CVE-2020-8831
Description
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.
How to fix
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| canonical ubuntu_linux | 14.04, 16.04, 18.04, 19.10 | — |
| apport_project apport | No range specified | — |
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