What’s Vulnerable › Vulnerabilities

CVE-2020-15702: TOCTOU in apport

• Severity: high (CVSS 7.0 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-08-06 · updated 2026-06-17
• Weakness: CWE-367

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.

Affected products

• Canonical apport: 2.20.11-0ubuntu8, 2.20.11-0ubuntu9, 2.20.11-0ubuntu10, 2.20.11-0ubuntu11, 2.20.11-0ubuntu12, 2.20.11-0ubuntu13 (+94)
• Canonical Ubuntu Linux: 14.04

References

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

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