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Medium severity5.6NVD Advisory· Published Apr 22, 2020· Updated Jun 17, 2026

CVE-2020-8833

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

7
  • Apport Project/Apport
    cpe:2.3:a:apport_project:apport:-:*:*:*:*:*:*:*
  • Canonical/Ubuntu Linux4 versions
    cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:esm:*:*:*+ 3 more
    • 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:*:*:*:*:*:*:*
  • Ubuntu/Apportllm-fuzzy
    Range: 2.20.1-0ubuntu2.23, 2.20.9-0ubuntu7.14, 2.20.11-0ubuntu8.8, 2.20.11-0ubuntu22
  • Canonical/apport-clicpe-rescue
    Range: 2.20.1

Patches

Vulnerability mechanics

References

3

News mentions

0

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