CVE-2019-13956 Explained : Impact and Mitigation

Discuz!ML versions 3.2 to 3.4 are vulnerable to remote code execution via a language cookie manipulation.

Understanding CVE-2019-13956

Discuz!ML versions 3.2 to 3.4 allow attackers to execute PHP code by altering the language cookie.

What is CVE-2019-13956?

The vulnerability in Discuz!ML versions 3.2 to 3.4 enables remote attackers to run arbitrary PHP code by modifying the language cookie.

The Impact of CVE-2019-13956

Exploiting this vulnerability allows attackers to execute PHP code of their choice, potentially leading to unauthorized access and data theft.

Technical Details of CVE-2019-13956

Discuz!ML versions 3.2 to 3.4 are susceptible to remote code execution through a specific cookie manipulation.

Vulnerability Description

Attackers can exploit the vulnerability by changing the value of the language cookie, allowing them to execute PHP code.

Affected Systems and Versions

Discuz!ML versions 3.2 to 3.4

Exploitation Mechanism

Attackers modify the language cookie, specifically changing the value of '4gH4_0df5_language' to execute PHP code.
This method is applicable when the random prefix '4gH4_0df5_' is used.

Mitigation and Prevention

It is crucial to take immediate steps to secure systems and prevent exploitation of CVE-2019-13956.

Immediate Steps to Take

Disable unnecessary features and plugins to reduce attack surface.
Implement strong input validation to prevent malicious input.
Regularly monitor and audit system logs for suspicious activities.

Long-Term Security Practices

Keep software up to date with the latest security patches.
Conduct regular security assessments and penetration testing.
Educate users and administrators about safe computing practices.

Patching and Updates

Apply patches provided by the vendor to address the vulnerability in Discuz!ML versions 3.2 to 3.4.