CVE-2018-7738

critical

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.

References

https://www.debian.org/security/2018/dsa-4134

https://usn.ubuntu.com/4512-1/

https://github.com/karelzak/util-linux/issues/539

https://github.com/karelzak/util-linux/commit/75f03badd7ed9f1dd951863d75e756883d3acc55

https://bugs.debian.org/892179

http://www.securityfocus.com/bid/103367

Details

Source: Mitre, NVD

Published: 2018-03-07

Updated: 2020-09-25

Risk Information

CVSS v2

Base Score: 7.2

Vector: CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C

Severity: High

CVSS v3

Base Score: 7.8

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

Severity: High

CVSS v4

Base Score: 9.3

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Severity: Critical