high
7.8
CWE
191
Advisory Published
CVE Published
Updated
Advisory Published

CVE-2020-14346: X.Org Server XIChangeHierarchy Integer Underflow Privilege Escalation Vulnerability

First published: Thu Jul 30 2020(Updated: )

A flaw was found in xorg-x11-server before 1.20.9. An integer underflow in the X input extension protocol decoding in the X server may lead to arbitrary access of memory contents. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

Credit: secalert@redhat.com secalert@redhat.com

Affected SoftwareAffected VersionHow to fix
X.org Xorg-server<1.20.9
Canonical Ubuntu Linux=14.04
Redhat Enterprise Linux=6.0
Redhat Enterprise Linux=7.0
Redhat Enterprise Linux=8.0
IBM Cloud Pak for Security (CP4S)<=1.7.2.0
IBM Cloud Pak for Security (CP4S)<=1.7.1.0
IBM Cloud Pak for Security (CP4S)<=1.7.0.0
X.Org Server
redhat/xorg-x11-server<1.20.9
1.20.9
ubuntu/xorg-server<2:1.19.6-1ubuntu4.5
2:1.19.6-1ubuntu4.5
ubuntu/xorg-server<2:1.20.8-2ubuntu2.3
2:1.20.8-2ubuntu2.3
ubuntu/xorg-server<2:1.15.1-0ubuntu2.11+
2:1.15.1-0ubuntu2.11+
ubuntu/xorg-server<1.20.9
1.20.9
ubuntu/xorg-server<2:1.18.4-0ubuntu0.9
2:1.18.4-0ubuntu0.9
ubuntu/xorg-server-hwe-16.04<1.20.9
1.20.9
ubuntu/xorg-server-hwe-16.04<2:1.19.6-1ubuntu4.1~16.04.3
2:1.19.6-1ubuntu4.1~16.04.3
ubuntu/xorg-server-hwe-18.04<2:1.20.8-2ubuntu2.2~18.04.2
2:1.20.8-2ubuntu2.2~18.04.2
ubuntu/xorg-server-hwe-18.04<1.20.9
1.20.9
debian/xorg-server
2:1.20.4-1+deb10u4
2:1.20.4-1+deb10u14
2:1.20.11-1+deb11u11
2:1.20.11-1+deb11u13
2:21.1.7-3+deb12u5
2:21.1.7-3+deb12u7
2:21.1.12-1

Remedy

https://lists.x.org/archives/xorg-announce/2020-August/003058.html

Remedy

https://gitlab.freedesktop.org/xorg/xserver/-/commit/c940cc8b6c0a2983c1ec974f1b3f019795dd4cff

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is CVE-2020-14346?

    CVE-2020-14346 is a vulnerability that allows local attackers to escalate privileges on affected installations of X.Org Server.

  • What is the severity of CVE-2020-14346?

    CVE-2020-14346 has a severity value of 7.8, which is considered high.

  • How can an attacker exploit CVE-2020-14346?

    An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability.

  • Which software versions are affected by CVE-2020-14346?

    CVE-2020-14346 affects X.Org Server versions up to and including 1.20.9.

  • Where can I find more information about CVE-2020-14346?

    You can find more information about CVE-2020-14346 on the MITRE CVE website, the X.Org Server announcement, and the Red Hat security advisory.

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