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CVE-2018-7738

Status Candidate

Overview

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.

Related Files

Ubuntu Security Notice USN-4512-1
Posted Sep 17, 2020
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4512-1 - It was discovered that the umount bash completion script shipped in util-linux incorrectly handled certain mountpoints. If a local attacker were able to create arbitrary mountpoints, another user could be tricked into executing arbitrary code when attempting to run the umount command with bash completion.

tags | advisory, arbitrary, local, bash
systems | linux, ubuntu
advisories | CVE-2018-7738
SHA-256 | 721b596b39c552a83413d7c73f21fa99895259ca2b06e7ee12a54af082236b77
Debian Security Advisory 4134-1
Posted Mar 10, 2018
Authored by Debian | Site debian.org

Debian Linux Security Advisory 4134-1 - Bjorn Bosselmann discovered that the umount bash completion from util-linux does not properly handle embedded shell commands in a mountpoint name. An attacker with rights to mount filesystems can take advantage of this flaw for privilege escalation if a user (in particular root) is tricked into using the umount completion while a specially crafted mount is present.

tags | advisory, shell, root, bash
systems | linux, debian
advisories | CVE-2018-7738
SHA-256 | 83b60daf457134ad19dfdbe3b0fbb827b9872307ec8d73874d18ff1123086aa2
Gentoo Linux Security Advisory 201803-02
Posted Mar 7, 2018
Authored by Gentoo | Site security.gentoo.org

Gentoo Linux Security Advisory 201803-2 - A vulnerability was discovered in util-linux, which could potentially lead to the execution of arbitrary code. Versions less than 2.30.2-r1 are affected.

tags | advisory, arbitrary
systems | linux, gentoo
advisories | CVE-2018-7738
SHA-256 | c53758085963969a5d8d1cabb18a0b7ba4de041931b130bf072ccc778a2dae8b
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