Use After Free Affecting gdm3 package, versions <3.29.91-1ubuntu1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UBUNTU2004-GDM3-583899
- published14 Aug 2018
- disclosed14 Aug 2018
Introduced: 14 Aug 2018
CVE-2018-14424 (opens in a new tab)How to fix?
Upgrade Ubuntu:20.04 gdm3 to version 3.29.91-1ubuntu1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream gdm3 package and not the gdm3 package as distributed by Ubuntu.
See How to fix? for Ubuntu:20.04 relevant fixed versions and status.
The daemon in GDM through 3.29.1 does not properly unexport display objects from its D-Bus interface when they are destroyed, which allows a local attacker to trigger a use-after-free via a specially crafted sequence of D-Bus method calls, resulting in a denial of service or potential code execution.
References
- http://people.ubuntu.com/~ubuntu-security/cve/CVE-2018-14424
- https://gitlab.gnome.org/GNOME/gdm/issues/401
- https://www.debian.org/security/2018/dsa-4270
- https://lists.debian.org/debian-lts-announce/2018/09/msg00003.html
- https://security-tracker.debian.org/tracker/CVE-2018-14424
- http://www.securityfocus.com/bid/105179
- https://usn.ubuntu.com/3737-1/