CVE-2017-7358
Description
In LightDM through 1.22.0, a directory traversal issue in debian/guest-account.sh allows local attackers to own arbitrary directory path locations and escalate privileges to root when the guest user logs out.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
Exploits
Public proof-of-concept code below. AS-IS, for defenders and authorised testing only.
Exploit-DB
LightDM (Ubuntu 16.04/16.10) - 'Guest Account' Local Privilege Escalation
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| arch | affected | | |
| debian | bookworm | fixed | 0 |
| debian | bullseye | fixed | 0 |
| debian | forky | fixed | 0 |
| debian | sid | fixed | 0 |
| debian | trixie | fixed | 0 |
| ubuntu | 16.04 | affected | |
| ubuntu | 16.10 | affected | |
Application impact
| Vendor | Product | Versions | Fixed |
|---|---|---|---|
| lightdm_project | lightdm | {"endIncluding":"1.22.0"} | |
References
- http://bazaar.launchpad.net/~lightdm-team/lightdm/trunk/revision/2478
- http://www.securityfocus.com/bid/97486
- https://launchpad.net/bugs/1677924
- https://lists.freedesktop.org/archives/lightdm/2017-April/001059.html
- https://www.exploit-db.com/exploits/41923/
- https://www.ubuntu.com/usn/usn-3255-1/
- https://security-tracker.debian.org/tracker/CVE-2017-7358
CWEs
CWE-22
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.