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TITLE:
OpenSSL RSA Signature Forgery Vulnerability

SECUNIA ADVISORY ID:
SA21709

VERIFY ADVISORY:
http://secunia.com/advisories/21709/

CRITICAL:
Less critical

IMPACT:
Security Bypass

WHERE:
>From remote

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

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

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

The vulnerability is reported in versions 0.9.7j and 0.9.8b. Prior
versions may also be affected.

SOLUTION:
OpenSSL 0.9.7 branch:
Update to version 0.9.7k or later.

OpenSSL 0.9.8 branch:
Update to version 0.9.8c or later.

PROVIDED AND/OR DISCOVERED BY:
Daniel Bleichenbacher

ORIGINAL ADVISORY:
http://www.openssl.org/news/secadv_20060905.txt

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About:
This Advisory was delivered by Secunia as a free service to help
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vulnerabilities.

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