CVE-2018-25078 : Security Advisory and Response

CVE-2018-25078 is a vulnerability found in the man-db package on Gentoo systems that allows local users to gain root privileges. The issue lies in the execution of /usr/bin/mandb, which is performed by root even though it is not owned by root.

Understanding CVE-2018-25078

This CVE identifies a privilege escalation vulnerability on Gentoo systems due to improper ownership and permissions within the man-db package.

What is CVE-2018-25078?

The vulnerability in man-db version prior to 2.8.5 allows local users with access to the man user account to escalate their privileges to root level by exploiting the setuid and setgid bits.

The Impact of CVE-2018-25078

This vulnerability enables unauthorized users to gain root privileges on the system, potentially leading to unauthorized access, data manipulation, or further compromise of the affected system.

Technical Details of CVE-2018-25078

The technical aspects of the CVE-2018-25078 vulnerability are as follows:

Vulnerability Description

Local users with access to the man user account can exploit the improper ownership and permissions in the man-db package to escalate privileges.

Affected Systems and Versions

Vendor: n/a
Product: n/a
Versions: All versions prior to 2.8.5 are affected.

Exploitation Mechanism

By manipulating the setuid and setgid bits in /usr/bin/mandb, local users can execute commands with root privileges.

Mitigation and Prevention

To address CVE-2018-25078 and enhance system security, consider the following mitigation strategies:

Immediate Steps to Take

Update man-db to version 2.8.5 or later to patch the vulnerability.
Restrict access to the man user account to authorized personnel only.

Long-Term Security Practices

Regularly review and update file permissions and ownership on critical system binaries.
Implement the principle of least privilege to limit user access and permissions.

Patching and Updates

Apply security patches and updates promptly to ensure that known vulnerabilities are addressed and system security is maintained.