CVE-2018-7738
First published: Tue Mar 06 2018(Updated: )
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.
Credit: cve@mitre.org cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Kernel Util-linux | <=2.31 | |
| ubuntu/util-linux | <2.31.1-0.4ubuntu3.7 | 2.31.1-0.4ubuntu3.7 |
| ubuntu/util-linux | <2.31.1-0.5 | 2.31.1-0.5 |
| debian/bash-completion | <=1:2.11-2<=1:2.11-6<=1:2.14.0-1 | |
| debian/util-linux | 2.36.1-8+deb11u2 2.38.1-5+deb12u1 2.40.2-7 2.40.2-8 |
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Reference Links
- https://github.com/karelzak/util-linux/commit/75f03badd7ed9f1dd951863d75e756883d3acc55#diff-a47601b5dbce9dc06c3af1deb02758c7
- https://security-tracker.debian.org/tracker/CVE-2018-7738
- https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=892179
- 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
- https://launchpad.net/bugs/cve/CVE-2018-7738
- https://ubuntu.com/security/notices/USN-4512-1
- https://www.cve.org/CVERecord?id=CVE-2018-7738
- https://nvd.nist.gov/vuln/detail/CVE-2018-7738
- https://ubuntu.com/security/CVE-2018-7738
Frequently Asked Questions
What is CVE-2018-7738?
CVE-2018-7738 is a vulnerability in util-linux before 2.32-rc1 that allows local users to gain privileges by embedding shell commands in a mountpoint name, which is mishandled during a umount command.
How can an attacker exploit CVE-2018-7738?
An attacker can exploit CVE-2018-7738 by creating a malicious mountpoint name with embedded shell commands, and then triggering a umount command as a different user.
What is the severity of CVE-2018-7738?
CVE-2018-7738 has a severity rating of 7.8 (high).
Which versions of util-linux are affected by CVE-2018-7738?
Versions before 2.32-rc1 of util-linux are affected by CVE-2018-7738.
Is there a fix available for CVE-2018-7738?
Yes, the fix for CVE-2018-7738 is included in version 2.32-rc1 of util-linux.
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