According to the versions of the kernel packages installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities :

  - A vulnerability was found in Linux kernel. There is an     information leak in file 'sound/core/timer.c' of the     latest mainline Linux kernel, the stack object     aEURoetreadaEUR has a total size of 32 bytes. It contains a     8-bytes padding, which is not initialized but sent to     user via copy_to_user(), resulting a kernel     leak.(CVE-2016-4569)

  - A vulnerability was found in Linux kernel. There is an     information leak in file sound/core/timer.c of the     latest mainline Linux kernel. The stack object aEURoer1aEUR     has a total size of 32 bytes. Its field aEURoeeventaEUR and     aEURoevalaEUR both contain 4 bytes padding. These 8 bytes     padding bytes are sent to user without being     initialized.(CVE-2016-4578)

  - The x25_negotiate_facilities function in     net/x25/x25_facilities.c in the Linux kernel before     4.5.5 does not properly initialize a certain data     structure, which allows attackers to obtain sensitive     information from kernel stack memory via an X.25 Call     Request.(CVE-2016-4580)

  - fs/pnode.c in the Linux kernel before 4.5.4 does not     properly traverse a mount propagation tree in a certain     case involving a slave mount, which allows local users     to cause a denial of service (NULL pointer dereference     and OOPS) via a crafted series of mount system     calls.(CVE-2016-4581)

  - Use after free vulnerability was found in percpu using     previously allocated memory in bpf. First
    __alloc_percpu_gfp() is called, then the memory is     freed with free_percpu() which triggers async     pcpu_balance_work and then pcpu_extend_area_map could     use a chunk after it has been freed.(CVE-2016-4794)

  - Use-after-free vulnerability in     drivers/net/ppp/ppp_generic.c in the Linux kernel     before 4.5.2 allows local users to cause a denial of     service (memory corruption and system crash, or     spinlock) or possibly have unspecified other impact by     removing a network namespace, related to the     ppp_register_net_channel and ppp_unregister_channel     functions.(CVE-2016-4805)

  - A vulnerability was found in the Linux kernel. Payloads     of NM entries are not supposed to contain NUL. When     such entry is processed, only the part prior to the     first NUL goes into the concatenation (i.e. the     directory entry name being encoded by a bunch of NM     entries). The process stops when the amount collected     so far + the claimed amount in the current NM entry     exceed 254. However, the value returned as the total     length is the sum of *claimed* sizes, not the actual     amount collected. And that's what will be passed to     readdir() callback as the name length - 8Kb
    __copy_to_user() from a buffer allocated by
    __get_free_page().(CVE-2016-4913)

  - A flaw was discovered in processing setsockopt for 32     bit processes on 64 bit systems. This flaw will allow     attackers to alter arbitrary kernel memory when     unloading a kernel module. This action is usually     restricted to root-privileged users but can also be     leveraged if the kernel is compiled with CONFIG_USER_NS     and CONFIG_NET_NS and the user is granted elevated     privileges.(CVE-2016-4997)

  - An out-of-bounds heap memory access leading to a Denial     of Service, heap disclosure, or further impact was     found in setsockopt(). The function call is normally     restricted to root, however some processes with     cap_sys_admin may also be able to trigger this flaw in     privileged container environments.(CVE-2016-4998)

  - A race condition was found in the way the Linux     kernel's memory subsystem handled the copy-on-write     (COW) breakage of private read-only memory mappings. An     unprivileged, local user could use this flaw to gain     write access to otherwise read-only memory mappings and     thus increase their privileges on the     system.(CVE-2016-5195)

  - It was found that the RFC 5961 challenge ACK rate     limiting as implemented in the Linux kernel's     networking subsystem allowed an off-path attacker to     leak certain information about a given connection by     creating congestion on the global challenge ACK rate     limit counter and then measuring the changes by probing     packets. An off-path attacker could use this flaw to     either terminate TCP connection and/or inject payload     into non-secured TCP connection between two endpoints     on the network.(CVE-2016-5696)

  - A heap-based buffer overflow vulnerability was found in     the Linux kernel's hiddev driver. This flaw could allow     a local attacker to corrupt kernel memory, possible     privilege escalation or crashing the     system.(CVE-2016-5829)

  - When creating audit records for parameters to executed     children processes, an attacker can convince the Linux     kernel audit subsystem can create corrupt records which     may allow an attacker to misrepresent or evade logging     of executing commands.(CVE-2016-6136)

  - It was found that the unlink and rename functionality     in overlayfs did not verify the upper dentry for     staleness. A local, unprivileged user could use the     rename syscall on overlayfs on top of xfs to panic or     crash the system.(CVE-2016-6197)

