The remote Oracle Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2024-0557 advisory.

    - Fix CVE-2024-21886 tigervnc: xorg-x11-server: heap buffer overflow in DisableDevice       Resolves: RHEL-20389
    - Fix CVE-2024-21885 tigervnc: xorg-x11-server: heap buffer overflow in XISendDeviceHierarchyEvent       Resolves: RHEL-20383
    - Fix CVE-2024-0229 tigervnc: xorg-x11-server: reattaching to different master device may lead to out-of-     bounds memory access       Resolves: RHEL-20533

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 Ubuntu 20.04 LTS / 22.04 LTS / 23.04 / 23.10 host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-6587-1 advisory.

    Jan-Niklas Sohn discovered that the X.Org X Server incorrectly handled memory when processing the     DeviceFocusEvent and ProcXIQueryPointer APIs. An attacker could possibly use this issue to cause the X     Server to crash, obtain sensitive information, or execute arbitrary code. (CVE-2023-6816)

    Jan-Niklas Sohn discovered that the X.Org X Server incorrectly handled reattaching to a different master     device. An attacker could use this issue to cause the X Server to crash, leading to a denial of service,     or possibly execute arbitrary code. (CVE-2024-0229)

    Olivier Fourdan and Donn Seeley discovered that the X.Org X Server incorrectly labeled GLX PBuffers when     used with SELinux. An attacker could use this issue to cause the X Server to crash, leading to a denial of     service. (CVE-2024-0408)

    Olivier Fourdan discovered that the X.Org X Server incorrectly handled the curser code when used with     SELinux. An attacker could use this issue to cause the X Server to crash, leading to a denial of service.
    (CVE-2024-0409)

    Jan-Niklas Sohn discovered that the X.Org X Server incorrectly handled memory when processing the     XISendDeviceHierarchyEvent API. An attacker could possibly use this issue to cause the X Server to crash,     or execute arbitrary code. (CVE-2024-21885)

    Jan-Niklas Sohn discovered that the X.Org X Server incorrectly handled devices being disabled. An attacker     could possibly use this issue to cause the X Server to crash, or execute arbitrary code. (CVE-2024-21886)

Tenable has extracted the preceding description block directly from the Ubuntu 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 SUSE Linux SLED15 / SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2024:0111-1 advisory.

  - A flaw was found in X.Org server. Both DeviceFocusEvent and the XIQueryPointer reply contain a bit for     each logical button currently down. Buttons can be arbitrarily mapped to any value up to 255, but the     X.Org Server was only allocating space for the device's particular number of buttons, leading to a heap     overflow if a bigger value was used. (CVE-2023-6816)

  - The X.Org project reports: Both DeviceFocusEvent and the XIQueryPointer reply contain a bit     for each logical button currently down. Buttons can be arbitrarily             mapped to any value up to     255 but the X.Org Server was only             allocating space for the device's number of buttons,     leading to a heap overflow if a bigger value was used. If a device has both a button class and a key class     and             numButtons is zero, we can get an out-of-bounds write due             to event under-     allocation in the DeliverStateNotifyEvent             function. The XISendDeviceHierarchyEvent() function     allocates space to             store up to MAXDEVICES (256) xXIHierarchyInfo structures in info.
    If a device with a given ID was removed and a new device with             the same ID added both in the     same operation,             the single device ID will lead to two info structures being     written to info.             Since this case can occur for every device ID at once,             a total of     two times MAXDEVICES info structures might be written             to the allocation, leading to a heap     buffer overflow. The DisableDevice() function is called whenever an enabled device             is disabled     and it moves the device from the inputInfo.devices             linked list to the inputInfo.off_devices     linked list.             However, its link/unlink operation has an issue during the recursive     call to DisableDevice() due to the prev pointer pointing to a             removed device.             This     issue leads to a length mismatch between the total number of             devices and the number of device     in the list, leading to a heap             overflow and, possibly, to local privilege escalation.
    (CVE-2024-0229, CVE-2024-21885, CVE-2024-21886)

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

The remote Fedora 39 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2024-2815d55cdf advisory.

    Fix use after free related to CVE-2024-21886

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

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

The remote CentOS Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2024:0320 advisory.

