The version of xorg-server installed on the remote host is prior to 1.20.14 / 21.1.4 / 21.1.5 / 22.1.6. It is, therefore, affected by multiple vulnerabilities as referenced in the SSA:2022-348-03 advisory.

  - A vulnerability was found in X.Org. This security flaw occurs because the XkbCopyNames function left a     dangling pointer to freed memory, resulting in out-of-bounds memory access on subsequent XkbGetKbdByName     requests.. This issue can lead to local privileges elevation on systems where the X server is running     privileged and remote code execution for ssh X forwarding sessions. (CVE-2022-4283)

  - A vulnerability was found in X.Org. This security flaw occurs becuase the swap handler for the     XTestFakeInput request of the XTest extension may corrupt the stack if GenericEvents with lengths larger     than 32 bytes are sent through a the XTestFakeInput request. This issue can lead to local privileges     elevation on systems where the X server is running privileged and remote code execution for ssh X     forwarding sessions. This issue does not affect systems where client and server use the same byte order.
    (CVE-2022-46340)

  - A vulnerability was found in X.Org. This security flaw occurs because the handler for the XIPassiveUngrab     request accesses out-of-bounds memory when invoked with a high keycode or button code. This issue can lead     to local privileges elevation on systems where the X server is running privileged and remote code     execution for ssh X forwarding sessions. (CVE-2022-46341)

  - A vulnerability was found in X.Org. This security flaw occurs because the handler for the     XvdiSelectVideoNotify request may write to memory after it has been freed. This issue can lead to local     privileges elevation on systems where the X se (CVE-2022-46342)

  - A vulnerability was found in X.Org. This security flaw occurs because the handler for the     ScreenSaverSetAttributes request may write to memory after it has been freed. This issue can lead to local     privileges elevation on systems where the X server is running privileged and remote code execution for ssh     X forwarding sessions. (CVE-2022-46343)

  - A vulnerability was found in X.Org. This security flaw occurs because the handler for the XIChangeProperty     request has a length-validation issues, resulting in out-of-bounds memory reads and potential information     disclosure. This issue can lead to local privileges elevation on systems where the X server is running     privileged and remote code execution for ssh X forwarding sessions. (CVE-2022-46344)

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

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

  - A vulnerability was found in X.Org. This security flaw occurs because the XkbCopyNames function left a     dangling pointer to freed memory, resulting in out-of-bounds memory access on subsequent XkbGetKbdByName     requests.. This issue can lead to local privileges elevation on systems where the X server is running     privileged and remote code execution for ssh X forwarding sessions. (CVE-2022-4283)

  - A vulnerability was found in X.Org. This security flaw occurs becuase the swap handler for the     XTestFakeInput request of the XTest extension may corrupt the stack if GenericEvents with lengths larger     than 32 bytes are sent through a the XTestFakeInput request. This issue can lead to local privileges     elevation on systems where the X server is running privileged and remote code execution for ssh X     forwarding sessions. This issue does not affect systems where client and server use the same byte order.
    (CVE-2022-46340)

  - A vulnerability was found in X.Org. This security flaw occurs because the handler for the XIPassiveUngrab     request accesses out-of-bounds memory when invoked with a high keycode or button code. This issue can lead     to local privileges elevation on systems where the X server is running privileged and remote code     execution for ssh X forwarding sessions. (CVE-2022-46341)

  - A vulnerability was found in X.Org. This security flaw occurs because the handler for the     XvdiSelectVideoNotify request may write to memory after it has been freed. This issue can lead to local     privileges elevation on systems where the X se (CVE-2022-46342)

  - A vulnerability was found in X.Org. This security flaw occurs because the handler for the     ScreenSaverSetAttributes request may write to memory after it has been freed. This issue can lead to local     privileges elevation on systems where the X server is running privileged and remote code execution for ssh     X forwarding sessions. (CVE-2022-46343)

  - A vulnerability was found in X.Org. This security flaw occurs because the handler for the XIChangeProperty     request has a length-validation issues, resulting in out-of-bounds memory reads and potential information     disclosure. This issue can lead to local privileges elevation on systems where the X server is running     privileged and remote code execution for ssh X forwarding sessions. (CVE-2022-46344)

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.

