CVE-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 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.
References
Link Resource
https://bugs.launchpad.net/ubuntu/+source/apport/+bug/1862933 Exploit Third Party Advisory
https://usn.ubuntu.com/4315-1/ Third Party Advisory
https://usn.ubuntu.com/4315-2/ Third Party Advisory
Configurations

Configuration 1 (hide)

OR cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:esm:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:19.10:*:*:*:*:*:*:*

Configuration 2 (hide)

cpe:2.3:a:apport_project:apport:-:*:*:*:*:*:*:*

History

No history.

Information

Published : 2020-04-22 22:15

Updated : 2024-02-28 17:47


NVD link : CVE-2020-8833

Mitre link : CVE-2020-8833

CVE.ORG link : CVE-2020-8833


JSON object : View

Products Affected

canonical

  • ubuntu_linux

apport_project

  • apport
CWE
CWE-367

Time-of-check Time-of-use (TOCTOU) Race Condition