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
(end of life)
|
|
| hirsute |
Ignored
(end of life)
|
|
| impish |
Ignored
(end of life)
|
|
| jammy |
Needs triage
|
|
| kinetic |
Ignored
(end of life, was needs-triage)
|
|
| lunar |
Not vulnerable
(6.02+dfsg1-2ubuntu1)
|
|
| mantic |
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://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
- https://www.cve.org/CVERecord?id=CVE-2021-34557
- NVD
- Launchpad
- Debian