CVE-2020-10174

NameCVE-2020-10174
Descriptioninit_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.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
NVD severitymedium
Debian Bugs953385

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
timeshift (PTS)buster19.01+ds-2vulnerable
bullseye, sid20.03+ds-2fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
timeshiftsource(unstable)20.03+ds-1953385

Notes

[buster] - timeshift <no-dsa> (Will be fixed via point release)
https://www.openwall.com/lists/oss-security/2020/03/06/3
https://bugzilla.suse.com/show_bug.cgi?id=1165802
https://github.com/teejee2008/timeshift/commit/335b3d5398079278b8f7094c77bfd148b315b462

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