CVEs-PoC/2020/CVE-2020-10174.md

CVE-2020-10174

Description

init_tmp in TeeJee.FileSystem.vala in Timeshift before 20.03 unsafely reuses a preexisting temporary directory in the predictable location /tmp/timeshift. It follows symlinks in this location or uses directories owned by unprivileged users. Because Timeshift also executes scripts under this location, an attacker can attempt to win a race condition to replace scripts created by Timeshift with attacker-controlled scripts. Upon success, an attacker-controlled script is executed with full root privileges. This logic is practically always triggered when Timeshift runs regardless of the command-line arguments used.

POC

Reference

• http://www.openwall.com/lists/oss-security/2020/03/06/3
• https://bugzilla.suse.com/show_bug.cgi?id=1165802

Github

No PoCs found on GitHub currently.