The remote Redhat Enterprise Linux 9 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2023:2249 advisory.

    Xwayland is an X server for running X clients under Wayland.

    Security Fix(es):

    * xorg-x11-server: buffer overflow in _GetCountedString() in xkb/xkb.c (CVE-2022-3550)

    * xorg-x11-server: XkbGetKbdByName use-after-free (CVE-2022-4283)

    * xorg-x11-server: XTestSwapFakeInput stack overflow (CVE-2022-46340)

    * xorg-x11-server: XIPassiveUngrab out-of-bounds access (CVE-2022-46341)

    * xorg-x11-server: XvdiSelectVideoNotify use-after-free (CVE-2022-46342)

    * xorg-x11-server: ScreenSaverSetAttributes use-after-free (CVE-2022-46343)

    * xorg-x11-server: XIChangeProperty out-of-bounds access (CVE-2022-46344)

    * xorg-x11-server: DeepCopyPointerClasses use-after-free leads to privilege elevation (CVE-2023-0494)

    * xorg-x11-server: memory leak in ProcXkbGetKbdByName() in xkb/xkb.c (CVE-2022-3551)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

    Additional Changes:

    For detailed information on changes in this release, see the Red Hat Enterprise Linux 9.2 Release Notes     linked from the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise 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 remote Redhat Enterprise Linux 8 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2023:2805 advisory.

    Xwayland is an X server for running X clients under Wayland.

    Security Fix(es):

    * xorg-x11-server: buffer overflow in _GetCountedString() in xkb/xkb.c (CVE-2022-3550)

    * xorg-x11-server: XkbGetKbdByName use-after-free (CVE-2022-4283)

    * xorg-x11-server: XTestSwapFakeInput stack overflow (CVE-2022-46340)

    * xorg-x11-server: XIPassiveUngrab out-of-bounds access (CVE-2022-46341)

    * xorg-x11-server: XvdiSelectVideoNotify use-after-free (CVE-2022-46342)

    * xorg-x11-server: ScreenSaverSetAttributes use-after-free (CVE-2022-46343)

    * xorg-x11-server: XIChangeProperty out-of-bounds access (CVE-2022-46344)

    * xorg-x11-server: DeepCopyPointerClasses use-after-free leads to privilege elevation (CVE-2023-0494)

    * xorg-x11-server: memory leak in ProcXkbGetKbdByName() in xkb/xkb.c (CVE-2022-3551)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

    Additional Changes:

    For detailed information on changes in this release, see the Red Hat Enterprise Linux 8.8 Release Notes     linked from the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise 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 remote Oracle Linux 8 host has a package installed that is affected by multiple vulnerabilities as referenced in the ELSA-2023-2805 advisory.

    - Fix CVE-2023-0494 (#2166972)
    - Follow-up fix for CVE-2022-46340 (#2151777)
    - CVE fix for: CVE-2022-4283 (#2151802), CVE-2022-46340 (#2151777),       CVE-2022-46341 (#2151782), CVE-2022-46342 (#2151785),       CVE-2022-46343 (#2151792), CVE-2022-46344 (#2151795)

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 remote Alibaba Cloud Linux 3 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALINUX3-SA-2023:0062 advisory.

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

    CVE-2022-2319     A flaw was found in the Xorg-x11-server. An out-of-bounds access issue can occur in the ProcXkbSetGeometry     function due to improper validation of the request length.

    CVE-2022-3550:
    A vulnerability classified as critical was found in X.org Server. Affected by this vulnerability is the     function _GetCountedString of the file xkb/xkb.c. The manipulation leads to buffer overflow. It is     recommended to apply a patch to fix this issue. The associated identifier of this vulnerability is     VDB-211051.

