Out-of-bounds Write Affecting libx11 package, versions <2:1.6.6-1


Severity

Recommended
low

Based on Debian security rating

    Threat Intelligence

    EPSS
    5.05% (93rd percentile)

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  • Snyk ID SNYK-DEBIANUNSTABLE-LIBX11-339148
  • published 25 Sep 2018
  • disclosed 24 Aug 2018

How to fix?

Upgrade Debian:unstable libx11 to version 2:1.6.6-1 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:unstable relevant fixed versions and status.

An issue was discovered in libX11 through 1.6.5. The function XListExtensions in ListExt.c interprets a variable as signed instead of unsigned, resulting in an out-of-bounds write (of up to 128 bytes), leading to DoS or remote code execution.

CVSS Scores

version 3.1
Expand this section

Red Hat

8.1 high
  • Attack Vector (AV)
    Network
  • Attack Complexity (AC)
    High
  • Privileges Required (PR)
    None
  • User Interaction (UI)
    None
  • Scope (S)
    Unchanged
  • Confidentiality (C)
    High
  • Integrity (I)
    High
  • Availability (A)
    High