Ubuntu.comUB:CVE-2018-7738CVE-2018-7738
7.8 High
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.2 High
CVSS2
Access Vector
LOCAL
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:L/AC:L/Au:N/C:C/I:C/A:C
0.0004 Low
EPSS
Percentile
5.2%
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.
Bugs
- <http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=892179>
- <https://github.com/karelzak/util-linux/issues/539>
Notes
| Author | Note |
|---|---|
| sbeattie | bash completion for umount moved from bash-completion to util-linux in util-linux 2.28-1 |
| mdeslaur | script in xenial bash-completion package isn’t vulnerable bash-completion package in bionic+ doesn’t contain the umount helper |
| OS | Version | Architecture | Package | Version | Filename |
|---|---|---|---|---|---|
| ubuntu | 18.04 | noarch | util-linux | < 2.31.1-0.4ubuntu3.7 | UNKNOWN |
Related
7.8 High
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.2 High
CVSS2
Access Vector
LOCAL
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:L/AC:L/Au:N/C:C/I:C/A:C
0.0004 Low
EPSS
Percentile
5.2%