Integer underflow in X.org Server - CVE-2020-14346

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Main Vulnerability Database Vulnerabilities #VU46029

Integer underflow in X.org Server - CVE-2020-14346

Published: August 25, 2020


Vulnerability identifier: #VU46029
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-2020-14346
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 in the XIChangeHierarchy(). A local user can send a specially crafted request to the affected application, trigger integer underflow and execute arbitrary code on the target system with elevated privileges.


Affected software

X.org Server
Amazon Linux AMI
Gentoo Linux
Red Hat Enterprise Linux Server
CentOS
Red Hat Enterprise Linux for Scientific Computing
Red Hat Enterprise Linux for Power, big endian
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux Desktop
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for ARM 64
Red Hat CodeReady Linux Builder for ARM 64
Red Hat CodeReady Linux Builder for x86_64
Red Hat CodeReady Linux Builder for Power, little endian
Red Hat Enterprise Linux for x86_64
Ubuntu
Opensuse
openEuler
xorg-x11-server (Red Hat package)
xorg-server (Alpine package)
xorg-server (Debian package)
xserver-xorg-core (Ubuntu package)
xserver-xorg-core-hwe-16.04 (Ubuntu package)
xserver-xorg-core-hwe-18.04 (Ubuntu package)
egl-wayland (Red Hat package)
libglvnd (Red Hat package)
libwacom (Red Hat package)
libX11 (Red Hat package)
libinput (Red Hat package)
xorg-x11-server-devel
xorg-x11-server-Xephyr
xorg-x11-server-help
xorg-x11-server
xorg-x11-server-debugsource
xorg-x11-server-debuginfo
libdrm (Red Hat package)
xorg-x11-drivers (Red Hat package)
mesa (Red Hat package)
Cloud Pak for Security (CP4S)
OpenShift Virtualization
Data Computing Appliance (DCA)

How to mitigate CVE-2020-14346

Install updates from vendor's website.

X.org Server - update to 1.20.9
xorg-x11-server (Red Hat package) - addressed in versions 1.17.4-18.el6_10, 1.20.4-12.el7_9, 1.20.10-1.el8
Cloud Pak for Security (CP4S) - update to 1.8.0.0
xorg-server (Alpine package) - update to 1.20.9-r0
xorg-server (Debian package) - update to 1.20.4-1+deb10u1
xserver-xorg-core (Ubuntu package) - addressed in versions 2:1.15.1-0ubuntu2.11+esm2, 2:1.18.4-0ubuntu0.9, 2:1.19.6-1ubuntu4.5, 2:1.20.8-2ubuntu2.3
xserver-xorg-core-hwe-16.04 (Ubuntu package) - update to 2:1.19.6-1ubuntu4.1~16.04.3
xserver-xorg-core-hwe-18.04 (Ubuntu package) - update to 2:1.20.8-2ubuntu2.2~18.04.2
egl-wayland (Red Hat package) - update to 1.1.5-3.el8
libglvnd (Red Hat package) - update to 1.3.2-1.el8
libwacom (Red Hat package) - update to 1.6-2.el8
libX11 (Red Hat package) - update to 1.6.8-4.el8
libinput (Red Hat package) - update to 1.16.3-1.el8
xorg-x11-server-devel - update to 1.20.8-3
xorg-x11-server-Xephyr - update to 1.20.8-3
xorg-x11-server-help - update to 1.20.8-3
xorg-x11-server - update to 1.20.8-3
xorg-x11-server-debugsource - update to 1.20.8-3
xorg-x11-server-debuginfo - update to 1.20.8-3
libdrm (Red Hat package) - update to 2.4.103-1.el8
xorg-x11-drivers (Red Hat package) - update to 7.7-30.el8
mesa (Red Hat package) - update to 20.3.3-2.el8
OpenShift Virtualization - addressed in versions 2.6.6, 4.8.0
Data Computing Appliance (DCA) - update to 4.3.0.0

External References

Related Security Bulletins