The GnuTLS library provides support for cryptographic algorithms and for protocols such as Transport Layer Security . A flaw was found in the way the TLS/SSL protocols handled session renegotiation. A man-in-the-middle attacker could use this flaw to prefix arbitrary plain text to a client"s session . This could force the server to process an attacker"s request as if authenticated using the victim"s credentials. This update addresses this flaw by implementing the TLS Renegotiation Indication Extension, as defined in RFC 5746. On 64-bit big endian platforms, this flaw could cause the certificate revocation list check to be bypassed; cause various GnuTLS utilities to crash; or, possibly, execute arbitrary code. Users of GnuTLS are advised to upgrade to these updated packages, which contain backported patches to correct these issues. For the update to take effect, all applications linked to the GnuTLS library must be restarted, or the system rebooted.