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Buffer Overflow Affecting libx11 package, versions <2:1.6.2-1ubuntu2.1+esm2

medium

Snyk CVSS

    Attack Complexity Low
    Confidentiality High
    Integrity High
    Availability High

    Threat Intelligence

    EPSS 13.65% (96th percentile)
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NVD
9.8 critical
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SUSE
8.1 high
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Red Hat
8.1 high

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  • Snyk ID SNYK-UBUNTU1404-LIBX11-1296793
  • published 20 May 2021
  • disclosed 27 May 2021
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Introduced: 20 May 2021

CVE-2021-31535 Open this link in a new tab
CWE-120 Open this link in a new tab

How to fix?

Upgrade Ubuntu:14.04 libx11 to version 2:1.6.2-1ubuntu2.1+esm2 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream libx11 package and not the libx11 package as distributed by Ubuntu. See How to fix? for Ubuntu:14.04 relevant fixed versions and status.

LookupCol.c in X.Org X through X11R7.7 and libX11 before 1.7.1 might allow remote attackers to execute arbitrary code. The libX11 XLookupColor request (intended for server-side color lookup) contains a flaw allowing a client to send color-name requests with a name longer than the maximum size allowed by the protocol (and also longer than the maximum packet size for normal-sized packets). The user-controlled data exceeding the maximum size is then interpreted by the server as additional X protocol requests and executed, e.g., to disable X server authorization completely. For example, if the victim encounters malicious terminal control sequences for color codes, then the attacker may be able to take full control of the running graphical session.

References