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TITLE:
OpenSSL DSA / ECDSA "EVP_VerifyFinal()" Spoofing Vulnerability

SECUNIA ADVISORY ID:
SA33338

VERIFY ADVISORY:
http://secunia.com/advisories/33338/

CRITICAL:
Moderately critical

IMPACT:
Spoofing

WHERE:
>From remote

SOFTWARE:
OpenSSL 0.9.x
http://secunia.com/advisories/product/253/

DESCRIPTION:
A vulnerability has been reported in OpenSSL, which can be exploited
by malicious people to conduct spoofing attacks.

The vulnerability is caused due to certain OpenSSL functions not
correctly verifying the return value of the "EVP_VerifyFinal()"
function when validating the signature of DSA and ECDSA keys. This
can be exploited to bypass the signature check by e.g. sending a
specially crafted signature of a certificate chain to a client.

Successful exploitation requires that the server uses a certificate
containing a DSA or ECDSA key.

The vulnerability is reported in versions prior to 0.9.8j.

SOLUTION:
Update to version 0.9.8j.
http://openssl.org/source/

PROVIDED AND/OR DISCOVERED BY:
The vendor credits the Google Security Team.

ORIGINAL ADVISORY:
http://www.openssl.org/news/secadv_20090107.txt

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