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.

Related CPE's

a

xscreensaver_project

xscreensaver

5.45

Vulnerable

o

fedoraproject

fedora

33

Vulnerable

References

http://www.openwall.com/lists/oss-security/2021/06/11/1

Mailing ListThird Party Advisory

http://www.openwall.com/lists/oss-security/2021/07/06/2

ExploitMailing ListThird Party Advisory

https://github.com/QubesOS/qubes-issues/issues/6595

Issue TrackingThird Party Advisory

https://github.com/QubesOS/qubes-secpack/blob/master/QSBs/qsb-068-2021.txt

ExploitThird Party Advisory

https://github.com/QubesOS/qubes-xscreensaver/blob/master/0001-Fix-updating-outputs-info.patch

PatchThird Party Advisory

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TC4QB7TRS4GS7LDXQQ4PC6J3LVFJYISV/

https://www.openwall.com/lists/oss-security/2021/06/05/1

ExploitMailing ListThird Party Advisory

Weaknesses

[email protected]

Primary
CWE-120

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

  • CVSS V3.1

  • CVSS V3.0

  • CVSS V2.0

Information

Source identifier

[email protected]

Vulnerability status

Modified

Published

2021-06-10T16:15:08.227

4 years ago

Last modified

2023-11-07T03:36:01.347

1 year ago