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 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. (CVE-2023-0494)

  - A flaw was found in X.Org Server Overlay Window. A Use-After-Free may lead to local privilege escalation.
    If a client explicitly destroys the compositor overlay window (aka COW), the Xserver would leave a     dangling pointer to that window in the CompScreen structure, which will trigger a use-after-free later.
    (CVE-2023-1393)

  - A flaw was found in xorg-server. Querying or changing XKB button actions such as moving from a touchpad to     a mouse can result in out-of-bounds memory reads and writes. This may allow local privilege escalation or     possible remote code execution in cases where X11 forwarding is involved. (CVE-2023-6377)

  - A flaw was found in xorg-server. A specially crafted request to RRChangeProviderProperty or     RRChangeOutputProperty can trigger an integer overflow which may lead to a disclosure of sensitive     information. (CVE-2023-6478)

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 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2024:0017 advisory.

    Virtual Network Computing (VNC) is a remote display system which allows users to view a computing desktop     environment not only on the machine where it is running, but from anywhere on the Internet and from a wide     variety of machine architectures. TigerVNC is a suite of VNC servers and clients.

    Security Fix(es):

    * xorg-x11-server: out-of-bounds memory reads/writes in XKB button actions (CVE-2023-6377)

    * xorg-x11-server: out-of-bounds memory read in RRChangeOutputProperty and RRChangeProviderProperty     (CVE-2023-6478)

    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.

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.

According to the versions of the xorg-x11-server package installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

    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)

    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)

    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 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)

    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 xorg-server. A specially crafted request to RRChangeProviderProperty or     RRChangeOutputProperty can trigger an integer overflow which may lead to a disclosure of sensitive     information.(CVE-2023-6478)

    A flaw was found in xorg-server. Querying or changing XKB button actions such as moving from a touchpad to     a mouse can result in out-of-bounds memory reads and writes. This may allow local privilege escalation or     possible remote code execution in cases where X11 forwarding is involved.(CVE-2023-6377)

Tenable has extracted the preceding description block directly from the EulerOS xorg-x11-server 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-2024:2996 advisory.

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

    Security Fix(es):

    * xorg-x11-server: Out-of-bounds write in XIChangeDeviceProperty/RRChangeOutputProperty (CVE-2023-5367)

    * xorg-x11-server: out-of-bounds memory reads/writes in XKB button actions (CVE-2023-6377)

    * xorg-x11-server: out-of-bounds memory read in RRChangeOutputProperty and RRChangeProviderProperty     (CVE-2023-6478)

    * xorg-x11-server: Heap buffer overflow in DeviceFocusEvent and ProcXIQueryPointer (CVE-2023-6816)

    * xorg-x11-server: reattaching to different master device may lead to out-of-bounds memory access     (CVE-2024-0229)

    * xorg-x11-server: SELinux unlabeled GLX PBuffer (CVE-2024-0408)

    * xorg-x11-server: SELinux context corruption (CVE-2024-0409)

    * xorg-x11-server: heap buffer overflow in XISendDeviceHierarchyEvent (CVE-2024-21885)

    * xorg-x11-server: heap buffer overflow in DisableDevice (CVE-2024-21886)

    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 8.10 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 Ubuntu 14.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-6587-5 advisory.

    USN-6587-1 fixed several vulnerabilities in X.Org. This update provides the corresponding update for     Ubuntu 14.04 LTS.



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 Oracle Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2024-2169 advisory.

    - Fix use after free related to CVE-2024-21886
    - CVE fix for: CVE-2023-6816, CVE-2024-0229, CVE-2024-21885, CVE-2024-21886,       CVE-2024-0408 and CVE-2024-0409       Resolves: https://issues.redhat.com/browse/RHEL-21203       Resolves: https://issues.redhat.com/browse/RHEL-20531       Resolves: https://issues.redhat.com/browse/RHEL-20380       Resolves: https://issues.redhat.com/browse/RHEL-20386       Resolves: https://issues.redhat.com/browse/RHEL-21193       Resolves: https://issues.redhat.com/browse/RHEL-21200
    - CVE fix for: CVE-2023-6377, CVE-2023-6478       Resolves: https://issues.redhat.com/browse/RHEL-18322       Resolves: https://issues.redhat.com/browse/RHEL-18329
    - CVE fix for: CVE-2023-5380       Resolves: https://issues.redhat.com/browse/RHEL-14062

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 AlmaLinux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALSA-2024:0010 advisory.

