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.
History

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cve-icon MITRE

Status: PUBLISHED

Assigner: canonical

Published: 2020-04-22T21:15:18.859159Z

Updated: 2024-09-16T20:53:27.660Z

Reserved: 2020-02-10T00:00:00

Link: CVE-2020-8833

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Analyzed

Published: 2020-04-22T22:15:12.577

Modified: 2022-10-07T15:14:27.967

Link: CVE-2020-8833

cve-icon Redhat

No data.