CVE-2020-10030 : What You Need to Know

PowerDNS Recursor 4.1.0 up to and including 4.3.0 allows an attacker to disclose uninitialized memory content via a stack-based out-of-bounds read.

Understanding CVE-2020-10030

An issue in PowerDNS Recursor versions 4.1.0 to 4.3.0 can lead to memory disclosure and potential denial of service or arbitrary code execution.

What is CVE-2020-10030?

The vulnerability in PowerDNS Recursor allows an attacker to exploit uninitialized memory content through a stack-based out-of-bounds read.

The Impact of CVE-2020-10030

Attackers with sufficient privileges can cause disclosure of uninitialized memory content
Possibility of denial of service or arbitrary code execution

Technical Details of CVE-2020-10030

PowerDNS Recursor vulnerability details

Vulnerability Description

Occurs when gethostname() lacks '\0' termination, affecting systems with insufficient buffer size
Linux and OpenBSD systems are not affected due to buffer size and proper termination

Affected Systems and Versions

PowerDNS Recursor versions 4.1.0 to 4.3.0

Exploitation Mechanism

Attacker needs enough privileges to change the system's hostname
Out-of-bounds read can lead to writing one '\0' byte on the stack

Mitigation and Prevention

Protecting systems from CVE-2020-10030

Immediate Steps to Take

Apply patches provided by PowerDNS
Monitor for any unusual system behavior

Long-Term Security Practices

Regularly update and patch software to prevent vulnerabilities
Implement least privilege access controls

Patching and Updates

Stay informed about security advisories and updates from PowerDNS