CVE-2020-8831
World writable root owned lock file created in user controllable location
- State
- Published
- Severity
- 6.5 Medium
- Published
- Apr 22, 2020
- Updated
- Sep 16, 2024
- Reserved
- Feb 10, 2020
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 6.5 Medium | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N | canonical |
Weaknesses
- CWE-379 Creation of Temporary File in Directory with Incorrect Permissions
Affected Products
| Product | Versions |
|---|---|
ApportCanonical |
|
References
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