- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Gentoo Linux Security Advisory GLSA 200507-13 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - http://security.gentoo.org/ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Severity: Normal Title: pam_ldap and nss_ldap: Plain text authentication leak Date: July 14, 2005 Bugs: #96767 ID: 200507-13 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Synopsis ======== pam_ldap and nss_ldap fail to restart TLS when following a referral, possibly leading to credentials being sent in plain text. Background ========== pam_ldap is a Pluggable Authentication Module which allows authentication against an LDAP directory. nss_ldap is a Name Service Switch module which allows 'passwd', 'group' and 'host' database information to be pulled from LDAP. TLS is Transport Layer Security, a protocol that allows encryption of network communications. Affected packages ================= ------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 sys-auth/nss_ldap < 239-r1 >= 239-r1 *>= 226-r1 2 sys-auth/pam_ldap < 178-r1 >= 178-r1 ------------------------------------------------------------------- 2 affected packages on all of their supported architectures. ------------------------------------------------------------------- Description =========== Rob Holland of the Gentoo Security Audit Team discovered that pam_ldap and nss_ldap fail to use TLS for referred connections if they are referred to a master after connecting to a slave, regardless of the "ssl start_tls" ldap.conf setting. Impact ====== An attacker could sniff passwords or other sensitive information as the communication is not encrypted. Workaround ========== pam_ldap and nss_ldap can be set to force the use of SSL instead of TLS. Resolution ========== All pam_ldap users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose ">=sys-auth/pam_ldap-178-r1" All nss_ldap users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose sys-auth/nss_ldap References ========== [ 1 ] CAN-2005-2069 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-2069 Availability ============ This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200507-13.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@gentoo.org or alternatively, you may file a bug at http://bugs.gentoo.org. License ======= Copyright 2005 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/2.0