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RHSA-2012:0428: gnutls security update

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RHSA-2012:0428: gnutls security update



The GnuTLS library provides support for cryptographic algorithms and forprotocols such as Transport Layer Security (TLS). GnuTLS includes libtasn1,a library developed for ASN.1 (Abstract Syntax Notation One) structuresmanagement that includes DER (Distinguished Encoding Rules) encoding anddecoding.A flaw was found in the way GnuTLS decrypted malformed TLS records. Thiscould cause a TLS/SSL client or server to crash when processing aspecially-crafted TLS record from a remote TLS/SSL connection peer.(CVE-2012-1573)A flaw was found in the way libtasn1 decoded DER data. An attacker couldcreate a carefully-crafted X.509 certificate that, when parsed by anapplication that uses GnuTLS, could cause the application to crash.(CVE-2012-1569)A boundary error was found in the gnutls_session_get_data() function. Amalicious TLS/SSL server could use this flaw to crash a TLS/SSL client or,possibly, execute arbitrary code as the client, if the client passed afixed-sized buffer to gnutls_session_get_data() before checking the realsize of the session data provided by the server. (CVE-2011-4128)Red Hat would like to thank Matthew Hall of Mu Dynamics for reportingCVE-2012-1573 and CVE-2012-1569.Users of GnuTLS are advised to upgrade to these updated packages, whichcontain backported patches to correct these issues. For the update to takeeffect, all applications linked to the GnuTLS library must be restarted, orthe system rebooted.


  • redhat-upgrade-gnutls
  • redhat-upgrade-gnutls-debuginfo
  • redhat-upgrade-gnutls-devel
  • redhat-upgrade-gnutls-utils

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