  - A flaw was found that the vfs_rename() function did not     detect hard links on overlayfs. A local, unprivileged     user could use the rename syscall on overlayfs on top     of xfs to crash the system.(CVE-2016-6198)

  - System using the infiniband support module ib_srpt were     vulnerable to a denial of service by system crash by a     local attacker who is able to abort writes to a device     using this initiator.(CVE-2016-6327)

  - A race condition flaw was found in the ioctl_send_fib()     function in the Linux kernel's aacraid implementation.
    A local attacker could use this flaw to cause a denial     of service (out-of-bounds access or system crash) by     changing a certain size value.(CVE-2016-6480)

  - kernel/events/core.c in the performance subsystem in     the Linux kernel before 4.0 mismanages locks during     certain migrations, which allows local users to gain     privileges via a crafted application, aka Android     internal bug 30955111.(CVE-2016-6786)

  - kernel/events/core.c in the performance subsystem in     the Linux kernel before 4.0 mismanages locks during     certain migrations, which allows local users to gain     privileges via a crafted application, aka Android     internal bug 31095224.(CVE-2016-6787)

  - A use-after-free vulnerability was found in     tcp_xmit_retransmit_queue and other tcp_* functions.
    This condition could allow an attacker to send an     incorrect selective acknowledgment to existing     connections, possibly resetting a     connection.(CVE-2016-6828)

  - Linux kernel built with the 802.1Q/802.1ad     VLAN(CONFIG_VLAN_8021Q) OR Virtual eXtensible Local     Area Network(CONFIG_VXLAN) with Transparent Ethernet     Bridging(TEB) GRO support, is vulnerable to a stack     overflow issue. It could occur while receiving large     packets via GRO path, as an unlimited recursion could     unfold in both VLAN and TEB modules, leading to a stack     corruption in the kernel.(CVE-2016-7039)

  - It was found that when the gcc stack protector was     enabled, reading the /proc/keys file could cause a     panic in the Linux kernel due to stack corruption. This     happened because an incorrect buffer size was used to     hold a 64-bit timeout value rendered as     weeks.(CVE-2016-7042)

  - It was found that when file permissions were modified     via chmod and the user modifying them was not in the     owning group or capable of CAP_FSETID, the setgid bit     would be cleared. Setting a POSIX ACL via setxattr sets     the file permissions as well as the new ACL, but     doesn't clear the setgid bit in a similar way. This     could allow a local user to gain group privileges via     certain setgid applications.(CVE-2016-7097)

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

Linux カーネルに、権限昇格、サービス拒否、またはその他の影響をもたらす可能性がある、いくつかの脆弱性が発見されました。CVE-2014-9888 : Russell King 氏は、ARM システムでは、DMA バッファに割り当てられたメモリが実行権限によってマップされていることを発見しました。これにより、カーネルの他の脆弱性を悪用しやすくなります。CVE-2014-9895 : Dan Carpenter 氏は、メディアデバイスの MEDIA_IOC_ENUM_LINKS ioctl によって情報漏洩が発生したことを発見しました。CVE-2016-6786 / CVE-2016-6787 : 特定の移行中にパフォーマンスイベントサブシステムが適切にロックを管理せず、ローカルの攻撃者が権限を昇格できることが判明されました。これは、パフォーマンスイベントの権限のない使用を無効にすることで軽減できます : sysctl kernel.perf_event_paranoid=3。CVE-2016-8405 : Trend Micro の Peter Pi 氏は、カラーマップをユーザー空間にコピーする際に、フレームバッファービデオサブシステムが適切に境界をチェックせず、ヒープバッファーの領域外読み込みが発生し、情報開示につながることを発見しました。CVE-2017-5549 : KLSI KL5KUSB105 シリアル USB デバイスドライバーが初期化されていないカーネルメモリの内容を記録し、情報漏洩を引き起こす可能性があることが発見されました。CVE-2017-6001 : Di Shen 氏は、パフォーマンスイベントサブシステムへの同時呼び出し間の競合状態により、ローカルの攻撃者が権限を昇格させる可能性があることを発見しました。この問題は、CVE-2016-6786 の修正が不完全なために存在します。これは、パフォーマンスイベントの権限のない使用を無効にすることで軽減できます : sysctl kernel.perf_event_paranoid=3。CVE-2017-6074 : Andrey Konovalov 氏は、DCCP ネットワーキングコードで、サービス拒否またはローカルの権限昇格を引き起こす use-after-free の脆弱性を発見しました。dccp モジュールがまだロードされていないシステムでは、これを無効にすることで緩和できます : echo >> /etc/modprobe.d/disable-dccp.conf インストール dccp false Debian 7 'Wheezy' では、これらの問題はバージョン 3.2.84-2 で修正されています。Debian 8 'Jessie' では、これらの問題はバージョン 3.16.39-1+deb8u1 以前で修正されています。お使いの linux パッケージをアップグレードすることを推奨します。注 : Tenable Network Security は、前述の記述ブロックを DLA 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、新たな問題を持ち込まずに、できる限り自動的に整理して書式設定するようにしています。

