CVE-2020-8833
Last modified
CVE-2020-8833 is a medium-severity vulnerability rated 4.7/10 on the CVSS scale. 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. EPSS estimates a 0.34% chance of exploitation in the next 30 days.
Description
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.
Metrics
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Canonical | Ubuntu Linux | 14.04 |
| Canonical | Ubuntu Linux | 16.04 |
| Canonical | Ubuntu Linux | 18.04 |
| Canonical | Ubuntu Linux | 19.10 |
| Apport Project | Apport | All versions |
References
- https://bugs.launchpad.net/ubuntu/+source/apport/+bug/1862933Exploit, Third Party Advisory
- https://usn.ubuntu.com/4315-1/Third Party Advisory
- https://usn.ubuntu.com/4315-2/Third Party Advisory
- https://bugs.launchpad.net/ubuntu/+source/apport/+bug/1862933Exploit, Third Party Advisory
- https://usn.ubuntu.com/4315-1/Third Party Advisory
- https://usn.ubuntu.com/4315-2/Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
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