Use After Free Affecting xorg-server-hwe-16.04 package, versions <2:1.19.6-1ubuntu4.1~16.04.6+esm4


Severity

Recommended
medium

Based on Ubuntu security rating

    Threat Intelligence

    EPSS
    0.25% (66th percentile)

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  • Snyk ID SNYK-UBUNTU1604-XORGSERVERHWE1604-3171269
  • published 14 Dec 2022
  • disclosed 14 Dec 2022

How to fix?

Upgrade Ubuntu:16.04 xorg-server-hwe-16.04 to version 2:1.19.6-1ubuntu4.1~16.04.6+esm4 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream xorg-server-hwe-16.04 package and not the xorg-server-hwe-16.04 package as distributed by Ubuntu. See How to fix? for Ubuntu:16.04 relevant fixed versions and status.

A vulnerability was found in X.Org. This security flaw occurs because the XkbCopyNames function left a dangling pointer to freed memory, resulting in out-of-bounds memory access on subsequent XkbGetKbdByName requests.. This issue can lead to local privileges elevation on systems where the X server is running privileged and remote code execution for ssh X forwarding sessions.

CVSS Scores

version 3.1
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NVD

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

7.8 high
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Red Hat

7.8 high