Vulnerability · Published Dec 28, 2020 · Assigned by redhat
CVE-2020-27837
Medium 6.4
In plain English
A medium-severity race condition in gdm. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 14% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)6.4Medium
Exploit odds (30 days)0.2%top 86.4% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
A flaw was found in GDM in versions prior to 3.38.2.1. A race condition in the handling of session shutdown makes it possible to bypass the lock screen for a user that has autologin enabled, accessing their session without authentication. This is similar to CVE-2017-12164, but requires more difficult conditions to exploit.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | gdm3 | 3.38.2.1-1 | DEBIAN-CVE-2020-27837 |
| Debian:13 | gdm3 | 3.38.2.1-1 | DEBIAN-CVE-2020-27837 |
| Debian:14 | gdm3 | 3.38.2.1-1 | DEBIAN-CVE-2020-27837 |
| Ubuntu:22.04:LTS | gdm3 | no fix listed | UBUNTU-CVE-2020-27837 |
Affected products (as reported)
Weakness: CWE-362
References
- https://bugzilla.redhat.com/show_bug.cgi?id=1906812 x_refsource_MISC