Linux カーネルに、権限昇格、サービス拒否、またはその他の影響をもたらす可能性がある、いくつかの脆弱性が発見されました。- CVE-2016-6786 / CVE-2016-6787     特定の移行中にパフォーマンスイベントサブシステムが     適切にロックを管理せず、     ローカルの攻撃者が権限を昇格できることが     判明されました。これは、パフォーマンスイベントの権限のない使用を     無効にすることで軽減できます : events:sysctl     kernel.perf_event_paranoid=3 - CVE-2016-8405     Trend Micro の Peter Pi 氏は、カラーマップをユーザー空間に     コピーする際に、フレームバッファービデオサブシステムが     適切に境界をチェックせず、ヒープバッファーの領域外読み込みが発生し、     情報開示につながることを発見しました。- CVE-2016-9191     CAI Qian 氏は、sysctl 実装の proc_sys_readdir 内で     参照カウントが適切に実行されなかったことを発見しました。     これにより、ローカルのサービス拒否 (システムのハングアップ) を引き起こしたり、     権限昇格が発生する可能性があります。- CVE-2017-2583     Xiaohan Zhang 氏は、KVM for amd64 が     null スタックセレクターの読み込みを正しくエミュレートしないことを報告しました。これは、     ゲスト VM のユーザーによって使用され、     サービス拒否 (Intel CPU) または VM 内での権限昇格 (AMD CPU) を     引き起こす可能性があります。- CVE-2017-2584     Dmitry Vyukov 氏は、KVM for x86 が SGDT および SIDT 命令による     メモリアクセスを正しくエミュレートしないことを報告しました。     これにより use-after-free および情報漏洩が発生する     可能性があります。- CVE-2017-2596     Dmitry Vyukov 氏は、ネスト化ハイパーバイザーに対して VMON を     エミュレートするときのページ参照漏洩を報告しました。これは、     ゲスト VM の権限のあるユーザーによって使用され、     サービス拒否が引き起こされたり、ホストで権限が取得される可能性があります。- CVE-2017-2618     /proc/pid/attr の SELinux 属性の処理時の off-by-one により、     ローカルのサービス拒否が発生する可能性が     あることが判明されました。- CVE-2017-5549     KLSI KL5KUSB105 シリアル USB デバイスドライバーが     初期化されていないカーネルメモリの内容を記録し、     情報漏洩を引き起こす可能性があることが発見されました。- CVE-2017-5551     Jan Kara 氏が、tmpfs でファイルの POSIX ACL を変更しても     ファイルの set-group-ID フラグがクリアされないことを発見しました。     これは変更するユーザーが group-owner のメンバーではない場合に     実行する必要があります。場合によっては、これにより     実行可能ファイルの user-owner が group-owner の権限を取得する可能性が     あります。- CVE-2017-5897     Andrey Konovalov 氏は、IPv6 ネットワーキングコードの ip6gre_err 関数の     領域外読み取りの欠陥を発見しました。- CVE-2017-5970     Andrey Konovalov 氏は、IPv4 ネットワーキングコードの     サービス拒否の欠陥を発見しました。これは、ローカル UDP または raw ソケットの IP_RETOPTS オプションが有効な場合、     ローカルまたはリモートの攻撃者によって     トリガーされます。- CVE-2017-6001     Di Shen 氏は、パフォーマンスイベントサブシステムへの     同時呼び出し間の競合状態により、ローカルの攻撃者が     権限を昇格させる可能性があることを発見しましたこの問題は、     この問題は、CVE-2016-6786 の修正が不完全なために存在します。これは、     パフォーマンスイベントの権限のない使用を     無効にすることで軽減できます : sysctl kernel.perf_event_paranoid=3 - CVE-2017-6074     Andrey Konovalov 氏は、DCCP ネットワーキングコードで、     サービス拒否またはローカルの権限昇格を引き起こす     use-after-free の脆弱性を     発見しました。dccp モジュールがまだロードされていないシステムでは、     これは、以下を無効にすることで緩和できます:     it:echo >> /etc/modprobe.d/disable-dccp.conf インストール     dccp false

在 Linux 核心中發現數個弱點，這些弱點可能會導致權限提升、拒絕服務或造成其他影響。- CVE-2016-6786 / CVE-2016-6787 發現效能事件子系統在特定移轉期間並未正確管理鎖定項，造成本機攻擊者可藉此提升權限。此問題可藉由停用無權限使用效能事件來降低其安全性風險：sysctl kernel.perf_event_paranoid=3 - CVE-2016-8405 Trend Micro 的 Peter Pi 發現影格緩衝區視訊子系統在將顏色對應表複製到使用者空間時，並未正確檢查邊界，造成發生堆積緩衝區超出邊界讀取，進而導致資訊洩漏。- CVE-2016-9191 CAI Qian 發現在 sysctl 實作的 proc_sys_readdir 中未正確處理參照計數，會造成本機拒絕服務 (系統懸置) 或可能導致權限提升。- CVE-2017-2583 Xiaohan Zhang 報告 arm64 的 KVM 未正確模擬載入 null 堆疊選擇器。客戶機 VM 中的使用者可利用此問題，造成拒絕服務 (Intel CPU) 或在 VM 中提升權限 (AMD CPU)。- CVE-2017-2584 Dmitry Vyukov 報告 x86 的 KVM 未正確模擬 SGDT 和 SIDT 指令存取記憶體，會造成釋放後使用錯誤和資訊洩漏。- CVE-2017-2596 Dmitry Vyukov 報告 KVM 在進行巢狀 hypervisor 的 VMON 模擬時會洩漏頁面參照。客戶機 VM 中有權限的使用者可利用此問題，造成拒絕服務或有可能在主機中取得權限。- CVE-2017-2618 發現 /proc/pid/attr 中的 SELinux 屬性處理方式存在差一錯誤，會造成本機拒絕服務。- CVE-2017-5549 發現 KLSI KL5KUSB105 序列 USB 裝置驅動程式會記錄未初始化的核心記憶體內容，造成資訊洩漏。- CVE-2017-5551 Jan Kara 發現在 tmpfs 上變更檔案的 POSIX ACL 從未清除檔案的 set-group-ID 旗標，如果執行變更的使用者並非群組擁有者成員，旗標本應清除。有時候這會造成擁有可執行檔的使用者可藉此取得群組擁有者的權限。- CVE-2017-5897 Andrey Konovalov 發現 IPv6 網路程式碼中的 ip6gre_err 函式存在一個超出邊界讀取缺陷。- CVE-2017-5970 Andrey Konovalov 發現 IPv4 網路程式碼中存在一個拒絕服務缺陷。如果本機 UDP 或原始通訊端有啟用 IP_RETOPTS 選項，本機或遠端的攻擊者皆可觸發此缺陷。- CVE-2017-6001 Di Shen 發現對效能事件子系統的並行呼叫間存在爭用情形，本機攻擊者可藉此提升權限。此缺陷是因為 CVE-2016-6786 的修正不完整所造成的。此問題可藉由停用無權限使用效能事件來降低其安全性風險：sysctl kernel.perf_event_paranoid=3 - CVE-2017-6074 Andrey Konovalov 發現 DCCP 網路程式碼存在一個釋放後使用弱點，會造成拒絕服務或本機權限提升。在尚未載入 dccp 模組的系統上，可採用下列方式停用該模組以降低安全風險：echo >> /etc/modprobe.d/disable-dccp.conf install dccp false

在 Linux 内核中发现多个可能导致权限升级、拒绝服务或造成其他影响的漏洞。- CVE-2016-6786 / CVE-2016-6787 已发现性能事件子系统在某些迁移期间无法正确管理锁，从而允许本地攻击者升级权限。此问题可以通过禁用性能事件的非特权使用来缓解：sysctl kernel.perf_event_paranoid = 3 - CVE-2016-8405 Trend Micro 的 Peter Pi 发现，在将颜色映射复制到用户空间时，帧缓冲区视频子系统未正确检查边界，导致堆缓冲区越界读取，从而造成信息泄露。- CVE-2016-9191 CAI Qian 发现 sysctl 实现的 proc_sys_readdir 中未正确处理引用计数，从而导致本地拒绝服务（系统挂起）或可能导致权限升级。- CVE-2017-2583 Xiaohan Zhang 报告用于 amd64 的 KVM 无法正确仿真空堆栈选择器的加载。客户机 VM 中的用户可利用此问题拒绝服务（在 Intel CPU 上）或提升 VM 中的特权（在 AMD CPU 上）。- CVE-2017-2584 Dmitry Vyukov 报告用于 x86 的 KVM 未正确仿真 SGDT 和 SIDT 指令进行的内存访问，可能导致释放后使用和信息泄露。- CVE-2017-2596 Dmitry Vyukov 报告 KVM 在仿真嵌套管理程序的 VMON 时泄露页面引用。客户机 VM 中的特权用户可利用此问题拒绝服务，或者可能获取主机中的特权。- CVE-2017-2618 已发现处理 /proc/pid/attr 中的 SELinux 属性时的一个差一错误可能导致本地拒绝服务。- CVE-2017-5549 已发现 KLSI KL5KUSB105 串行 USB 设备驱动程序可记录未初始化内核内存内容，从而造成信息泄露。- CVE-2017-5551 Jan Kara 发现更改 tmpfs 上文件的 POSIX ACL 不会清除其 set-group-ID 标志，但在更改文件的用户不是群组所有者的成员时本应清除此标志。在某些情况下，这会允许可执行文件的用户所有者获得群组所有者的权限。- CVE-2017-5897 Andrey Konovalov 在 IPv6 网络代码的 ip6gre_err 函数中发现一个越界读取缺陷。- CVE-2017-5970 Andrey Konovalov 在 IPv4 网络代码中发现一个拒绝服务缺陷。如果本地 UDP 或原始套接字启用了 IP_RETOPTS 选项，则本地或远程攻击者可能触发此问题。- CVE-2017-6001 Di Shen 发现并发调用性能事件子系统之间存在争用条件，可允许本地攻击者升级权限。存在此缺陷的原因是 CVE-2016-6786 的修复不完整。此问题可通过禁用性能事件的非特权使用来缓解：sysctl kernel.perf_event_paranoid = 3 - CVE-2017-6074 Andrey Konovalov 在 DCCP 网络代码中发现一个释放后使用漏洞，可导致拒绝服务或本地权限升级。在尚未加载 dccp 模块的系统上，此问题可通过禁用此模块来缓解：echo >> /etc/modprobe.d/disable-dccp.conf install dccp false

Several vulnerabilities have been discovered in the Linux kernel that may lead to a privilege escalation, denial of service or have other impacts.

  - CVE-2016-6786 / CVE-2016-6787     It was discovered that the performance events subsystem     does not properly manage locks during certain     migrations, allowing a local attacker to escalate     privileges. This can be mitigated by disabling     unprivileged use of performance events:sysctl     kernel.perf_event_paranoid=3

  - CVE-2016-8405     Peter Pi of Trend Micro discovered that the frame buffer     video subsystem does not properly check bounds while     copying color maps to userspace, causing a heap buffer     out-of-bounds read, leading to information disclosure.

  - CVE-2016-9191     CAI Qian discovered that reference counting is not     properly handled within proc_sys_readdir in the sysctl     implementation, allowing a local denial of service     (system hang) or possibly privilege escalation.

  - CVE-2017-2583     Xiaohan Zhang reported that KVM for amd64 does not     correctly emulate loading of a null stack selector. This     can be used by a user in a guest VM for denial of     service (on an Intel CPU) or to escalate privileges     within the VM (on an AMD CPU).

  - CVE-2017-2584     Dmitry Vyukov reported that KVM for x86 does not     correctly emulate memory access by the SGDT and SIDT     instructions, which can result in a use-after-free and     information leak.

  - CVE-2017-2596     Dmitry Vyukov reported that KVM leaks page references     when emulating a VMON for a nested hypervisor. This can     be used by a privileged user in a guest VM for denial of     service or possibly to gain privileges in the host.

  - CVE-2017-2618     It was discovered that an off-by-one in the handling of     SELinux attributes in /proc/pid/attr could result in     local denial of service.

  - CVE-2017-5549     It was discovered that the KLSI KL5KUSB105 serial USB     device driver could log the contents of uninitialised     kernel memory, resulting in an information leak.

  - CVE-2017-5551     Jan Kara found that changing the POSIX ACL of a file on     tmpfs never cleared its set-group-ID flag, which should     be done if the user changing it is not a member of the     group-owner. In some cases, this would allow the     user-owner of an executable to gain the privileges of     the group-owner.

  - CVE-2017-5897     Andrey Konovalov discovered an out-of-bounds read flaw     in the ip6gre_err function in the IPv6 networking code.

  - CVE-2017-5970     Andrey Konovalov discovered a denial-of-service flaw in     the IPv4 networking code. This can be triggered by a     local or remote attacker if a local UDP or raw socket     has the IP_RETOPTS option enabled.

  - CVE-2017-6001     Di Shen discovered a race condition between concurrent     calls to the performance events subsystem, allowing a     local attacker to escalate privileges. This flaw exists     because of an incomplete fix of CVE-2016-6786. This can     be mitigated by disabling unprivileged use of     performance events: sysctl kernel.perf_event_paranoid=3

  - CVE-2017-6074     Andrey Konovalov discovered a use-after-free     vulnerability in the DCCP networking code, which could     result in denial of service or local privilege     escalation. On systems that do not already have the dccp     module loaded, this can be mitigated by disabling     it:echo >> /etc/modprobe.d/disable-dccp.conf install     dccp false

