CVE-2020-8831

Published: 02 April 2020

Apport creates a world writable lock file with root ownership in the world writable /var/lock/apport directory. If the apport/ directory does not exist (this is not uncommon as /var/lock is a tmpfs), it will create the directory, otherwise it will simply continue execution using the existing directory. This allows for a symlink attack if an attacker were to create a symlink at /var/lock/apport, changing apport's lock file location. This file could then be used to escalate privileges, for example. Fixed in versions 2.20.1-0ubuntu2.23, 2.20.9-0ubuntu7.14, 2.20.11-0ubuntu8.8 and 2.20.11-0ubuntu22.

Priority

High

CVSS 3 base score: 5.5

Status

Package Release Status
apport
Launchpad, Ubuntu, Debian
Upstream Needs triage

Ubuntu 20.10 (Groovy Gorilla)
Released (2.20.11-0ubuntu22)
Ubuntu 20.04 LTS (Focal Fossa)
Released (2.20.11-0ubuntu22)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (2.20.9-0ubuntu7.14)
Ubuntu 16.04 LTS (Xenial Xerus)
Released (2.20.1-0ubuntu2.23)
Ubuntu 14.04 ESM (Trusty Tahr)
Released (2.14.1-0ubuntu3.29+esm4)
Ubuntu 12.04 ESM (Precise Pangolin) Does not exist