  - A out-of-bounds write flaw was found in the xorg-x11-server. This issue occurs due to an incorrect     calculation of a buffer offset when copying data stored in the heap in the XIChangeDeviceProperty function     in Xi/xiproperty.c and in RRChangeOutputProperty function in randr/rrproperty.c, allowing for possible     escalation of privileges or denial of service. (CVE-2023-5367)

  - A flaw was found in xorg-server. Querying or changing XKB button actions such as moving from a touchpad to     a mouse can result in out-of-bounds memory reads and writes. This may allow local privilege escalation or     possible remote code execution in cases where X11 forwarding is involved. (CVE-2023-6377)

  - A flaw was found in xorg-server. A specially crafted request to RRChangeProviderProperty or     RRChangeOutputProperty can trigger an integer overflow which may lead to a disclosure of sensitive     information. (CVE-2023-6478)

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 FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by multiple vulnerabilities as referenced in the 972568d6-3485-40ab-80ff-994a8aaf9683 advisory.

  - A flaw was found in xorg-server. Querying or changing XKB button actions such as moving from a touchpad to     a mouse can result in out-of-bounds memory reads and writes. This may allow local privilege escalation or     possible remote code execution in cases where X11 forwarding is involved. (CVE-2023-6377)

  - A flaw was found in xorg-server. A specially crafted request to RRChangeProviderProperty or     RRChangeOutputProperty can trigger an integer overflow which may lead to a disclosure of sensitive     information. (CVE-2023-6478)

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 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2023:7886 advisory.

    Virtual Network Computing (VNC) is a remote display system which allows users to view a computing desktop     environment not only on the machine where it is running, but from anywhere on the Internet and from a wide     variety of machine architectures. TigerVNC is a suite of VNC servers and clients.

    Security Fix(es):

    * xorg-x11-server: out-of-bounds memory reads/writes in XKB button actions (CVE-2023-6377)

    * xorg-x11-server: out-of-bounds memory read in RRChangeOutputProperty and RRChangeProviderProperty     (CVE-2023-6478)

    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.

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 Fedora 38 host has packages installed that are affected by multiple vulnerabilities as referenced in the FEDORA-2023-ec02e360af advisory.

    CVE fix for: CVE-2023-6377, CVE-2023-6478


Tenable has extracted the preceding description block directly from the Fedora 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 tigervnc installed on the remote host is prior to 1.12.0 / 1.13.1. It is, therefore, affected by multiple vulnerabilities as referenced in the SSA:2024-021-01 advisory.

  - A flaw was found in xorg-server. Querying or changing XKB button actions such as moving from a touchpad to     a mouse can result in out-of-bounds memory reads and writes. This may allow local privilege escalation or     possible remote code execution in cases where X11 forwarding is involved. (CVE-2023-6377)

  - A flaw was found in xorg-server. A specially crafted request to RRChangeProviderProperty or     RRChangeOutputProperty can trigger an integer overflow which may lead to a disclosure of sensitive     information. (CVE-2023-6478)

  - 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)

  - 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)

  - 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
191884	EulerOS 2.0 SP8 : tigervnc (EulerOS-SA-2024-1304)	Nessus	Huawei Local Security Checks	3/12/2024	3/12/2024	high
187427	RHEL 8 : tigervnc (RHSA-2024:0017)	Nessus	Red Hat Local Security Checks	1/2/2024	11/7/2024	high
198184	EulerOS 2.0 SP12 : xorg-x11-server (EulerOS-SA-2024-1758)	Nessus	Huawei Local Security Checks	5/30/2024	5/30/2024	critical
197776	RHEL 8 : xorg-x11-server-Xwayland (RHSA-2024:2996)	Nessus	Red Hat Local Security Checks	5/23/2024	11/7/2024	critical
192054	Ubuntu 14.04 LTS : X.Org X Server vulnerabilities (USN-6587-5)	Nessus	Ubuntu Local Security Checks	3/13/2024	10/29/2024	critical
195083	Oracle Linux 9 : xorg-x11-server (ELSA-2024-2169)	Nessus	Oracle Linux Local Security Checks	5/6/2024	11/2/2024	critical
187636	AlmaLinux 9 : tigervnc (ALSA-2024:0010)	Nessus	Alma Linux Local Security Checks	1/4/2024	1/4/2024	high
186808	FreeBSD : xorg-server -- Multiple vulnerabilities (972568d6-3485-40ab-80ff-994a8aaf9683)	Nessus	FreeBSD Local Security Checks	12/13/2023	12/22/2023	high
187124	RHEL 9 : tigervnc (RHSA-2023:7886)	Nessus	Red Hat Local Security Checks	12/20/2023	11/7/2024	high
187922	Fedora 38 : tigervnc / xorg-x11-server (2023-ec02e360af)	Nessus	Fedora Local Security Checks	1/10/2024	11/14/2024	high
189266	Slackware Linux 15.0 / current tigervnc Multiple Vulnerabilities (SSA:2024-021-01)	Nessus	Slackware Local Security Checks	1/21/2024	1/29/2024	critical

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