在 Linux 核心中發現數個弱點，這些弱點可能會導致權限提升、拒絕服務或造成其他影響。CVE-2014-9888 Russell King 發現 ARM 系統上配置給 DMA 緩衝區的記憶體，是以可執行檔權限進行對應。這會造成核心中其他弱點更容易遭到惡意利用。CVE-2014-9895 Dan Carpenter 發現媒體裝置上的 MEDIA_IOC_ENUM_LINKS ioctl 會造成資訊洩漏。CVE-2016-6786 / CVE-2016-6787 發現效能事件子系統在特定移轉期間並未正確管理鎖定項，造成本機攻擊者可藉此提升權限。此問題可藉由停用無權限使用效能事件來降低其安全性風險：sysctl kernel.perf_event_paranoid=3 CVE-2016-8405 Trend Micro 的 Peter Pi 發現框架緩衝區視訊子系統在將顏色對應表複製到使用者空間時，並未正確檢查邊界，造成發生堆積緩衝區超出邊界讀取，進而導致資訊洩漏。CVE-2017-5549 發現 KLSI KL5KUSB105 序列 USB 裝置驅動程式會記錄未初始化的核心記憶體內容，造成資訊洩漏。CVE-2017-6001 Di Shen 發現對效能事件子系統的並行呼叫間存在爭用情形，本機攻擊者可藉此提升權限。此缺陷是因為 CVE-2016-6786 的修正不完整所造成的。此問題可藉由停用無權限使用效能事件來降低其安全性風險：sysctl kernel.perf_event_paranoid=3 CVE-2017-6074 Andrey Konovalov 發現 DCCP 網路程式碼存在一個釋放後使用弱點，會造成拒絕服務或本機權限提升。在尚未載入 dccp 模組的系統上，可採用下列方式停用該模組以降低安全風險：echo >> /etc/modprobe.d/disable-dccp.conf install dccp false 針對 Debian 7「Wheezy」，這些問題已在 3.2.84-2 版本中修正。針對 Debian 8「Jessie」，這些問題已在 3.16.39-1+deb8u1 或更舊版本中修正。建議您升級 linux 套件。注意：Tenable Network Security 已直接從 DLA 安全性公告擷取前置描述區塊。Tenable 已盡量在不造成其他問題的前提下，嘗試自動清理並將其格式化。

According to the versions of the kernel packages installed, the EulerOS Virtualization for ARM 64 installation on the remote host is affected by the following vulnerabilities :

  - The pagemap_open function in fs/proc/task_mmu.c in the     Linux kernel before 3.19.3, as used in Android 6.0.1     before 2016-03-01, allows local users to obtain     sensitive physical-address information by reading a     pagemap file, aka Android internal bug     25739721.(CVE-2016-0823i1/4%0

  - drivers/hid/hid-steelseries.c in the Human Interface     Device (HID) subsystem in the Linux kernel through     3.11, when CONFIG_HID_STEELSERIES is enabled, allows     physically proximate attackers to cause a denial of     service (heap-based out-of-bounds write) via a crafted     device.(CVE-2013-2891i1/4%0

  - The overlayfs implementation in the Linux kernel     through 4.5.2 does not properly maintain POSIX ACL     xattr data, which allows local users to gain privileges     by leveraging a group-writable setgid     directory.(CVE-2016-1575i1/4%0

  - Integer overflow in the vc4_get_bcl function in     drivers/gpu/drm/vc4/vc4_gem.c in the VideoCore DRM     driver in the Linux kernel before 4.9.7 allows local     users to cause a denial of service or possibly have     unspecified other impact via a crafted size value in a     VC4_SUBMIT_CL ioctl call.(CVE-2017-5576i1/4%0

  - The KVM subsystem in the Linux kernel through 3.12.5     allows local users to gain privileges or cause a denial     of service (system crash) via a VAPIC synchronization     operation involving a page-end     address.(CVE-2013-6368i1/4%0

  - It was found that the code in net/sctp/socket.c in the     Linux kernel through 4.10.1 does not properly restrict     association peel-off operations during certain wait     states, which allows local users to cause a denial of     service (invalid unlock and double free) via a     multithreaded application. This vulnerability was     introduced by CVE-2017-5986 fix (commit     2dcab5984841).(CVE-2017-6353i1/4%0

  - net/netfilter/nf_conntrack_proto_dccp.c in the Linux     kernel through 3.13.6 uses a DCCP header pointer     incorrectly, which allows remote attackers to cause a     denial of service (system crash) or possibly execute     arbitrary code via a DCCP packet that triggers a call     to the (1) dccp_new, (2) dccp_packet, or (3) dccp_error     function.(CVE-2014-2523i1/4%0

  - Race condition vulnerability was found in     drivers/misc/mic/vop/vop_vringh.c in the MIC VOP driver     in the Linux kernel before 4.6.1. MIC VOP driver does     two successive reads from user space to read a variable     length data structure. Local user can obtain sensitive     information from kernel memory or can cause DoS by     corrupting kernel memory if the data structure changes     between the two reads.(CVE-2016-5728i1/4%0

