CVE-2020-10174
Published: 5 March 2020
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.
Priority
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 7.0 |
| Attack vector | Local |
| Attack complexity | High |
| Privileges required | Low |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | High |
| Integrity impact | High |
| Availability impact | High |
| Vector | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H |
References
- https://bugzilla.suse.com/show_bug.cgi?id=1165802
- https://github.com/teejee2008/timeshift/commit/335b3d5398079278b8f7094c77bfd148b315b462
- https://github.com/teejee2008/timeshift/releases/tag/v20.03
- https://ubuntu.com/security/notices/USN-4312-1
- https://www.cve.org/CVERecord?id=CVE-2020-10174
- NVD
- Launchpad
- Debian