CVE-2020-10174: Race Condition
First published: Thu Mar 05 2020(Updated: )
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.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| ubuntu/timeshift | <19.01+ | 19.01+ |
| debian/timeshift | 20.11.1-1 22.11.2-1 24.06.2-1 | |
| Timeshift Project | <20.03 | |
| Fedora | =30 | |
| Fedora | =31 | |
| Fedora | =32 | |
| Ubuntu Linux | =19.10 |
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Reference Links
- 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
- http://www.openwall.com/lists/oss-security/2020/03/06/3
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/SXDEPC52G46U6I7GLQNFLZXVSM7V2HYY/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/TXXYQFSZ5P6ZMNFIDBAQKBFZIR2T7ZLL/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/AAOFXT64CEUMJE3723JDJWTEQWQUCYMD/
- https://usn.ubuntu.com/4312-1/
- https://launchpad.net/bugs/cve/CVE-2020-10174
- https://www.openwall.com/lists/oss-security/2020/03/06/3
- https://security-tracker.debian.org/tracker/CVE-2020-10174
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TXXYQFSZ5P6ZMNFIDBAQKBFZIR2T7ZLL/
- 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/AAOFXT64CEUMJE3723JDJWTEQWQUCYMD/
- https://ubuntu.com/security/notices/USN-4312-1
- https://www.cve.org/CVERecord?id=CVE-2020-10174
- https://nvd.nist.gov/vuln/detail/CVE-2020-10174
- https://ubuntu.com/security/CVE-2020-10174
Frequently Asked Questions
What is the severity of CVE-2020-10174?
CVE-2020-10174 has a medium severity rating due to its potential to allow unauthorized actions through symlink attacks.
How do I fix CVE-2020-10174?
To fix CVE-2020-10174, you should update Timeshift to version 20.03 or later.
What software is affected by CVE-2020-10174?
CVE-2020-10174 affects Timeshift versions below 20.03 on Ubuntu, Debian, and Fedora systems.
What conditions lead to CVE-2020-10174 exploitation?
Exploitation of CVE-2020-10174 can occur when Timeshift reuses a predictable temporary directory that can be manipulated by unprivileged users.
What are the potential consequences of CVE-2020-10174?
The potential consequences of CVE-2020-10174 include unauthorized execution of scripts that could compromise system security.
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