OpenSSL is a toolkit that implements the Secure Sockets Layer (SSL v2/v3)and Transport Layer Security (TLS v1) protocols, as well as afull-strength, general purpose cryptography library.It was found that the OpenSSL library did not properly re-initialize itsinternal state in the SSL_library_init() function after previous calls tothe CRYPTO_cleanup_all_ex_data() function, which would cause a memory leakfor each subsequent SSL connection. This flaw could cause serverapplications that call those functions during reload, such as a combinationof the Apache HTTP Server, mod_ssl, PHP, and cURL, to consume all availablememory, resulting in a denial of service. (CVE-2009-4355)Dan Kaminsky found that browsers could accept certificates with MD2 hashsignatures, even though MD2 is no longer considered a cryptographicallystrong algorithm. This could make it easier for an attacker to create amalicious certificate that would be treated as trusted by a browser.OpenSSL now disables the use of the MD2 algorithm inside signatures bydefault. (CVE-2009-2409)All OpenSSL users should upgrade to these updated packages, which containbackported patches to resolve these issues. For the update to take effect,all services linked to the OpenSSL library must be restarted, or the systemrebooted.