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
    6.16% (94th percentile)

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  • Snyk ID SNYK-UBUNTU1604-XORGSERVERHWE1604-3170811
  • 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 handler for the ScreenSaverSetAttributes request may write to memory after it has been freed. 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

8.8 high
  • Attack Vector (AV)
    Network
  • 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

4.4 medium
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Red Hat

8.8 high