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 base score: 4.6
Status
| Package | Release | Status |
|---|---|---|
|
xscreensaver Launchpad, Ubuntu, Debian |
Upstream |
Released
(5.45+dfsg1-2)
|
| Ubuntu 21.04 (Hirsute Hippo) |
Needs triage
|
|
| Ubuntu 20.04 LTS (Focal Fossa) |
Needs triage
|
|
| Ubuntu 18.04 LTS (Bionic Beaver) |
Needs triage
|
|
| Ubuntu 16.04 ESM (Xenial Xerus) |
Ignored
(out of standard support)
|
|
| Ubuntu 14.04 ESM (Trusty Tahr) |
Does not exist
|
References
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-34557
- https://www.openwall.com/lists/oss-security/2021/06/05/1
- https://www.openwall.com/lists/oss-security/2021/06/05/2
- https://github.com/QubesOS/qubes-xscreensaver/blob/master/0001-Fix-updating-outputs-info.patch
- https://github.com/QubesOS/qubes-issues/issues/6595
- https://github.com/QubesOS/qubes-secpack/blob/master/QSBs/qsb-068-2021.txt
- NVD
- Launchpad
- Debian