CVE-2020-8833
published 2020-04-22CVE-2020-8833: Time-of-check Time-of-use Race Condition vulnerability on crash report ownership change in Apport allows for a possible privilege escalation opportunity. If…
medium4.7CVSS 3.1
AVLACHPRLUINSUCHINAN
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
11 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| apport_project | apport | >= 0 < 2.20.1-0ubuntu2.23 | 2.20.1-0ubuntu2.23 |
| apport_project | apport | >= 0 < 2.20.9-0ubuntu7.14 | 2.20.9-0ubuntu7.14 |
| apport_project | apport | >= 0 < 2.20.11-0ubuntu22 | 2.20.11-0ubuntu22 |
| apport_project | apport | >= 0 < 2.14.1-0ubuntu3.29+esm4 | 2.14.1-0ubuntu3.29+esm4 |
| canonical | apport | >= 2.20.1 < 2.20.1-0ubuntu2.23 | 2.20.1-0ubuntu2.23 |
| canonical | apport | >= 2.20.11 < 2.20.11-0ubuntu8.8 | 2.20.11-0ubuntu8.8 |
| canonical | apport | >= 2.20.9 < 2.20.9-0ubuntu7.14 | 2.20.9-0ubuntu7.14 |
| canonical | ubuntu_linux | — | — |
| canonical | ubuntu_linux | — | — |
| canonical | ubuntu_linux | — | — |
| canonical | ubuntu_linux | — | — |
CVSS provenance
nvdv3.14.7MEDIUMCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
osv5.5MEDIUM