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RHSA-2010:0977: openssl security update

Severity CVSS Published Added Modified
10 (AV:N/AC:L/Au:N/C:C/I:C/A:C) March 05, 2010 December 21, 2010 July 04, 2017


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.A ciphersuite downgrade flaw was found in the OpenSSL SSL/TLS server code.A remote attacker could possibly use this flaw to change the ciphersuiteassociated with a cached session stored on the server, if the serverenabled the SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG option, possiblyforcing the client to use a weaker ciphersuite after resuming the session.(CVE-2010-4180, CVE-2008-7270)Note: With this update, setting the SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUGoption has no effect and this bug workaround can no longer be enabled.It was discovered that OpenSSL did not always check the return value of thebn_wexpand() function. An attacker able to trigger a memory allocationfailure in that function could possibly crash an application using theOpenSSL library and its UBSEC hardware engine support. (CVE-2009-3245)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.

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