CVE-2020-15702
TOCTOU Race Condition vulnerability in apport allows a local attacker to escalate privileges and execute arbitrary code.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.50%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 7.0 HIGHCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.50% probability · 41th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-367
- Affected
- canonical/apport · canonical/ubuntu linux
- Source
- security@ubuntu.com
References
- https://usn.ubuntu.com/4449-1Vendor Advisory
- https://usn.ubuntu.com/4449-1/Vendor Advisory
- https://usn.ubuntu.com/4449-2/Vendor Advisory
- https://www.zerodayinitiative.com/advisories/ZDI-20-979/Third Party Advisory, VDB Entry
- http://seclists.org/fulldisclosure/2025/Jun/9
- https://usn.ubuntu.com/4449-1Vendor Advisory
- https://usn.ubuntu.com/4449-1/Vendor Advisory
- https://usn.ubuntu.com/4449-2/Vendor Advisory
- https://www.zerodayinitiative.com/advisories/ZDI-20-979/Third Party Advisory, VDB Entry
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.