- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Gentoo Linux Security Advisory GLSA 200609-15 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - http://security.gentoo.org/ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Severity: Normal Title: GnuTLS: RSA Signature Forgery Date: September 26, 2006 Bugs: #147682 ID: 200609-15 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Synopsis ======== GnuTLS fails to handle excess data which could allow an attacker to forge a PKCS #1 v1.5 signature. Background ========== GnuTLS is an implementation of SSL 3.0 and TLS 1.0. Affected packages ================= ------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 net-libs/gnutls < 1.4.4 >= 1.4.4 Description =========== verify.c fails to properly handle excess data in digestAlgorithm.parameters field while generating a hash when using an RSA key with exponent 3. RSA keys that use exponent 3 are commonplace. Impact ====== Remote attackers could forge PKCS #1 v1.5 signatures that are signed with an RSA key, preventing GnuTLS from correctly verifying X.509 and other certificates that use PKCS. Workaround ========== There is no known workaround at this time. Resolution ========== All GnuTLS users should update both packages: # emerge --sync # emerge --update --ask --verbose ">=net-libs/gnutls-1.4.4" References ========== [ 1 ] CVE-2006-4790 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-4790 Availability ============ This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200609-15.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 2006 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
Attachment:
pgpjse7YFvsoP.pgp
Description: PGP signature