lightdm before 0.9.6 writes in .dmrc and Xauthority files using root permissions while the files are in user controlled folders. A local user can overwrite root-owned files via a symlink, which can allow possible privilege escalation.
Weakness
The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Lightdm | Lightdm_project | * | 0.9.6 (excluding) |
| Lightdm | Ubuntu | natty | * |
| Lightdm | Ubuntu | oneiric | * |
| Lightdm | Ubuntu | upstream | * |
Potential Mitigations
Related Attack Patterns
- https://cwe.mitre.org/data/definitions/122.html
- https://cwe.mitre.org/data/definitions/233.html
- https://cwe.mitre.org/data/definitions/58.html
References
- https://access.redhat.com/security/cve/cve-2011-3349
- https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=639151
- https://bugs.launchpad.net/debian/+source/lightdm/+bug/834079
- https://seclists.org/oss-sec/2011/q3/393
- https://security-tracker.debian.org/tracker/CVE-2011-3349
- https://www.securityfocus.com/bid/50506
- https://access.redhat.com/security/cve/cve-2011-3349
- https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=639151
- https://bugs.launchpad.net/debian/+source/lightdm/+bug/834079
- https://seclists.org/oss-sec/2011/q3/393
- https://security-tracker.debian.org/tracker/CVE-2011-3349
- https://www.securityfocus.com/bid/50506