Vulnerability Details : 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. 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.
Products affected by CVE-2020-10174
- cpe:2.3:o:canonical:ubuntu_linux:19.10:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:*
- cpe:2.3:a:timeshift_project:timeshift:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2020-10174
0.05%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 12 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2020-10174
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
6.9
|
MEDIUM | AV:L/AC:M/Au:N/C:C/I:C/A:C |
3.4
|
10.0
|
NIST | |
|
7.0
|
HIGH | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H |
1.0
|
5.9
|
NIST |
CWE ids for CVE-2020-10174
-
The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.Assigned by: nvd@nist.gov (Primary)
-
The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.Assigned by: nvd@nist.gov (Primary)
References for CVE-2020-10174
-
https://github.com/teejee2008/timeshift/releases/tag/v20.03
Release v20.03 · teejee2008/timeshift · GitHubRelease Notes;Third Party Advisory
-
https://github.com/teejee2008/timeshift/commit/335b3d5398079278b8f7094c77bfd148b315b462
Change TEMP_DIR permissions and path; Cleanup on exit; · teejee2008/timeshift@335b3d5 · GitHubPatch;Third Party Advisory
-
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/SXDEPC52G46U6I7GLQNFLZXVSM7V2HYY/
[SECURITY] Fedora 31 Update: timeshift-20.03-1.fc31 - package-announce - Fedora Mailing-ListsMailing List;Third Party Advisory
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https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/AAOFXT64CEUMJE3723JDJWTEQWQUCYMD/
[SECURITY] Fedora 30 Update: timeshift-20.03-1.fc30 - package-announce - Fedora Mailing-ListsMailing List;Third Party Advisory
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http://www.openwall.com/lists/oss-security/2020/03/06/3
oss-security - CVE-2020-10174: timeshift: arbitrary local code execution due to unsafe usage of temporary directory in /tmp/timeshiftMailing List;Third Party Advisory
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https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/TXXYQFSZ5P6ZMNFIDBAQKBFZIR2T7ZLL/
[SECURITY] Fedora 32 Update: timeshift-20.03-1.fc32 - package-announce - Fedora Mailing-ListsMailing List;Third Party Advisory
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https://bugzilla.suse.com/show_bug.cgi?id=1165802
Bug 1165802 – VUL-0: timeshift: arbitrary local code execution due to unsafe usage of temporary directory in /tmp/timeshiftIssue Tracking;Third Party Advisory
-
https://usn.ubuntu.com/4312-1/
USN-4312-1: Timeshift vulnerability | Ubuntu security notices | UbuntuThird Party Advisory
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