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CVE-2021-34557

Published: 10 June 2021

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.

Priority

Medium

Cvss 3 Severity Score

4.6

Score breakdown

Status

Package Release Status
xscreensaver
Launchpad, Ubuntu, Debian
bionic Needs triage

focal Needs triage

impish Ignored
(end of life)
jammy Needs triage

lunar Not vulnerable
(6.02+dfsg1-2ubuntu1)
trusty Does not exist

upstream
Released (5.45+dfsg1-2)
xenial Needs triage

groovy Ignored
(end of life)
hirsute Ignored
(end of life)
kinetic Ignored
(end of life, was needs-triage)
mantic Not vulnerable
(6.02+dfsg1-2ubuntu1)

Severity score breakdown

Parameter Value
Base score 4.6
Attack vector Physical
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H