Description (CNA)
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 (CNA)
| Vendor / product | Versions |
|---|---|
| Canonical / Apport | affected 2.20.1 before 2.20.1-0ubuntu2.23; affected 2.20.9 before 2.20.9-0ubuntu7.14; affected 2.20.11 before 2.20.11-0ubuntu8.8 |
CWE
CWE-367
References
- https://usn.ubuntu.com/4315-1/
- https://bugs.launchpad.net/ubuntu/+source/apport/+bug/1862933
- https://usn.ubuntu.com/4315-2/
ADP enrichment
No English description supplied.