  - A flaw was found in X.Org server. Both DeviceFocusEvent and the XIQueryPointer reply contain a bit for     each logical button currently down. Buttons can be arbitrarily mapped to any value up to 255, but the     X.Org Server was only allocating space for the device's particular number of buttons, leading to a heap     overflow if a bigger value was used. (CVE-2023-6816)

  - An out-of-bounds memory access flaw was found in the X.Org server. This issue can be triggered when a     device frozen by a sync grab is reattached to a different master device. This issue may lead to an     application crash, local privilege escalation (if the server runs with extended privileges), or remote     code execution in SSH X11 forwarding environments. (CVE-2024-0229)

  - A flaw was found in the X.Org server. The GLX PBuffer code does not call the XACE hook when creating the     buffer, leaving it unlabeled. When the client issues another request to access that resource (as with a     GetGeometry) or when it creates another resource that needs to access that buffer, such as a GC, the     XSELINUX code will try to use an object that was never labeled and crash because the SID is NULL.
    (CVE-2024-0408)

  - A flaw was found in the X.Org server. The cursor code in both Xephyr and Xwayland uses the wrong type of     private at creation. It uses the cursor bits type with the cursor as private, and when initiating the     cursor, that overwrites the XSELINUX context. (CVE-2024-0409)

  - A flaw was found in X.Org server. In the XISendDeviceHierarchyEvent function, it is possible to exceed the     allocated array length when certain new device IDs are added to the xXIHierarchyInfo struct. This can     trigger a heap buffer overflow condition, which may lead to an application crash or remote code execution     in SSH X11 forwarding environments. (CVE-2024-21885)

  - A heap buffer overflow flaw was found in the DisableDevice function in the X.Org server. This issue may     lead to an application crash or, in some circumstances, remote code execution in SSH X11 forwarding     environments. (CVE-2024-21886)

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

The remote CentOS Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the CESA-2024:0607 advisory.

  - A flaw was found in X.Org server. Both DeviceFocusEvent and the XIQueryPointer reply contain a bit for     each logical button currently down. Buttons can be arbitrarily mapped to any value up to 255, but the     X.Org Server was only allocating space for the device's particular number of buttons, leading to a heap     overflow if a bigger value was used. (CVE-2023-6816)

  - The X.Org project reports: Both DeviceFocusEvent and the XIQueryPointer reply contain a bit     for each logical button currently down. Buttons can be arbitrarily             mapped to any value up to     255 but the X.Org Server was only             allocating space for the device's number of buttons,     leading to a heap overflow if a bigger value was used. If a device has both a button class and a key class     and             numButtons is zero, we can get an out-of-bounds write due             to event under-     allocation in the DeliverStateNotifyEvent             function. The XISendDeviceHierarchyEvent() function     allocates space to             store up to MAXDEVICES (256) xXIHierarchyInfo structures in info.
    If a device with a given ID was removed and a new device with             the same ID added both in the     same operation,             the single device ID will lead to two info structures being     written to info.             Since this case can occur for every device ID at once,             a total of     two times MAXDEVICES info structures might be written             to the allocation, leading to a heap     buffer overflow. The DisableDevice() function is called whenever an enabled device             is disabled     and it moves the device from the inputInfo.devices             linked list to the inputInfo.off_devices     linked list.             However, its link/unlink operation has an issue during the recursive     call to DisableDevice() due to the prev pointer pointing to a             removed device.             This     issue leads to a length mismatch between the total number of             devices and the number of device     in the list, leading to a heap             overflow and, possibly, to local privilege escalation.
    (CVE-2024-0229, CVE-2024-21885, CVE-2024-21886)

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

ID	Name	Product	Family	Published	Updated	Severity
189865	Oracle Linux 9 : tigervnc (ELSA-2024-0557)	Nessus	Oracle Linux Local Security Checks	1/31/2024	9/21/2024	critical
189087	Ubuntu 20.04 LTS / 22.04 LTS / 23.04 / 23.10 : X.Org X Server vulnerabilities (USN-6587-1)	Nessus	Ubuntu Local Security Checks	1/16/2024	8/28/2024	critical
189170	SUSE SLED15 / SLES15 Security Update : xorg-x11-server (SUSE-SU-2024:0111-1)	Nessus	SuSE Local Security Checks	1/18/2024	1/29/2024	critical
189270	Fedora 39 : xorg-x11-server (2024-2815d55cdf)	Nessus	Fedora Local Security Checks	1/21/2024	11/14/2024	high
189284	CentOS 7 : xorg-x11-server (RHSA-2024:0320)	Nessus	CentOS Local Security Checks	1/22/2024	10/9/2024	critical
189770	CentOS 8 : tigervnc (CESA-2024:0607)	Nessus	CentOS Local Security Checks	1/30/2024	2/8/2024	critical

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