CVE-2018-14424 : Exploit Details and Defense Strategies

A vulnerability exists in the GDM daemon version 3.29.1 and earlier, allowing a local attacker to trigger a use-after-free situation via a specially crafted sequence of D-Bus method calls.

Understanding CVE-2018-14424

This CVE involves a flaw in the GDM daemon that can be exploited by a malicious actor with local access.

What is CVE-2018-14424?

The vulnerability arises from the daemon's failure to correctly unexport display objects from its D-Bus interface upon destruction, leading to potential denial of service or code execution.

The Impact of CVE-2018-14424

Exploitation of this vulnerability can result in a use-after-free scenario, enabling a local attacker to execute a sequence of D-Bus method calls to disrupt services or potentially execute arbitrary code.

Technical Details of CVE-2018-14424

The technical aspects of the vulnerability are as follows:

Vulnerability Description

The GDM daemon through version 3.29.1 does not properly handle the unexporting of display objects from its D-Bus interface upon destruction, allowing for a use-after-free condition.

Affected Systems and Versions

Affected Version: GDM daemon version 3.29.1 and earlier

Exploitation Mechanism

A local attacker can exploit the vulnerability by executing a specific sequence of D-Bus method calls, triggering the use-after-free condition.

Mitigation and Prevention

Steps to mitigate and prevent exploitation of CVE-2018-14424:

Immediate Steps to Take

Apply security updates provided by the vendor promptly.
Monitor vendor advisories and security mailing lists for patches.
Restrict access to vulnerable systems to trusted users only.

Long-Term Security Practices

Implement the principle of least privilege to limit access rights for users.
Regularly update and patch software to address known vulnerabilities.

Patching and Updates

Install the latest security updates and patches released by the GDM vendor to address the vulnerability.