CVE-2020-10174
init_tmp in TeeJee.FileSystem.vala in Timeshift before 20.03 unsafely reuses a preexisting temporary directory in the predictable location /tmp/timeshift.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.28%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- 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
- 0.28% probability · 20th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-59, CWE-362
- Affected
- timeshift project/timeshift · fedoraproject/fedora · canonical/ubuntu linux
- Source
- cve@mitre.org
References
- http://www.openwall.com/lists/oss-security/2020/03/06/3Mailing List, Third Party Advisory
- https://bugzilla.suse.com/show_bug.cgi?id=1165802Issue Tracking, Third Party Advisory
- https://github.com/teejee2008/timeshift/commit/335b3d5398079278b8f7094c77bfd148b315b462Patch, Third Party Advisory
- https://github.com/teejee2008/timeshift/releases/tag/v20.03Release Notes, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AAOFXT64CEUMJE3723JDJWTEQWQUCYMD/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SXDEPC52G46U6I7GLQNFLZXVSM7V2HYY/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TXXYQFSZ5P6ZMNFIDBAQKBFZIR2T7ZLL/
- https://usn.ubuntu.com/4312-1/Third Party Advisory
- http://www.openwall.com/lists/oss-security/2020/03/06/3Mailing List, Third Party Advisory
- https://bugzilla.suse.com/show_bug.cgi?id=1165802Issue Tracking, Third Party Advisory
- https://github.com/teejee2008/timeshift/commit/335b3d5398079278b8f7094c77bfd148b315b462Patch, Third Party Advisory
- https://github.com/teejee2008/timeshift/releases/tag/v20.03Release Notes, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AAOFXT64CEUMJE3723JDJWTEQWQUCYMD/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SXDEPC52G46U6I7GLQNFLZXVSM7V2HYY/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TXXYQFSZ5P6ZMNFIDBAQKBFZIR2T7ZLL/
- https://usn.ubuntu.com/4312-1/Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.