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.
The product checks the state of a resource before using that resource, but the resource's state can change between the check and the use in a way that invalidates the results of the check. This can cause the product to perform invalid actions when the resource is in an unexpected state.
| Link | Tags |
|---|---|
| https://usn.ubuntu.com/4449-1 | vendor advisory |
| https://usn.ubuntu.com/4449-1/ | vendor advisory |
| https://www.zerodayinitiative.com/advisories/ZDI-20-979/ | third party advisory vdb entry |
| https://usn.ubuntu.com/4449-2/ | vendor advisory |