CVE-2018-16657 : Vulnerability Insights and Analysis

Kamailio versions prior to 5.0.7 and 5.1.x before 5.1.4 are vulnerable to a crash when receiving a manipulated SIP message containing an invalid Via header. This crash occurs due to the absence of proper input validation in the crcitt_string_array core function used for calculating a CRC hash for To tags. Exploiting these vulnerabilities may lead to denial of service and potential execution of arbitrary code.

Understanding CVE-2018-16657

Kamailio vulnerability impacting versions prior to 5.0.7 and 5.1.x before 5.1.4.

What is CVE-2018-16657?

CVE-2018-16657 is a vulnerability in Kamailio that allows for a crash when processing a manipulated SIP message with an invalid Via header due to lack of input validation.

The Impact of CVE-2018-16657

The vulnerability can result in denial of service and potentially enable attackers to execute arbitrary code on affected systems.

Technical Details of CVE-2018-16657

Kamailio vulnerability technical specifics.

Vulnerability Description

Crafted SIP message with an invalid Via header causes a segmentation fault and crashes Kamailio.
Missing input validation in core functions leads to the vulnerability.

Affected Systems and Versions

Kamailio versions prior to 5.0.7 and 5.1.x before 5.1.4.

Exploitation Mechanism

Lack of input validation in crcitt_string_array and check_via_address core functions.

Mitigation and Prevention

Steps to address and prevent CVE-2018-16657.

Immediate Steps to Take

Update Kamailio to version 5.0.7 or 5.1.4 to mitigate the vulnerability.
Monitor network traffic for any signs of exploitation.

Long-Term Security Practices

Implement strict input validation mechanisms in SIP message processing.
Regularly update and patch Kamailio to address security vulnerabilities.
Stay informed about security advisories and updates from Kamailio.

Patching and Updates

Apply security patches promptly to ensure the system is protected from known vulnerabilities.