CVE-2018-7738 : Security Advisory and Response
Learn about CVE-2018-7738, a vulnerability in util-linux before version 2.32-rc1 allowing local users to elevate privileges. Find out the impact, affected systems, exploitation mechanism, and mitigation steps.
CVE-2018-7738 was published on March 6, 2018, highlighting a vulnerability in util-linux before version 2.32-rc1. This vulnerability allowed local users to elevate their privileges by exploiting bash-completion/umount functionality.
Understanding CVE-2018-7738
This CVE entry addresses a security issue in util-linux that could be exploited by local users to gain elevated privileges.
What is CVE-2018-7738?
Prior to version 2.32-rc1 of util-linux, a vulnerability existed that enabled local users to execute arbitrary shell commands by manipulating mountpoint names and running umount commands as a different user, leading to privilege escalation.
The Impact of CVE-2018-7738
The vulnerability allowed local users to elevate their privileges, particularly when logged in as root and using the tab key for autocompletion after entering the umount command.
Technical Details of CVE-2018-7738
This section provides more in-depth technical insights into the vulnerability.
Vulnerability Description
The vulnerability in util-linux before version 2.32-rc1 allowed local users to embed shell commands in mountpoint names, which could be exploited during umount commands to gain elevated privileges.
Affected Systems and Versions
- Product: N/A
- Vendor: N/A
- Vulnerable Version: N/A
Exploitation Mechanism
Local users could exploit the vulnerability by inserting shell commands in mountpoint names and executing umount commands as a different user, leveraging the bash-completion/umount functionality.
Mitigation and Prevention
To address and prevent the exploitation of CVE-2018-7738, consider the following steps:
Immediate Steps to Take
- Upgrade util-linux to version 2.32-rc1 or later to mitigate the vulnerability.
- Avoid running commands with elevated privileges unnecessarily.
Long-Term Security Practices
- Implement the principle of least privilege to restrict user access.
- Regularly monitor and audit user activities to detect suspicious behavior.
Patching and Updates
- Stay informed about security advisories from vendors and promptly apply patches to secure systems.