CVE-2020-8833
5.6
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N
Summary
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 Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Canonical | Apport | 2.20.1 < 2.20.1-0ubuntu2.23 | affected |
| Canonical | Apport | 2.20.9 < 2.20.9-0ubuntu7.14 | affected |
| Canonical | Apport | 2.20.11 < 2.20.11-0ubuntu8.8 | affected |
Weaknesses
- CWE-367: CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition
ADP Enrichment
CVE Program Container
Additional References
- https://usn.ubuntu.com/4315-1/
- https://bugs.launchpad.net/ubuntu/+source/apport/+bug/1862933
- https://usn.ubuntu.com/4315-2/
References
- https://usn.ubuntu.com/4315-1/
- https://bugs.launchpad.net/ubuntu/+source/apport/+bug/1862933
- https://usn.ubuntu.com/4315-2/
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