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TITLE:
NTP OpenSSL "EVP_VerifyFinal()" Spoofing Vulnerability

SECUNIA ADVISORY ID:
SA33406

VERIFY ADVISORY:
http://secunia.com/advisories/33406/

CRITICAL:
Less critical

IMPACT:
Spoofing

WHERE:
>From remote

SOFTWARE:
NTP 4.x
http://secunia.com/advisories/product/2926/

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

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

This is related to:
SA33338

The vulnerability is reported in version 4.2.4p5. Prior versions may
also be affected.

SOLUTION:
Reportedly the vulnerability will be fixed in an upcoming 4.2.4p6
version.

Do not trust signatures presented by NTP servers.

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

Reported in NTP by oCERT.

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

OTHER REFERENCES:
SA33338:
http://secunia.com/advisories/33338/

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