  - An issue was discovered in the btrfs filesystem code in     the Linux kernel. An invalid pointer dereference in     io_ctl_map_page() when mounting and operating a crafted     btrfs image is due to a lack of block group item     validation in check_leaf_item() in     fs/btrfs/tree-checker.c function. This could lead to a     system crash and a denial of service.(CVE-2018-14613i1/4%0

  - A flaw was found in the way the Linux kernel handled GS     segment register base switching when recovering from a     #SS (stack segment) fault on an erroneous return to     user space. A local, unprivileged user could use this     flaw to escalate their privileges on the     system.(CVE-2014-9322i1/4%0

  - The keyring_search_aux function in     security/keys/keyring.c in the Linux kernel allows     local users to cause a denial of service via a     request_key system call for the 'dead' key     type.(CVE-2017-6951i1/4%0

  - A flaw was found in the way the Linux kernel's XFS file     system handled replacing of remote attributes under     certain conditions. A local user with access to XFS     file system mount could potentially use this flaw to     escalate their privileges on the     system.(CVE-2015-0274i1/4%0

  - A memory leak in the kernel_read_file function in     fs/exec.c in the Linux kernel through 4.20.11 allows     attackers to cause a denial of service (memory     consumption) by triggering vfs_read     failures.(CVE-2019-8980i1/4%0

  - A flaw was found in the kernel's implementation of the     Berkeley Packet Filter (BPF). A local attacker could     craft BPF code to crash the system by creating a     situation in which the JIT compiler would fail to     correctly optimize the JIT image on the last pass. This     would lead to the CPU executing instructions that were     not part of the JIT code.(CVE-2015-4700i1/4%0

  - A security flaw was discovered in     nl80211_set_rekey_data() function in the Linux kernel     since v3.1-rc1 through v4.13. This function does not     check whether the required attributes are present in a     netlink request. This request can be issued by a user     with CAP_NET_ADMIN privilege and may result in NULL     dereference and a system crash.(CVE-2017-12153i1/4%0

  - The atyfb_ioctl function in     drivers/video/fbdev/aty/atyfb_base.c in the Linux     kernel through 4.12.10 does not initialize a certain     data structure, which allows local users to obtain     sensitive information from kernel stack memory by     reading locations associated with padding     bytes.(CVE-2017-14156i1/4%0

  - kernel/events/core.c in the performance subsystem in     the Linux kernel before 4.0 mismanages locks during     certain migrations, which allows local users to gain     privileges via a crafted application, aka Android     internal bug 31095224.(CVE-2016-6787i1/4%0

  - The ioresources_init function in kernel/resource.c in     the Linux kernel through 4.7, as used in Android before     2016-08-05 on Nexus 6 and 7 (2013) devices, uses weak     permissions for /proc/iomem, which allows local users     to obtain sensitive information by reading this file,     aka Android internal bug 28814213 and Qualcomm internal     bug CR786116. NOTE: the permissions may be intentional     in most non-Android contexts.(CVE-2015-8944i1/4%0

  - Race condition in the ioctl_file_dedupe_range function     in fs/ioctl.c in the Linux kernel through 4.7 allows     local users to cause a denial of service (heap-based     buffer overflow) or possibly gain privileges by     changing a certain count value, aka a 'double fetch'     vulnerability.(CVE-2016-6516i1/4%0

  - It was found that the timer functionality in the Linux     kernel ALSA subsystem is prone to a race condition     between read and ioctl system call handlers, resulting     in an uninitialized memory disclosure to user space. A     local user could use this flaw to read information     belonging to other users.(CVE-2017-1000380i1/4%0

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

Several vulnerabilities have been discovered in the Linux kernel that may lead to a privilege escalation, denial of service or have other impacts.

CVE-2014-9888

Russell King found that on ARM systems, memory allocated for DMA buffers was mapped with executable permission. This made it easier to exploit other vulnerabilities in the kernel.

CVE-2014-9895

Dan Carpenter found that the MEDIA_IOC_ENUM_LINKS ioctl on media devices resulted in an information leak.

CVE-2016-6786 / CVE-2016-6787

It was discovered that the performance events subsystem does not properly manage locks during certain migrations, allowing a local attacker to escalate privileges. This can be mitigated by disabling unprivileged use of performance events: sysctl kernel.perf_event_paranoid=3

CVE-2016-8405

Peter Pi of Trend Micro discovered that the frame buffer video subsystem does not properly check bounds while copying color maps to userspace, causing a heap buffer out-of-bounds read, leading to information disclosure.

