CVE-2021-45955 : What You Need to Know

Dnsmasq 2.86 has a heap-based buffer overflow in resize_packet due to the lack of proper bounds check upon pseudo header re-insertion. The vulnerability is disputed, but a security patch might be necessary.

Understanding CVE-2021-45955

What is CVE-2021-45955?

Dnsmasq 2.86 is affected by a heap-based buffer overflow vulnerability, potentially leading to security issues. The vendor's stance on the vulnerability is controversial, with conflicting opinions on its severity.

The Impact of CVE-2021-45955

The disputed nature of this vulnerability raises questions about its severity and the necessity of a security patch. The lack of a bounds check could potentially be exploited by attackers to trigger a heap-based buffer overflow.

Technical Details of CVE-2021-45955

Vulnerability Description

The vulnerability in Dnsmasq 2.86 lies in the resize_packet function, called from FuzzResizePacket and fuzz_rfc1035.c, due to inadequate bounds checking during pseudo header re-insertion.

Affected Systems and Versions

Affected Product: n/a
Affected Vendor: n/a
Affected Version: n/a

Exploitation Mechanism

The lack of a proper bounds check upon pseudo header re-insertion in Dnsmasq 2.86 could allow malicious actors to trigger a heap-based buffer overflow, potentially leading to unauthorized access and system compromise.

Mitigation and Prevention

Immediate Steps to Take

Monitor vendor communications for updates on the disputed nature of the vulnerability.
Consider implementing additional security measures to mitigate potential risks.

Long-Term Security Practices

Regularly update software and patch known vulnerabilities to enhance system security.
Conduct thorough security testing and audits to identify and address potential weaknesses.

Patching and Updates

Stay informed on any developments regarding the disputed vulnerability in Dnsmasq 2.86 and apply security patches as recommended.