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CVE-2020-8833

Description

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.

Risk Information

Base Score
4.7
MODERATE
Vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
EPSS Score
Exploitation Probability
0.034

Associated Vulnerability

VulnerabilityOS Platform
automatically generate crash reports for debugging (USN-4315-1) apport_2.20.1-0ubuntu2.23_all.debLinux
automatically generate crash reports for debugging (USN-4315-1) apport_2.20.11-0ubuntu8.8_all.debLinux
automatically generate crash reports for debugging (USN-4315-1) apport_2.20.9-0ubuntu7.14_all.debLinux
automatically generate crash reports for debugging (USN-4315-1) python-apport_2.20.1-0ubuntu2.23_all.debLinux
automatically generate crash reports for debugging (USN-4315-1) python-apport_2.20.11-0ubuntu8.8_all.debLinux
automatically generate crash reports for debugging (USN-4315-1) python-apport_2.20.9-0ubuntu7.14_all.debLinux
automatically generate crash reports for debugging (USN-4315-1) python3-apport_2.20.1-0ubuntu2.23_all.debLinux
automatically generate crash reports for debugging (USN-4315-1) python3-apport_2.20.11-0ubuntu8.8_all.debLinux
automatically generate crash reports for debugging (USN-4315-1) python3-apport_2.20.9-0ubuntu7.14_all.debLinux

Patch Details

No records found

References

https://nvd.nist.gov/vuln/detail/CVE-2023-1234
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-1234