CyberRota Analysis
AI-GeneratedUnbound versions 1.6.2 through 1.25.1 are vulnerable when configured with the 'respip' module alongside a 'response-ip' redirect rule or RPZ file, allowing the rewriting of BOGUS A/AAAA answers without proper security checks. This flaw can lead to clients receiving insecure responses that redirect to an operator's configured IP, potentially enabling malicious actors to exploit the system by spoofing DNS responses. Organizations using affected versions of Unbound, particularly those relying on DNSSEC, should prioritize addressing this vulnerability to mitigate risks of DNS spoofing attacks.
Public Exploit Signal
A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.
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Original NVD Description
In NLnet Labs Unbound 1.6.2 up to and including 1.25.1, when Unbound is configured with the 'respip' module in front of the validator together with a 'response-ip' redirect rule or an RPZ file with an RPZ-IP trigger, the rewriting handler does not check the security status of the upstream answer and can instead rewrite a BOGUS A/AAAA answer to point to an operator's configured IP. If the validator finds an expired or otherwise invalid RRSIG on an answer whose A record falls within a 'response-ip'/RPZ configuration, the answer is still rewritten and given a hard coded security level of INSECURE. This results in the client receiving an INSECURE NOERROR reply rewritten by the operator's configured IP. A malicious actor can exploit the possible poisonous effect by spoofing a BOGUS A/AAAA answer that falls inside the operator's configured subnet rewrites. Such DNSSEC protected answers are then insecurely redirected to the operator's configured target.
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