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TITLE:
GnuTLS RSA Signature Forgery Vulnerability

SECUNIA ADVISORY ID:
SA21937

VERIFY ADVISORY:
http://secunia.com/advisories/21937/

CRITICAL:
Less critical

IMPACT:
Security Bypass

WHERE:
>From remote

SOFTWARE:
GnuTLS 1.x
http://secunia.com/product/3748/

DESCRIPTION:
A vulnerability has been reported in GnuTLS, which can be exploited
by malicious people to bypass certain security restrictions.

The vulnerability is caused due to an error in the verification of
certain signatures. If a RSA key with exponent 3 is used, it may be
possible to forge PKCS #1 v1.5 signatures signed with that key.

The vulnerability has been reported in version 1.4.2. Other versions
may also be affected.

Note: The vulnerability is related to SA21709.

SOLUTION:
Update to version 1.4.4.

PROVIDED AND/OR DISCOVERED BY:
Originally reported by Daniel Bleichenbacher.
The vendor credits Yutaka Oiwa, Kazukuni Kobaraan, and Hajime
Watanabe for reporting a variant in GnuTLS.

ORIGINAL ADVISORY:
http://lists.gnupg.org/pipermail/gnutls-dev/2006-September/001205.html

OTHER REFERENCES:
SA21709:
http://secunia.com/advisories/21709/

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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:
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