VDB
CVE-2020-8831
CVE-2020-8831
PUBLISHED
CVSS 5.5 MEDIUM
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.
EPSS 0.65% · 48.8th percentile
Risk Scores
CVSS 3.1
5.5
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
EPSS Score
0.65%
48.8th percentile
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Ubuntu:16.04:LTS | apport | 2.20-0ubuntu3, 2.20.1-0ubuntu2.21, 2.20.1-0ubuntu2.19 |
| Ubuntu:20.04:LTS | apport | 2.20.11-0ubuntu19, 2.20.11-0ubuntu20, 2.20.11-0ubuntu21 |
| Ubuntu:Pro:14.04:LTS | apport | 2.14.1-0ubuntu3.23, 2.12.6-0ubuntu1, 2.12.7-0ubuntu1 |
| Ubuntu:18.04:LTS | apport | 2.20.9-0ubuntu1, 2.20.9-0ubuntu7.11, 2.20.9-0ubuntu7.13 |
Timeline
- Apr 2, 2020 CVE Published
- Apr 14, 2021 EPSS Score
- Jun 23, 2021 EPSS Score
- Oct 26, 2021 EPSS Score
- Dec 28, 2021 EPSS Score
- Jan 6, 2022 EPSS Score
- Mar 1, 2022 EPSS Score
- Apr 1, 2022 EPSS Score
- May 3, 2022 EPSS Score
- Jul 4, 2022 EPSS Score
- Nov 8, 2022 EPSS Score
- Dec 31, 2022 EPSS Score
References
- https://ubuntu.com/security/CVE-2020-8831 third-party-advisory
- https://ubuntu.com/security/notices/USN-4315-1 vendor-advisory
- https://ubuntu.com/security/notices/USN-4315-2 vendor-advisory
- https://www.cve.org/CVERecord?id=CVE-2020-8831 third-party-advisory