Buffer Overflow Affecting xscreensaver package, versions <5.45+dfsg1-2


Severity

Recommended
0.0
medium
0
10

Snyk's Security Team recommends NVD's CVSS assessment. Learn more

Threat Intelligence

EPSS
0.01% (1st percentile)

Do your applications use this vulnerable package?

In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.

Test your applications
  • Snyk IDSNYK-DEBIAN12-XSCREENSAVER-1564019
  • published11 Jun 2021
  • disclosed10 Jun 2021

Introduced: 10 Jun 2021

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

How to fix?

Upgrade Debian:12 xscreensaver to version 5.45+dfsg1-2 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 Debian. See How to fix? for Debian:12 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