Patrik Hornik has reported a vulnerability in GnuTLS, which can be exploited by malicious people to cause a DoS (Denial of Service).
The vulnerability is caused due to an error when verifying X.509 certificate signatures. This can be exploited by passing a long certificate chain containing certificates with signatures, which have been signed with overly long RSA keys.
Successful exploitation causes an application linked to the library to consume large amounts of CPU resources.
The vulnerability has been reported in version 1.0.16. Prior versions may also be affected.
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Subject: GnuTLS X.509 Certificate Signature Verification Denial of Service
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