Description
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.
References
http://www.openwall.com/lists/oss-security/2021/06/11/1
http://www.openwall.com/lists/oss-security/2021/07/06/2
https://github.com/QubesOS/qubes-issues/issues/6595
https://github.com/QubesOS/qubes-secpack/blob/master/QSBs/qsb-068-2021.txt
https://github.com/QubesOS/qubes-xscreensaver/blob/master/0001-Fix-updating-outputs-info.patch
https://www.openwall.com/lists/oss-security/2021/06/05/1
http://www.openwall.com/lists/oss-security/2021/06/11/1
http://www.openwall.com/lists/oss-security/2021/07/06/2
https://github.com/QubesOS/qubes-issues/issues/6595
https://github.com/QubesOS/qubes-secpack/blob/master/QSBs/qsb-068-2021.txt
https://github.com/QubesOS/qubes-xscreensaver/blob/master/0001-Fix-updating-outputs-info.patch
https://www.openwall.com/lists/oss-security/2021/06/05/1
CVSS impact metrics
CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
4.6 · Medium
Information
Source identifier
Vulnerability status
Modified
Published
2021-06-10T14:15:08.227Z
4 years agoLast modified
2024-11-21T05:10:40.827Z
1 year ago