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
Status
Package | Release | Status |
---|---|---|
xscreensaver Launchpad, Ubuntu, Debian |
bionic |
Needs triage
|
focal |
Needs triage
|
|
groovy |
Ignored
(reached end-of-life)
|
|
hirsute |
Ignored
(reached end-of-life)
|
|
impish |
Ignored
(reached end-of-life)
|
|
jammy |
Needs triage
|
|
kinetic |
Needs triage
|
|
lunar |
Not vulnerable
(6.02+dfsg1-2ubuntu1)
|
|
trusty |
Does not exist
|
|
upstream |
Released
(5.45+dfsg1-2)
|
|
xenial |
Needs triage
|
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 |
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