Disclosure Date 2020/08/10


Canonical Ubuntu apport Time-Of-Check Time-Of-Use Privilege Escalation Vulnerability

apport における Time-of-check Time-of-use (TOCTOU) 競合状態の脆弱性


Ryota Shiga (@Ga_ryo_)


This vulnerability allows local attackers to escalate privileges on affected installations of Canonical Ubuntu. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability.

The specific flaw exists within the apport package. The issue results from the lack of proper locking when performing operations on a file. An attacker can leverage this vulnerability to escalate privileges and execute code in the context of root. https://www.zerodayinitiative.com/advisories/ZDI-20-979/