driver/subprocs.c in XScreenSaver before 5.34 does not properly perform an internal consistency check, which allows physically proximate attackers to bypass the lock screen by hot swapping monitors.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Ubuntu_linux | Canonical | 12.04 (including) | 12.04 (including) |
| Xscreensaver | Ubuntu | precise | * |
| Xscreensaver | Ubuntu | trusty | * |
| Xscreensaver | Ubuntu | upstream | * |
| Xscreensaver | Ubuntu | vivid | * |
| Xscreensaver | Ubuntu | wily | * |
References
- http://lists.opensuse.org/opensuse-updates/2015-11/msg00102.html
- http://www.debian.org/security/2016/dsa-3438
- http://www.openwall.com/lists/oss-security/2015/10/24/2
- http://www.openwall.com/lists/oss-security/2015/10/25/1
- http://www.openwall.com/lists/oss-security/2015/10/29/12
- http://www.oracle.com/technetwork/topics/security/bulletinjul2016-3090568.html
- http://www.securitytracker.com/id/1034052
- http://www.ubuntu.com/usn/USN-2789-1
- https://twitter.com/Thaolia/status/656823859304398848
- https://www.jwz.org/blog/2015/10/xscreensaver-5-34/
- http://lists.opensuse.org/opensuse-updates/2015-11/msg00102.html
- http://www.debian.org/security/2016/dsa-3438
- http://www.openwall.com/lists/oss-security/2015/10/24/2
- http://www.openwall.com/lists/oss-security/2015/10/25/1
- http://www.openwall.com/lists/oss-security/2015/10/29/12
- http://www.oracle.com/technetwork/topics/security/bulletinjul2016-3090568.html
- http://www.securitytracker.com/id/1034052
- http://www.ubuntu.com/usn/USN-2789-1
- https://twitter.com/Thaolia/status/656823859304398848
- https://www.jwz.org/blog/2015/10/xscreensaver-5-34/