----------------------------------------------------------------------

Did you know that a change in our assessment rating, exploit code
availability, or if an updated patch is released by the vendor, is
not part of this mailing-list?

Click here to learn more:
http://secunia.com/advisories/business_solutions/

----------------------------------------------------------------------

TITLE:
ISC BIND "EVP_VerifyFinal()" and "DSA_do_verify()" Spoofing
Vulnerability

SECUNIA ADVISORY ID:
SA33404

VERIFY ADVISORY:
http://secunia.com/advisories/33404/

CRITICAL:
Less critical

IMPACT:
Spoofing

WHERE:
>From remote

REVISION:
1.1 originally posted 2009-01-08

SOFTWARE:
ISC BIND 9.5.x
http://secunia.com/advisories/product/19274/
ISC BIND 9.4.x
http://secunia.com/advisories/product/14101/
ISC BIND 9.3.x
http://secunia.com/advisories/product/4298/
ISC BIND 9.2.x
http://secunia.com/advisories/product/75/
ISC BIND 9.6.x
http://secunia.com/advisories/product/20938/

DESCRIPTION:
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

This is related to:
SA33338

SOLUTION:
Update to version 9.3.6-P1, 9.4.3-P1, 9.5.1-P1, or 9.6.0-P1.

As a workaround, the vendor recommends to disable the DSA and
NSEC3DSA algorithms. See vendor's advisory for additional
information.

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

Reported in BIND by Florian Weimer.

CHANGELOG:
2009-01-08: Added oCERT advisory link to the "Original Advisory"
section.

ORIGINAL ADVISORY:
ISC:
https://www.isc.org/node/373

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

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

----------------------------------------------------------------------

About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

Subscribe:
http://secunia.com/advisories/secunia_security_advisories/

Definitions: (Criticality, Where etc.)
http://secunia.com/advisories/about_secunia_advisories/


Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

----------------------------------------------------------------------

Unsubscribe: Secunia Security Advisories
http://secunia.com/sec_adv_unsubscribe/?email=packet%40packetstormsecurity.org

----------------------------------------------------------------------