Daniel Bleichenbacher recently described an attack on PKCS #1 v1.5 signatures. Where an RSA key with exponent 3 is used it may be possible for an attacker to forge a PKCS #1 v1.5 signature that would be incorrectly verified by implementations that do not check for excess data in the RSA exponentiation result of the signature. The Google Security Team discovered that OpenSSL is vulnerable to this attack. This issue affects applications that use OpenSSL to verify X.509 certificates as well as other uses of PKCS #1 v1.5. (CVE-2006-4339) http://www.openssl.org/news/secadv_20060905.txt Also affects RHEL3, RHEL2.1, and the OpenSSL compatibility packages in those releases.
An advisory has been issued which should help the problem described in this bug report. This report is therefore being closed with a resolution of ERRATA. For more information on the solution and/or where to find the updated files, please follow the link below. You may reopen this bug report if the solution does not work for you. http://rhn.redhat.com/errata/RHSA-2006-0661.html