CVE-2019-6256 Explained : Impact and Mitigation

Live555 Media Server 0.93 is affected by a Denial of Service (DoS) vulnerability in the LIVE555 Streaming Media libraries, specifically in the RTSPServer module. This vulnerability can lead to a crash in the handleHTTPCmd_TunnelingPOST function, triggered by x-sessioncookie HTTP headers in both GET and POST requests within the same TCP session due to incorrect virtual function pointer usage.

Understanding CVE-2019-6256

This CVE involves a DoS vulnerability in Live555 Media Server 0.93.

What is CVE-2019-6256?

The vulnerability in Live555 Media Server 0.93 leads to a DoS issue in the LIVE555 Streaming Media libraries, causing a crash in the RTSPServer module.

The Impact of CVE-2019-6256

The vulnerability can result in a Denial of Service (DoS) condition, potentially disrupting the availability of the affected system.

Technical Details of CVE-2019-6256

Live555 Media Server 0.93 is susceptible to a specific type of DoS attack.

Vulnerability Description

The vulnerability arises from the mishandling of x-sessioncookie HTTP headers in GET and POST requests within the same TCP session, leading to a crash in the handleHTTPCmd_TunnelingPOST function.

Affected Systems and Versions

Product: Live555 Media Server 0.93
Vendor: N/A
Versions: N/A

Exploitation Mechanism

The vulnerability is exploited by sending x-sessioncookie HTTP headers in both GET and POST requests within the same TCP session, causing a crash due to incorrect virtual function pointer usage.

Mitigation and Prevention

It is crucial to take immediate steps to address and prevent the exploitation of CVE-2019-6256.

Immediate Steps to Take

Apply security patches provided by the vendor promptly.
Disable RTSP-over-HTTP tunneling if not required.
Monitor network traffic for any suspicious activity related to x-sessioncookie headers.

Long-Term Security Practices

Regularly update and patch software to mitigate known vulnerabilities.
Implement network segmentation to limit the impact of potential attacks.

Patching and Updates

Stay informed about security updates and advisories from the vendor.
Keep the Live555 Media Server software up to date with the latest patches and fixes.