CVE-2018-7738 Information

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.

CVSS Vector

CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Reference

http://www.securityfocus.com/bid/103367 https://bugs.debian.org/892179 https://github.com/karelzak/util-linux/commit/75f03badd7ed9f1dd951863d75e756883d3acc55 https://github.com/karelzak/util-linux/issues/539 https://usn.ubuntu.com/4512-1/ https://www.debian.org/security/2018/dsa-4134

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

7.8