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Out-of-bounds Write Affecting libx11 package, versions <2:1.7.2-1+deb11u1

0.0
high

Snyk CVSS

    Attack Complexity Low
    Availability High

    Threat Intelligence

    EPSS 0.05% (17th percentile)
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NVD
7.5 high
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SUSE
7.3 high
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Red Hat
7.3 high

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  • Snyk ID SNYK-DEBIAN11-LIBX11-5710893
  • published 16 Jun 2023
  • disclosed 28 Jun 2023
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Introduced: 16 Jun 2023

CVE-2023-3138 Open this link in a new tab
CWE-787 Open this link in a new tab

How to fix?

Upgrade Debian:11 libx11 to version 2:1.7.2-1+deb11u1 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 Debian. See How to fix? for Debian:11 relevant fixed versions and status.

A vulnerability was found in libX11. The security flaw occurs because the functions in src/InitExt.c in libX11 do not check that the values provided for the Request, Event, or Error IDs are within the bounds of the arrays that those functions write to, using those IDs as array indexes. They trust that they were called with values provided by an Xserver adhering to the bounds specified in the X11 protocol, as all X servers provided by X.Org do. As the protocol only specifies a single byte for these values, an out-of-bounds value provided by a malicious server (or a malicious proxy-in-the-middle) can only overwrite other portions of the Display structure and not write outside the bounds of the Display structure itself, possibly causing the client to crash with this memory corruption.