Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Canonical | Ubuntu Linux | 14.04 |
| Apport Project | Apport | - |
Related Weaknesses (CWE)
References
- https://bugs.launchpad.net/ubuntu/+source/apport/+bug/1862933ExploitThird 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/1862933ExploitThird Party Advisory
- https://usn.ubuntu.com/4315-1/Third Party Advisory
- https://usn.ubuntu.com/4315-2/Third Party Advisory
FAQ
What is CVE-2020-8833?
CVE-2020-8833 is a vulnerability with a CVSS score of 5.6 (MEDIUM). 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...
How severe is CVE-2020-8833?
CVE-2020-8833 has been rated MEDIUM with a CVSS base score of 5.6/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2020-8833?
Check the references section above for vendor advisories and patch information. Affected products include: Canonical Ubuntu Linux, Apport Project Apport.