- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Gentoo Linux Security Advisory GLSA 200805-20 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - http://security.gentoo.org/ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Severity: High Title: GnuTLS: Execution of arbitrary code Date: May 21, 2008 Bugs: #222823 ID: 200805-20 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Synopsis ======== Multiple vulnerabilities might allow for the execution of arbitrary code in daemons using GnuTLS. Background ========== GnuTLS is an implementation of Secure Sockets Layer (SSL) 3.0 and Transport Layer Security (TLS) 1.0, 1.1 and 1.2. Affected packages ================= ------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 net-libs/gnutls < 2.2.5 >= 2.2.5 Description =========== Ossi Herrala and Jukka Taimisto of Codenomicon reported three vulnerabilities in libgnutls of GnuTLS: * "Client Hello" messages containing an invalid server name can lead to a buffer overflow when evaluating "Security Parameters" (CVE-2008-1948). * Multiple "Client Hello" messages can lead to a NULL pointer dereference (CVE-2008-1949). * A TLS handshake including an encrypted "Client Hello" message and an invalid record length could lead to a buffer overread (CVE-2008-1950). Impact ====== Unauthenticated remote attackers could exploit these vulnerabilities to cause Denial of Service conditions in daemons using GnuTLS. The first vulnerability (CVE-2008-1948) might allow for the execution of arbitrary code with the privileges of the daemon handling incoming TLS connections. Workaround ========== There is no known workaround at this time. Resolution ========== All GnuTLS users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose ">=net-libs/gnutls-2.2.5" References ========== [ 1 ] CVE-2008-1948 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1948 [ 2 ] CVE-2008-1949 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1949 [ 3 ] CVE-2008-1950 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1950 Availability ============ This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200805-20.xml Concerns? ========= Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security@xxxxxxxxxx or alternatively, you may file a bug at http://bugs.gentoo.org. License ======= Copyright 2008 Gentoo Foundation, Inc; referenced text belongs to its owner(s). The contents of this document are licensed under the Creative Commons - Attribution / Share Alike license. http://creativecommons.org/licenses/by-sa/2.5
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