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.
Advisories
Source ID Title
EUVD EUVD EUVD-2020-29676 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.
Ubuntu USN Ubuntu USN USN-4315-1 Apport vulnerabilities
Ubuntu USN Ubuntu USN USN-4315-2 Apport vulnerabilities
Fixes

Solution

No solution given by the vendor.


Workaround

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History

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cve-icon MITRE

Status: PUBLISHED

Assigner: canonical

Published:

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 : Modified

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

Modified: 2024-11-21T05:39:31.937

Link: CVE-2020-8833

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.