VDB
CVE-2020-8833
CVE-2020-8833
PUBLISHED
Time-of-check Time-of-use Race Condition vulnerability on crash report ownership change in Apport allows for a possible privilege escalation opportunity. If fs.protected_symlinks is disabled, this can be exploited between the os.open and os.chown calls when the Apport cron script clears out crash files of size 0. A symlink with the same name as the deleted file can then be created upon which chown will be called, changing the file owner to root. Fixed in versions 2.20.1-0ubuntu2.23, 2.20.9-0ubuntu7.14, 2.20.11-0ubuntu8.8 and 2.20.11-0ubuntu22.
EPSS 0.04% · 11.7th percentile
Risk Scores
EPSS Score
0.04%
11.7th percentile
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Ubuntu:Pro:14.04:LTS | apport | 2.14.1-0ubuntu3.3, 2.12.7-0ubuntu1, 2.12.7-0ubuntu2 |
| Ubuntu:20.04:LTS | apport | 0, 2.20.11-0ubuntu21, 2.20.11-0ubuntu20 |
| Ubuntu:16.04:LTS | apport | 2.20.1-0ubuntu2.18, 2.19.2-0ubuntu3, 2.19.2-0ubuntu4 |
| Ubuntu:18.04:LTS | apport | 2.20.9-0ubuntu4, 2.20.9-0ubuntu5, 2.20.9-0ubuntu7 |
Exploit Intelligence
- https://bugs.launchpad.net/ubuntu/+source/apport/+bug/1862933 (nist-nvd)
- https://usn.ubuntu.com/4315-1/ (circl)
- USN-4315-2 (circl)
Timeline
- Apr 2, 2020 CVE Published
- Apr 14, 2021 EPSS Score
- Jun 23, 2021 EPSS Score
- Aug 24, 2021 EPSS Score
- Oct 26, 2021 EPSS Score
- Jan 6, 2022 EPSS Score
- Feb 4, 2022 EPSS Score
- Feb 28, 2022 EPSS Score
- Apr 1, 2022 EPSS Score
- May 1, 2022 EPSS Score
- Jul 3, 2022 EPSS Score
- Sep 4, 2022 EPSS Score
References
- https://ubuntu.com/security/CVE-2020-8833 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-2020-8833 third-party-advisory