CVE-2023-30464: CoreDNS DNS cache poisoning via birthday attack

Executive brief

CoreDNS, a widely used DNS server often found in Kubernetes environments, is vulnerable to DNS cache poisoning. An attacker can exploit this to redirect network traffic to malicious servers by injecting fraudulent DNS records into the system's memory. This could lead to users being directed to phishing sites or the interception of sensitive corporate data.

Technical details

CoreDNS through version 1.10.1 is susceptible to DNS cache poisoning via a birthday attack (CWE-290). The vulnerability allows a remote, unauthenticated attacker to inject forged DNS records into the cache by sending a high volume of malicious responses that match the transaction ID and port of a legitimate pending query. Successful exploitation requires the attacker to overcome high complexity due to the probabilistic nature of the birthday attack. A fix has been identified in the project's source code repository, though specific patched release versions should be verified against the latest project updates.

Affected products

• CoreDNS CoreDNS <= 1.10.1

Timeline

• 2024-09-18: advisory: GitHub Advisory published
• 2024-09-18: disclosed: NVD publication date

References

• https://api.github.com/users/cookesan
• https://github.com/cookesan
• https://api.github.com/users/cookesan/gists%7B/gist_id%7D
• https://api.github.com/users/cookesan/repos
• https://avatars.githubusercontent.com/u/6601329?v=4
• https://api.github.com/users/cookesan/events%7B/privacy%7D