    CVE-2022-3551:
    A vulnerability, which was classified as problematic, has been found in X.org Server. Affected by this     issue is the function ProcXkbGetKbdByName of the file xkb/xkb.c. The manipulation leads to memory leak. It     is recommended to apply a patch to fix this issue. The identifier of this vulnerability is VDB-211052.

    CVE-2022-4283:
    A vulnerability was found in X.Org. This security flaw occurs because the XkbCopyNames function left a     dangling pointer to freed memory, resulting in out-of-bounds memory access on subsequent XkbGetKbdByName     requests.. This issue can lead to local privileges elevation on systems where the X server is running     privileged and remote code execution for ssh X forwarding sessions.

    CVE-2022-46340:
    A vulnerability was found in X.Org. This security flaw occurs becuase the swap handler for the     XTestFakeInput request of the XTest extension may corrupt the stack if GenericEvents with lengths larger     than 32 bytes are sent through a the XTestFakeInput request. This issue can lead to local privileges     elevation on systems where the X server is running privileged and remote code execution for ssh X     forwarding sessions. This issue does not affect systems where client and server use the same byte order.

    CVE-2022-46341:
    A vulnerability was found in X.Org. This security flaw occurs because the handler for the XIPassiveUngrab     request accesses out-of-bounds memory when invoked with a high keycode or button code. This issue can lead     to local privileges elevation on systems where the X server is running privileged and remote code     execution for ssh X forwarding sessions.

    CVE-2022-46342:
    A vulnerability was found in X.Org. This security flaw occurs because the handler for the     XvdiSelectVideoNotify request may write to memory after it has been freed. This issue can lead to local     privileges elevation on systems where the X se

    CVE-2022-46343:
    A vulnerability was found in X.Org. This security flaw occurs because the handler for the     ScreenSaverSetAttributes request may write to memory after it has been freed. This issue can lead to local     privileges elevation on systems where the X server is running privileged and remote code execution for ssh     X forwarding sessions.

    CVE-2022-46344:
    A vulnerability was found in X.Org. This security flaw occurs because the handler for the XIChangeProperty     request has a length-validation issues, resulting in out-of-bounds memory reads and potential information     disclosure. This issue can lead to local privileges elevation on systems where the X server is running     privileged and remote code execution for ssh X forwarding sessions.

    CVE-2023-0494:
    A vulnerability was found in X.Org. This issue occurs due to a dangling pointer in DeepCopyPointerClasses     that can be exploited by ProcXkbSetDeviceInfo() and ProcXkbGetDeviceInfo() to read and write into freed     memory. This can lead to local privilege elevation on systems where the X server runs privileged and     remote code execution for ssh X forwarding sessions.

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.

ID	名稱	產品	系列	已發布	已更新	嚴重性
168742	Slackware Linux 15.0 / current xorg-server Multiple Vulnerabilities (SSA:2022-348-03)	Nessus	Slackware Local Security Checks	2022/12/14	2022/12/20	high
171154	EulerOS 2.0 SP8 : tigervnc (EulerOS-SA-2023-1340)	Nessus	Huawei Local Security Checks	2023/2/8	2024/1/16	high
175479	RHEL 9 : xorg-x11-server-Xwayland (RHSA-2023:2249)	Nessus	Red Hat Local Security Checks	2023/5/13	2024/11/7	high
176145	RHEL 8 : xorg-x11-server-Xwayland (RHSA-2023:2805)	Nessus	Red Hat Local Security Checks	2023/5/20	2024/11/7	high
176319	Oracle Linux 8 : xorg-x11-server-Xwayland (ELSA-2023-2805)	Nessus	Oracle Linux Local Security Checks	2023/5/24	2024/10/22	high
236015	Alibaba Cloud Linux 3 : 0062: xorg-x11-server (ALINUX3-SA-2023:0062)	Nessus	Alibaba Cloud Linux Local Security Checks	2025/5/14	2025/5/14	high

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