LightDM through 1.22.0, when systemd is used in Ubuntu 16.10 and 17.x, allows physically…
Priority LOW 22Published · Updated
Key facts
- Attack vector
- Physical
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- No fix listed
Attack profile from CVSS 3.0 · NVD. Fix status from CNA.
Summary
LightDM through 1.22.0, when systemd is used in Ubuntu 16.10 and 17.x, allows physically proximate attackers to bypass intended AppArmor restrictions and visit the home directories of arbitrary users by establishing a guest session.
Why it matters now
EPSS 0.00418 36th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 3
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:lightdm_project:lightdm:*:*:*:*:*:*:*:* | up to 1.22.0 | Vulnerable | Lightdm Project |
| cpe:2.3:o:canonical:ubuntu_linux:16.10:*:*:*:*:*:*:* | 16.10 | Running on | Canonical |
| cpe:2.3:o:canonical:ubuntu_linux:17.04:*:*:*:*:*:*:* | 17.04 | Running on | Canonical |
- cpe:2.3:a:lightdm_project:lightdm:*:*:*:*:*:*:*:* Versions up to 1.22.0 Vulnerable ·Lightdm Project
- cpe:2.3:o:canonical:ubuntu_linux:16.10:*:*:*:*:*:*:* Versions 16.10 Running on ·Canonical
- cpe:2.3:o:canonical:ubuntu_linux:17.04:*:*:*:*:*:*:* Versions 17.04 Running on ·Canonical
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2017-8900
- 2026-10-03 Alias added: GHSA-2r8v-9m34-p378
References
More Lightdm Project Lightdm vulnerabilities
- TI-2017-05013 In LightDM through 1.22.0, a directory traversal issue in debian/guest-account.sh allows… CVSS 3.0HIGH 7.3
- TI-2011-02959 Improper privilege management in lightdm CVSS 3.1HIGH 7.8
- TI-2015-06845 Array index error in LightDM (aka Light Display Manager) 1.14.3, 1.16.x before 1.16.6… CVSS 3.0MEDIUM 5.9
Sources
- CVE-2017-8900 · CVE Program
- CVE-2017-8900 · NVD
- FIRST EPSS
- GHSA-2r8v-9m34-p378 · GitHub Advisory Database · CC BY 4.0
- CVE-2017-8900 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences