Integer underflow in X.org Server - CVE-2021-3472

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Main Vulnerability Database Vulnerabilities #VU52197

Integer underflow in X.org Server - CVE-2021-3472

Published: April 13, 2021


Vulnerability identifier: #VU52197
CSH Severity: Low
CVSS v4: 9.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H]
CVE-ID: CVE-2021-3472
CWE-ID: CWE-191
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to integer underflow within the XChangeFeedbackControl() function. A local user can run a specially crafted program to trigger integer underflow and escalate privileges on the system.


Affected software

X.org Server
Amazon Linux AMI
Gentoo Linux
SUSE Manager Server
SUSE Manager Retail Branch Server
SUSE Manager Proxy
SUSE CaaS Platform
SUSE Enterprise Storage
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux Server
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux Desktop
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, big endian
Red Hat Enterprise Linux for Scientific Computing
CentOS
HPE Helion Openstack
SUSE OpenStack Cloud Crowbar
SUSE OpenStack Cloud
SUSE Linux Enterprise Point of Sale
SUSE Linux Enterprise Debuginfo
SUSE Linux Enterprise Server
SUSE Linux Enterprise Server for SAP
SUSE Linux Enterprise Software Development Kit
Ubuntu
SUSE Linux Enterprise High Performance Computing
SUSE Linux Enterprise Workstation Extension
SUSE Linux Enterprise Module for Development Tools
SUSE Linux Enterprise Module for Basesystem
openEuler
Fedora
xorg-x11-server (Red Hat package)
xorg-server (Debian package)
xserver-xorg-core (Ubuntu package)
xorg-x11-server-extra-debuginfo
xorg-x11-server-extra
xorg-x11-server-debugsource
xorg-x11-server-debuginfo
xorg-x11-server
xorg-x11-server-sdk
xorg-x11-server-wayland
xorg-x11-server-wayland-debuginfo
xorg-x11-server-Xephyr
xorg-x11-server-devel
xorg-x11-server-help
xorg-x11-Xvnc
xorg-x11-server-Xwayland
xserver-xorg-core-hwe-16.04 (Ubuntu package)
xserver-xorg-core-hwe-18.04 (Ubuntu package)

How to mitigate CVE-2021-3472

Install updates from vendor's website.

X.org Server - update to 1.20.11
xorg-x11-server (Red Hat package) - update to 1.20.4-16.el7_9
xorg-server (Debian package) - update to 2:1.20.4-1+deb10u3
xserver-xorg-core (Ubuntu package) - addressed in versions 2:1.15.1-0ubuntu2.11+esm4, 2:1.18.4-0ubuntu0.12, 2:1.19.6-1ubuntu4.9, 2:1.20.9-2ubuntu1.2~20.04.2, 2:1.20.9-2ubuntu1.3
xorg-x11-server-extra-debuginfo - addressed in versions 1.19.6-4.22.1, 1.19.6-8.30.1, 1.19.6-10.23.1, 1.20.3-14.5.16.1, 1.20.3-22.5.25.1, 7.6_1.18.3-76.40.1
xorg-x11-server-extra - addressed in versions 1.19.6-4.22.1, 1.19.6-8.30.1, 1.19.6-10.23.1, 1.20.3-14.5.16.1, 1.20.3-22.5.25.1, 7.4-27.122.40.1, 7.6_1.18.3-76.40.1
xorg-x11-server-debugsource - addressed in versions 1.19.6-4.22.1, 1.19.6-8.30.1, 1.19.6-10.23.1, 1.20.3-14.5.16.1, 1.20.3-22.5.25.1, 7.4-27.122.40.1, 7.6_1.18.3-76.40.1
xorg-x11-server-debuginfo - addressed in versions 1.19.6-4.22.1, 1.19.6-8.30.1, 1.19.6-10.23.1, 1.20.3-14.5.16.1, 1.20.3-22.5.25.1, 7.4-27.122.40.1, 7.6_1.18.3-76.40.1
xorg-x11-server - addressed in versions 1.19.6-4.22.1, 1.19.6-8.30.1, 1.19.6-10.23.1, 1.20.3-14.5.16.1, 1.20.3-22.5.25.1, 7.4-27.122.40.1, 7.6_1.18.3-76.40.1
xorg-x11-server-sdk - addressed in versions 1.19.6-8.30.1, 1.19.6-10.23.1, 1.20.3-14.5.16.1, 1.20.3-22.5.25.1
xorg-x11-server-wayland - update to 1.20.3-22.5.25.1
xorg-x11-server-wayland-debuginfo - update to 1.20.3-22.5.25.1
xorg-x11-server-Xephyr - update to 1.20.8-7
xorg-x11-server-devel - update to 1.20.8-7
xorg-x11-server-debuginfo - update to 1.20.8-7
xorg-x11-server - update to 1.20.8-7
xorg-x11-server-debugsource - update to 1.20.8-7
xorg-x11-server-help - update to 1.20.8-7
xorg-x11-server - addressed in versions 1.20.11-1.fc32, 1.20.11-1.fc33, 1.20.11-1.fc34
xorg-x11-Xvnc - update to 7.4-27.122.40.1
xorg-x11-server-Xwayland - update to 21.1.1-1.fc34
xserver-xorg-core-hwe-16.04 (Ubuntu package) - update to 2:1.19.6-1ubuntu4.1~16.04.6
xserver-xorg-core-hwe-18.04 (Ubuntu package) - update to 2:1.20.8-2ubuntu2.2~18.04.5

External References

Related Security Bulletins