CVE-2021-45957 : Vulnerability Insights and Analysis
Learn about the disputed vulnerability CVE-2021-45957 in Dnsmasq 2.86 with a heap-based buffer overflow. Understand the impact, affected systems, exploitation, and mitigation steps.
Dnsmasq 2.86 has a heap-based buffer overflow in answer_request (called from FuzzAnswerTheRequest and fuzz_rfc1035.c). This CVE has been disputed by the vendor.
Understanding CVE-2021-45957
What is CVE-2021-45957?
CVE-2021-45957 is a disputed vulnerability in Dnsmasq 2.86 due to a heap-based buffer overflow in the answer_request function.
The Impact of CVE-2021-45957
The impact of this CVE is contentious as the vendor claims that CVE-2021-45951 through CVE-2021-45957 do not represent real vulnerabilities according to their knowledge.
Technical Details of CVE-2021-45957
Vulnerability Description
The vulnerability involves a heap-based buffer overflow within the answer_request function of Dnsmasq version 2.86.
Affected Systems and Versions
- Product: Not applicable
- Vendor: Not applicable
- Version: Not applicable (all versions affected)
Exploitation Mechanism
The vulnerability can be exploited through the functions FuzzAnswerTheRequest and fuzz_rfc1035.c.
Mitigation and Prevention
Immediate Steps to Take
- Monitor vendor communications for updates
- Implement network-level protections
Long-Term Security Practices
- Regularly update Dnsmasq to the latest version
- Conduct regular security assessments
Patching and Updates
Stay informed about the vendor's official position on the disputed vulnerabilities and apply relevant patches and updates accordingly.