CVE-2017-5549

It was discovered that the KLSI KL5KUSB105 serial USB device driver could log the contents of uninitialised kernel memory, resulting in an information leak.

CVE-2017-6001

Di Shen discovered a race condition between concurrent calls to the performance events subsystem, allowing a local attacker to escalate privileges. This flaw exists because of an incomplete fix of CVE-2016-6786. This can be mitigated by disabling unprivileged use of performance events: sysctl kernel.perf_event_paranoid=3

CVE-2017-6074

Andrey Konovalov discovered a use-after-free vulnerability in the DCCP networking code, which could result in denial of service or local privilege escalation. On systems that do not already have the dccp module loaded, this can be mitigated by disabling it: echo >> /etc/modprobe.d/disable-dccp.conf install dccp false

For Debian 7 'Wheezy', these problems have been fixed in version 3.2.84-2.

For Debian 8 'Jessie', these problems have been fixed in version 3.16.39-1+deb8u1 or earlier.

We recommend that you upgrade your linux packages.

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

在 Linux 内核中发现多个可能导致权限升级、拒绝服务或造成其他影响的漏洞。CVE-2014-9888 Russell King 发现 ARM 系统上分配给 DMA 缓冲区的内存已映射为具有可执行权限。这使得内核中的其他漏洞更加容易利用。CVE-2014-9895 Dan Carpenter 发现媒体设备上的 MEDIA_IOC_ENUM_LINKS ioctl 导致信息泄露。CVE-2016-6786 / CVE-2016-6787 已发现性能事件子系统在某些迁移期间无法正确管理锁，从而允许本地攻击者升级权限。此问题可以通过禁用性能事件的非特权使用来缓解：sysctl kernel.perf_event_paranoid = 3 CVE-2016-8405 Trend Micro 的 Peter Pi 发现，在将颜色映射复制到用户空间时，帧缓冲区视频子系统未正确检查边界，导致堆缓冲区越界读取，从而造成信息泄露。CVE-2017-5549 已发现 KLSI KL5KUSB105 串行 USB 设备驱动程序可记录未初始化内核内存内容，从而造成信息泄露。CVE-2017-6001 Di Shen 发现并发调用性能事件子系统之间存在争用条件，可允许本地攻击者升级权限。存在此缺陷的原因是 CVE-2016-6786 的修复不完整。此问题可通过禁用性能事件的非特权使用来缓解：sysctl kernel.perf_event_paranoid = 3 CVE-2017-6074 Andrey Konovalov 在 DCCP 网络代码中发现一个释放后使用漏洞，可导致拒绝服务或本地权限升级。在尚未加载 dccp 模块的系统上，此问题可通过禁用此模块来缓解：echo >> /etc/modprobe.d/disable-dccp.conf install dccp false 对于 Debian 7“Wheezy”，这些问题已在版本 3.2.84-2 中修复。对于 Debian 8“Jessie”，这些问题已在 3.16.39-1+deb8u1 或更低版本中修复。建议您升级 linux 程序包。注意：Tenable Network Security 已直接从 DLA 安全公告中提取上述描述块。Tenable 已尝试在不引入其他问题的情况下，尽可能进行自动整理和排版。

ID	名稱	產品	系列	已發布	已更新	嚴重性
125100	EulerOS Virtualization 3.0.1.0 : kernel (EulerOS-SA-2019-1494)	Nessus	Huawei Local Security Checks	2019/5/15	2022/3/8	high
97332	Debian DLA-833-1 : linux セキュリティ更新	Nessus	Debian Local Security Checks	2017/2/23	2021/1/11	high
97357	Debian DSA-3791-1 : linux - セキュリティ更新	Nessus	Debian Local Security Checks	2017/2/24	2021/1/11	critical
97357	Debian DSA-3791-1：linux - 安全性更新	Nessus	Debian Local Security Checks	2017/2/24	2021/1/11	critical
97357	Debian DSA-3791-1：linux - 安全更新	Nessus	Debian Local Security Checks	2017/2/24	2021/1/11	critical
97357	Debian DSA-3791-1 : linux - security update	Nessus	Debian Local Security Checks	2017/2/24	2021/1/11	critical
97332	Debian DLA-833-1：linux 安全性更新	Nessus	Debian Local Security Checks	2017/2/23	2021/1/11	high
124829	EulerOS Virtualization for ARM 64 3.0.1.0 : kernel (EulerOS-SA-2019-1506)	Nessus	Huawei Local Security Checks	2019/5/13	2022/5/20	high
97332	Debian DLA-833-1 : linux security update	Nessus	Debian Local Security Checks	2017/2/23	2021/1/11	high
97332	Debian DLA-833-1：linux 安全更新	Nessus	Debian Local Security Checks	2017/2/23	2021/1/11	high

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