CVE-2020-8833
Apport race condition in crash report permissions
MEDIUM 4.7EPSS 0.3%
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.
- Affected
- Canonical · Apport
- CVSS v3.1 NVD
- 4.7 MEDIUM
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N - CVSS v3.1 UBUNTU
- 5.6 MEDIUM
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N - CVSS v2.0 NVD
- 1.9 LOW
AV:L/AC:M/Au:N/C:P/I:N/A:N - EPSS
- 0.34% chance of exploitation in the next 30 days, 26th percentile
- Published
- 2020-04-22
- Updated
- 2024-09-16