CVE Vulnerability

CVE-2021-34557

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.

2.1 /10

CVSS v2.0 :

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 2.9

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact PARTIAL

Scope

4.6 /10

CVSS v3.0 : MEDIUM

V3 Legend

Vector :

Exploitability : 0.9 / Impact : 3.6

Attack Vector PHYSICAL

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://github.com/QubesOS/qubes-xscreensaver/blob/master/0001-Fix-updating-outputs-info.patch Patch Third Party Advisory
https://github.com/QubesOS/qubes-issues/issues/6595 Issue Tracking Third Party Advisory
https://github.com/QubesOS/qubes-secpack/blob/master/QSBs/qsb-068-2021.txt Exploit Third Party Advisory
https://www.openwall.com/lists/oss-security/2021/06/05/1 Exploit Mailing List
http://www.openwall.com/lists/oss-security/2021/06/11/1 Mailing List Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/07/06/2 Exploit Mailing List
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/TC4QB7TRS4GS7LDXQQ4PC6J3LVFJYISV/ Mailing List Third Party Advisory
Configurations

Configuration 1

cpe:2.3:a:xscreensaver_project:xscreensaver:5.45:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
Information

Published : 2021-06-10 04:15

Updated : 2021-09-21 04:39

NVD link : CVE-2021-34557

Mitre link : CVE-2021-34557

Products Affected
No products.
CWE
CWE-120