CVE-2019-13952 : Vulnerability Insights and Analysis

This CVE-2019-13952 article provides insights into a stack-based buffer overflow vulnerability in gdnsd versions prior to 2.4.3 and 3.x versions before 3.2.1 when processing zone data with malformed IPv6 addresses.

Understanding CVE-2019-13952

The set_ipv6() function in zscan_rfc1035.rl in gdnsd versions before 2.4.3 and 3.x before 3.2.1 is susceptible to a stack-based buffer overflow via long and malformed IPv6 addresses in zone data.

What is CVE-2019-13952?

The zscan_rfc1035.rl file in gdnsd versions prior to 2.4.3 and 3.x versions before 3.2.1 contains a stack-based buffer overflow vulnerability when processing zone data with a long and malformed IPv6 address in the set_ipv6() function.

The Impact of CVE-2019-13952

This vulnerability could allow an attacker to execute arbitrary code or crash the application, potentially leading to a denial of service (DoS) condition.

Technical Details of CVE-2019-13952

The following technical details shed light on the specifics of CVE-2019-13952:

Vulnerability Description

The set_ipv6() function in zscan_rfc1035.rl in gdnsd versions before 2.4.3 and 3.x before 3.2.1 has a stack-based buffer overflow via a long and malformed IPv6 address in zone data.

Affected Systems and Versions

Affected versions: gdnsd versions prior to 2.4.3 and 3.x versions before 3.2.1

Exploitation Mechanism

The vulnerability arises when processing zone data containing long and malformed IPv6 addresses, triggering a stack-based buffer overflow.

Mitigation and Prevention

To address CVE-2019-13952, consider the following mitigation strategies:

Immediate Steps to Take

Update gdnsd to version 2.4.3 or 3.2.1, which contain fixes for the vulnerability.
Implement network segmentation to limit the impact of potential attacks.

Long-Term Security Practices

Regularly monitor and update software to patch known vulnerabilities.
Conduct security assessments and penetration testing to identify and address weaknesses.

Patching and Updates

Apply patches and updates provided by the gdnsd project to ensure the security of the system.