Buffer Overflow Affecting xscreensaver package, versions <5.44-150000.5.6.1


Severity

Recommended
0.0
medium
0
10

Based on SUSE Linux Enterprise Server security rating.

Threat Intelligence

EPSS
0.48% (38th percentile)

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  • Snyk IDSNYK-SLES153-XSCREENSAVER-2970775
  • published4 Aug 2022
  • disclosed3 Aug 2022

Introduced: 3 Aug 2022

CVE-2021-34557  (opens in a new tab)
CWE-120  (opens in a new tab)

How to fix?

Upgrade SLES:15.3 xscreensaver to version 5.44-150000.5.6.1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream xscreensaver package and not the xscreensaver package as distributed by SLES. See How to fix? for SLES:15.3 relevant fixed versions and status.

XScreenSaver 5.45 can be bypassed if the machine has more than ten disconnectable video outputs. A buffer overflow in update_screen_layout() allows an attacker to bypass the standard screen lock authentication mechanism by crashing XScreenSaver. The attacker must physically disconnect many video outputs.

CVSS Base Scores

version 3.1