RHSA-2015:0800: Moderate: openssl security update

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 discovered that OpenSSL would accept ephemeral RSA keys when usingnon-export RSA cipher suites. A malicious server could make a TLS/SSLclient using OpenSSL use a weaker key exchange method. (CVE-2015-0204)An integer underflow flaw, leading to a buffer overflow, was found in theway OpenSSL decoded malformed Base64-encoded inputs. An attacker able tomake an application using OpenSSL decode a specially crafted Base64-encodedinput (such as a PEM file) could use this flaw to cause the application tocrash. Note: this flaw is not exploitable via the TLS/SSL protocol becausethe data being transferred is not Base64-encoded. (CVE-2015-0292)A denial of service flaw was found in the way OpenSSL handled SSLv2handshake messages. A remote attacker could use this flaw to cause aTLS/SSL server using OpenSSL to exit on a failed assertion if it had boththe SSLv2 protocol and EXPORT-grade cipher suites enabled. (CVE-2015-0293)Multiple flaws were found in the way OpenSSL parsed X.509 certificates.An attacker could use these flaws to modify an X.509 certificate to producea certificate with a different fingerprint without invalidating itssignature, and possibly bypass fingerprint-based blacklisting inapplications. (CVE-2014-8275)An out-of-bounds write flaw was found in the way OpenSSL reused certainASN.1 structures. A remote attacker could possibly use a specially craftedASN.1 structure that, when parsed by an application, would cause thatapplication to crash. (CVE-2015-0287)A NULL pointer dereference flaw was found in OpenSSL's X.509 certificatehandling implementation. A specially crafted X.509 certificate could causean application using OpenSSL to crash if the application attempted toconvert the certificate to a certificate request. (CVE-2015-0288)A NULL pointer dereference was found in the way OpenSSL handled certainPKCS#7 inputs. An attacker able to make an application using OpenSSLverify, decrypt, or parse a specially crafted PKCS#7 input could cause thatapplication to crash. TLS/SSL clients and servers using OpenSSL were notaffected by this flaw. (CVE-2015-0289)Red Hat would like to thank the OpenSSL project for reporting CVE-2015-0287, CVE-2015-0288, CVE-2015-0289, CVE-2015-0292, and CVE-2015-0293. Upstream acknowledges Emilia Kasper of the OpenSSL development team as the original reporter of CVE-2015-0287, Brian Carpenter as the original reporter of CVE-2015-0288, Michal Zalewski of Google as the original reporter of CVE-2015-0289, Robert Dugal and David Ramos as the original reporters of CVE-2015-0292, and Sean Burford of Google and Emilia Kasper of the OpenSSL development team as the original reporters of CVE-2015-0293.All openssl users are advised to upgrade to these updated packages, whichcontain backported patches to correct these issues. For the update to takeeffect, all services linked to the OpenSSL library must be restarted, orthe system rebooted.