A vulnerability has been reported in ISC BIND, which potentially can be exploited by malicious people to conduct spoofing attacks.
The vulnerability is caused due to certain ISC BIND functions not correctly verifying the return value of the OpenSSL "EVP_VerifyFinal()" and "DSA_do_verify()" functions when validating the signature of DSA and NSEC3DSA keys. This may be exploited to e.g. send spoofed responses from zones using DSA or NSEC3DSA keys.
Successful exploitation requires that the zone uses the DSA or NSEC3DSA algorithms.
The vulnerability is reported in the following versions:
* BIND 9.0 (all versions)
* BIND 9.1 (all versions)
* BIND 9.2 (all versions)
* BIND 9.3.0, 9.3.1, 9.3.2, 9.3.3, 9.3.4, 9.3.5, 9.3.6
* BIND 9.4.0, 9.4.1, 9.4.2, 9.4.3
* BIND 9.5.0, 9.5.1
* BIND 9.6.0
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Subject: ISC BIND "EVP_VerifyFinal()" and "DSA_do_verify()" Spoofing Vulnerabil
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