Off-by-one Error Affecting libx11 package, versions <2:1.6.6-1


Severity

Recommended
low

Based on Debian security rating

    Threat Intelligence

    EPSS
    1.05% (85th percentile)

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  • Snyk ID SNYK-DEBIANUNSTABLE-LIBX11-339160
  • 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 is vulnerable to an off-by-one error caused by malicious server responses, leading to DoS or possibly unspecified other impact.

CVSS Scores

version 3.1
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NVD

9.8 critical
  • Attack Vector (AV)
    Network
  • Attack Complexity (AC)
    Low
  • Privileges Required (PR)
    None
  • User Interaction (UI)
    None
  • Scope (S)
    Unchanged
  • Confidentiality (C)
    High
  • Integrity (I)
    High
  • Availability (A)
    High
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Red Hat

8.1 high