/23	2024/1/3	high
152199	SUSE SLES11 Security Update : kvm (SUSE-SU-2021:14772-1)	Nessus	SuSE Local Security Checks	2021/8/4	2023/7/13	medium
148544	Oracle Linux 7 : qemu (ELSA-2021-9104)	Nessus	Oracle Linux Local Security Checks	2021/4/14	2024/11/1	high
150965	Amazon Linux 2 : qemu (ALAS-2021-1671)	Nessus	Amazon Linux Local Security Checks	2021/6/23	2024/12/11	medium
146938	openSUSEセキュリティ更新プログラム：qemu（openSUSE-2021-363）	Nessus	SuSE Local Security Checks	2021/3/2	2024/1/18	high
146303	Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS : QEMU の脆弱性 (USN-4725-1)	Nessus	Ubuntu Local Security Checks	2021/2/8	2025/9/3	high
148758	SUSE SLES12セキュリティ更新プログラム: qemu(SUSE-SU-2021:1240-1)	Nessus	SuSE Local Security Checks	2021/4/19	2024/1/3	high
148752	SUSE SLES15セキュリティ更新プログラム: qemu(SUSE-SU-2021:1245-1)	Nessus	SuSE Local Security Checks	2021/4/19	2024/1/4	high
157696	AlmaLinux 8virt:rhel および virt-devel:rhelALSA-2021:1762	Nessus	Alma Linux Local Security Checks	2022/2/9	2025/9/23	medium

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