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CVE-2018-7738

7.8 · HIGH

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 Bas…

Published Mar 7, 2018EPSS 0.43%

Overview

CVE-2018-7738 is a high-severity vulnerability. It was published on March 7, 2018 and has a CVSS 3.0 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.0 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refwww.securityfocus.com/bid/103367Refbugs.debian.org/892179GitHubgithub.com/karelzak/util-linux/commit/75f03badd7ed9f1dd951863d75e756883d3acc55GitHubgithub.com/karelzak/util-linux/issues/539Refusn.ubuntu.com/4512-1/Refwww.debian.org/security/2018/dsa-4134Refwww.securityfocus.com/bid/103367Refbugs.debian.org/892179GitHubgithub.com/karelzak/util-linux/commit/75f03badd7ed9f1dd951863d75e756883d3acc55GitHubgithub.com/karelzak/util-linux/issues/539

How CyberStrike helps

Frequently asked questions

What is CVE-2018-7738?

CVE-2018-7738 is a high-severity vulnerability. It was published on March 7, 2018 and has a CVSS 3.0 base score of 7.8 (HIGH).

How severe is CVE-2018-7738?

This vulnerability has a CVSS 3.0 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2018-7738?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2018-7738?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2018-7738 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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