CVE-2020-15702

TOCTOU in apport

State: Published
Severity: 7.0 High
Published: Aug 6, 2020
Updated: Nov 3, 2025
Reserved: Jul 14, 2020

Description

TOCTOU Race Condition vulnerability in apport allows a local attacker to escalate privileges and execute arbitrary code. An attacker may exit the crashed process and exploit PID recycling to spawn a root process with the same PID as the crashed process, which can then be used to escalate privileges. Fixed in 2.20.1-0ubuntu2.24, 2.20.9 versions prior to 2.20.9-0ubuntu7.16 and 2.20.11 versions prior to 2.20.11-0ubuntu27.6. Was ZDI-CAN-11234.

Scores

CVSS	Score	Vector	Source
3.1	7.0 High	CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H	canonical

Weaknesses

CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition

Affected Products

Product	Versions
apportCanonical	2.20.1 to before 2.20.1-0ubuntu2.24Affected 2.20.9 to before 2.20.9-0ubuntu7.16Affected 2.20.11 to before 2.20.11-0ubuntu27.6Affected

References

https://usn.ubuntu.com/4449-1
USN-4449-1vendor-advisory
https://www.zerodayinitiative.com/advisories/ZDI-20-979/
USN-4449-2vendor-advisory
http://seclists.org/fulldisclosure/2025/Jun/9

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