CVE-2019-14513 : Security Advisory and Response

Dnsmasq versions prior to 2.76 have a vulnerability in their bounds checking mechanism that could be exploited by an attacker with control over a DNS server.

Understanding CVE-2019-14513

This CVE identifies a specific vulnerability in Dnsmasq versions before 2.76 that allows for a buffer overflow attack.

What is CVE-2019-14513?

Dnsmasq versions prior to 2.76 are susceptible to a vulnerability in their bounds checking mechanism. An attacker controlling a DNS server can exploit this by sending large DNS packets, causing a read operation to exceed the allocated buffer.

The Impact of CVE-2019-14513

The vulnerability could lead to a buffer overflow, potentially enabling remote code execution or denial of service attacks.

Technical Details of CVE-2019-14513

Dive deeper into the technical aspects of this vulnerability.

Vulnerability Description

The vulnerability in Dnsmasq before version 2.76 allows an attacker-controlled DNS server to send large DNS packets, leading to a buffer overflow during packet processing.

Affected Systems and Versions

Dnsmasq versions prior to 2.76

Exploitation Mechanism

Attacker-controlled DNS server sends excessively large DNS packets
Buffer overflow occurs during packet processing

Mitigation and Prevention

Learn how to mitigate the risks associated with CVE-2019-14513.

Immediate Steps to Take

Update Dnsmasq to version 2.76 or later
Implement network-level protections to filter out malicious DNS packets

Long-Term Security Practices

Regularly update software and firmware to patch known vulnerabilities
Monitor network traffic for unusual DNS packet sizes or patterns

Patching and Updates

Apply security patches promptly to ensure protection against known vulnerabilities