CVE-2019-6991 Explained : Impact and Mitigation

ZoneMinder through version 1.32.3 is affected by a Stack-based buffer overflow vulnerability in the zmLoadUser() function of the zmu binary. This vulnerability allows unauthorized attackers to execute arbitrary code by providing a username that exceeds the allowed length.

Understanding CVE-2019-6991

This CVE identifies a critical security issue in ZoneMinder software that can be exploited by attackers to run malicious code.

What is CVE-2019-6991?

The CVE-2019-6991 vulnerability is a well-known Stack-based buffer overflow in the zmLoadUser() function of the zmu binary in ZoneMinder through version 1.32.3. It enables unauthorized individuals to execute arbitrary code by submitting a username that surpasses the permitted length.

The Impact of CVE-2019-6991

The vulnerability poses a severe risk as attackers can exploit it to execute unauthorized code on affected systems, potentially leading to system compromise, data theft, or further exploitation of the compromised system.

Technical Details of CVE-2019-6991

ZoneMinder through version 1.32.3 is susceptible to a critical buffer overflow vulnerability that allows attackers to execute arbitrary code.

Vulnerability Description

The zmLoadUser() function in zm_user.cpp of the zmu binary in ZoneMinder through version 1.32.3 suffers from a Stack-based buffer overflow vulnerability, enabling unauthorized attackers to execute arbitrary code by providing an excessively long username.

Affected Systems and Versions

Systems running ZoneMinder software up to version 1.32.3 are vulnerable to this exploit.

Exploitation Mechanism

Attackers can exploit this vulnerability by submitting a username that exceeds the allowed length, triggering a buffer overflow and potentially executing malicious code.

Mitigation and Prevention

To safeguard systems from CVE-2019-6991, immediate actions and long-term security practices are essential.

Immediate Steps to Take

Update ZoneMinder software to a patched version that addresses the buffer overflow vulnerability.
Implement network security measures to restrict unauthorized access to the affected systems.

Long-Term Security Practices

Regularly monitor and update software to mitigate potential vulnerabilities.
Conduct security assessments and penetration testing to identify and address security gaps.

Patching and Updates

Apply security patches provided by ZoneMinder promptly to fix the buffer overflow vulnerability and enhance system security.