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Amazon Linux 2 : tigervnc, --advisory ALAS2-2025-3065 (ALAS-2025-3065)
high Nessus Plugin ID 274666
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Synopsis
The remote Amazon Linux 2 host is missing a security update.Description
The version of tigervnc installed on the remote host is prior to 1.8.0-24. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2025-3065 advisory.A flaw was found in the X.Org X server and Xwayland when processing X11 Present extension notifications.
Improper error handling during notification creation can leave dangling pointers that lead to a use-after- free condition. This can cause memory corruption or a crash, potentially allowing an attacker to execute arbitrary code or cause a denial of service. (CVE-2025-62229)
When removing the Xkb resources for a client, the function XkbRemoveResourceClient() will free the XkbInterest data associated with the device, but not the resource associated with it. As a result, when the client terminates, the resource delete function triggers a use-after-free.
NOTE: https://lists.x.org/archives/xorg-announce/2025-October/003635.htmlNOTE: Fixed by:
https://gitlab.freedesktop.org/xorg/xserver/-/commit/99790a2c9205a52fbbec01f21a92c9b7f4ed1d8fNOTE: Fixed by: https://gitlab.freedesktop.org/xorg/xserver/-/commit/10c94238bdad17c11707e0bdaaa3a9cd54c504beNOTE:
Fixed by: https://gitlab.freedesktop.org/xorg/xserver/-/commit/865089ca70840c0f13a61df135f7b44a9782a175 (xorg-server-21.1.19)NOTE: Fixed by:
https://gitlab.freedesktop.org/xorg/xserver/-/commit/87fe2553937a99fd914ad0cde999376a3adc3839 (xorg- server-21.1.19) (CVE-2025-62230)
The XkbCompatMap structure stores some of its values using an unsigned short, but fails to check whether the sum of the input data might overflow the maximum unsigned short value
Introduced in: X11R6
Fixed in: xorg-server-21.1.19 and xwayland-24.1.9Fix:
https://gitlab.freedesktop.org/xorg/xserver/-/commit/475d9f49
NOTE: https://lists.x.org/archives/xorg-announce/2025-October/003635.htmlNOTE: Fixed by:
https://gitlab.freedesktop.org/xorg/xserver/-/commit/475d9f49acd0e55bc0b089ed77f732ad18585470NOTE: Fixed by: https://gitlab.freedesktop.org/xorg/xserver/-/commit/3baad99f9c15028ed8c3e3d8408e5ec35db155aa (xorg- server-21.1.19) (CVE-2025-62231)
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.
Solution
Run 'yum update tigervnc' or or 'yum update --advisory ALAS2-2025-3065' to update your system.See Also
https://alas.aws.amazon.com//AL2/ALAS2-2025-3065.html
https://alas.aws.amazon.com/faqs.html
https://explore.alas.aws.amazon.com/CVE-2025-62229.html
Plugin Details
Severity: High
ID: 274666
File Name: al2_ALAS-2025-3065.nasl
Version: 1.1
Type: local
Agent: unix
Published: 11/11/2025
Updated: 11/11/2025
Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Continuous Assessment, Nessus
Risk Information
VPR
Risk Factor: High
Score: 7.0
CVSS v2
Risk Factor: High
Base Score: 9
Temporal Score: 6.7
Vector: CVSS2#AV:N/AC:L/Au:S/C:C/I:C/A:C
CVSS Score Source: CVE-2025-62231
CVSS v3
Risk Factor: High
Base Score: 7.3
Temporal Score: 6.4
Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H
Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C
Vulnerability Information
CPE: cpe:/o:amazon:linux:2, p-cpe:/a:amazon:linux:tigervnc, p-cpe:/a:amazon:linux:tigervnc-server, p-cpe:/a:amazon:linux:tigervnc-debuginfo, p-cpe:/a:amazon:linux:tigervnc-server-applet, p-cpe:/a:amazon:linux:tigervnc-server-minimal, p-cpe:/a:amazon:linux:tigervnc-icons, p-cpe:/a:amazon:linux:tigervnc-license, p-cpe:/a:amazon:linux:tigervnc-server-module
Required KB Items: Host/local_checks_enabled, Host/AmazonLinux/release, Host/AmazonLinux/rpm-list
Exploit Ease: No known exploits are available
Patch Publication Date: 11/10/2025
Vulnerability Publication Date: 10/28/2025