| Name | CVE-2018-7738 |
| Description | In util-linux before 2.32-rc1, bash-completion/umount allows local users to gain privileges by embedding shell commands in a mountpoint name, which is mishandled during a umount command (within Bash) by a different user, as demonstrated by logging in as root and entering umount followed by a tab character for autocompletion. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DSA-4134-1 |
| Debian Bugs | 892179 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| bash-completion (PTS) | jessie | 1:2.1-4 | vulnerable |
| stretch | 1:2.1-4.3 | vulnerable |
| buster | 1:2.8-6 | vulnerable |
| bullseye | 1:2.11-2 | vulnerable |
| bookworm | 1:2.11-6 | vulnerable |
| sid, trixie | 1:2.14.0-2 | vulnerable |
| util-linux (PTS) | jessie, jessie (lts) | 2.26.2+really2.25.2-6+deb8u2 | fixed |
| stretch (security) | 2.29.2-1+deb9u1 | fixed |
| stretch (lts), stretch | 2.29.2-1+deb9u3 | fixed |
| buster (security), buster, buster (lts) | 2.33.1-0.1+deb10u1 | fixed |
| bullseye (security), bullseye | 2.36.1-8+deb11u2 | fixed |
| bookworm | 2.38.1-5+deb12u2 | fixed |
| bookworm (security) | 2.38.1-5+deb12u1 | fixed |
| sid, trixie | 2.40.2-11 | fixed |
The information below is based on the following data on fixed versions.
Notes
[jessie] - util-linux <not-affected> (umount completion added later)
[wheezy] - util-linux <not-affected> (umount completion added later)
Fix in bash-completion's from util-linux:
https://github.com/karelzak/util-linux/commit/75f03badd7ed9f1dd951863d75e756883d3acc55#diff-a47601b5dbce9dc06c3af1deb02758c7
src:util-linux/2.28-1 takes over the umount completion from
src:bash-completion (which in turn starting from 1:2.1-4.3
does not provide the umount completion in the binary packaage)