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TITLE:
Lasso OpenSSL "DSA_verify()" Spoofing Vulnerability

SECUNIA ADVISORY ID:
SA33449

VERIFY ADVISORY:
http://secunia.com/advisories/33449/

CRITICAL:
Moderately critical

IMPACT:
Spoofing

WHERE:
>From remote

SOFTWARE:
Lasso 2.x
http://secunia.com/advisories/product/20944/

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

The vulnerability is caused due to the library incorrectly verifying
the return value of the "DSA_verify()" OpenSSL function when
validating signatures and can be exploited to potentially spoof
server responses.

The vulnerability is reported in version 2.2.1. Other versions may
also be affected.

SOLUTION:
Fixed in the SVN repository.
https://labs.libre-entreprise.org/plugins/scmsvn/viewcvs.php?root=lasso&view=rev&rev=4045

PROVIDED AND/OR DISCOVERED BY:
Originally reported in OpenSSL by the Google Security Team.

Reported in Lasso by oCERT.

ORIGINAL ADVISORY:
oCERT:
http://www.ocert.org/advisories/ocert-2008-016.html

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