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Red Hat 7 RHSA-2023:0675-01 Critical: tigervnc Privilege Escalation

red hat
Calendar Grey February 8, 2023
Dist Redhat Esm H88
Upgrading tigervnc and xorg-x11-server on Red Hat Enterprise Linux 7 tackles significant security vulnerabilities.
An update for tigervnc and xorg-x11-server is now available for Red Hat Enterprise Linux 7

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

Summary

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.
X.Org is an open-source implementation of the X Window System. It provides the basic low-level functionality that full-fledged graphical user interfaces are designed upon.
Security Fix(es):
* xorg-x11-server: DeepCopyPointerClasses use-after-free leads to privilege elevation (CVE-2023-0494)
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.

Topics%20covered

Topics Covered

security advisory red hat privilege escalation important xorg-x11-server tigervnc

References

https://access.redhat.com/security/cve/CVE-2023-0494 https://access.redhat.com/security/updates/classification/#important

Package List

Red Hat Enterprise Linux Client (v. 7):
Source: tigervnc-1.8.0-24.el7_9.src.rpm xorg-x11-server-1.20.4-22.el7_9.src.rpm
noarch: tigervnc-icons-1.8.0-24.el7_9.noarch.rpm tigervnc-license-1.8.0-24.el7_9.noarch.rpm
x86_64: tigervnc-1.8.0-24.el7_9.x86_64.rpm tigervnc-debuginfo-1.8.0-24.el7_9.x86_64.rpm tigervnc-server-1.8.0-24.el7_9.x86_64.rpm tigervnc-server-minimal-1.8.0-24.el7_9.x86_64.rpm xorg-x11-server-Xephyr-1.20.4-22.el7_9.x86_64.rpm xorg-x11-server-Xorg-1.20.4-22.el7_9.x86_64.rpm xorg-x11-server-common-1.20.4-22.el7_9.x86_64.rpm xorg-x11-server-debuginfo-1.20.4-22.el7_9.x86_64.rpm
Red Hat Enterprise Linux Client Optional (v. 7):
noarch: tigervnc-server-applet-1.8.0-24.el7_9.noarch.rpm xorg-x11-server-source-1.20.4-22.el7_9.noarch.rpm
x86_64: tigervnc-debuginfo-1.8.0-24.el7_9.x86_64.rpm tigervnc-server-module-1.8.0-24.el7_9.x86_64.rpm xorg-x11-server-Xdmx-1.20.4-22.el7_9.x86_64.rpm xorg-x11-server-Xnest-1.20.4-22.el7_9.x86_64.rpm xorg-x11-server-Xvfb-1.20.4-22.el7_9.x86_64.rpm xorg-x11-server-Xwayland-1.20.4-22.el7_9.x86_64.rpm xorg-x11-server-debuginfo-1.20.4-22.el7_9.i686.rpm xorg-x11-server-debuginfo-1.20.4-22.el7_9.x86_64.rpm xorg-x11-server-devel-1.20.4-22.el7_9.i686.rpm xorg-x11-server-devel-1.20.4-22.el7_9.x86_64.rpm
Red Hat Enterprise Linux ComputeNode (v. 7):


Read the Full Advisory


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2023:0675-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2023:0675
Issue date: 2023-02-08

Topic

An update for tigervnc and xorg-x11-server is now available for Red HatEnterprise Linux 7.Red Hat Product Security has rated this update as having a security impactof Important. A Common Vulnerability Scoring System (CVSS) base score,which gives a detailed severity rating, is available for each vulnerabilityfrom the CVE link(s) in the References section.

Topics%20covered

Topics Covered

security advisory red hat privilege escalation important xorg-x11-server tigervnc

Relevant Releases Architectures

Red Hat Enterprise Linux Client (v. 7) - noarch, x86_64

Red Hat Enterprise Linux Client Optional (v. 7) - noarch, x86_64

Red Hat Enterprise Linux ComputeNode (v. 7) - noarch, x86_64

Red Hat Enterprise Linux ComputeNode Optional (v. 7) - noarch, x86_64

Red Hat Enterprise Linux Server (v. 7) - noarch, ppc64, ppc64le, s390x, x86_64

Red Hat Enterprise Linux Server Optional (v. 7) - noarch, ppc64, ppc64le, s390x, x86_64

Red Hat Enterprise Linux Workstation (v. 7) - noarch, x86_64

Red Hat Enterprise Linux Workstation Optional (v. 7) - noarch, x86_64

Bugs Fixed

2165995 - CVE-2023-0494 xorg-x11-server: DeepCopyPointerClasses use-after-free leads to privilege elevation

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