__________________________________________________________ The U.S. Department of Energy Computer Incident Advisory Capability ___ __ __ _ ___ / | /_\ / \___ __|__ / \ \___ __________________________________________________________ INFORMATION BULLETIN nss_ldap Security Update [RHSA-2006:0719-5] November 16, 2006 18:00 GMT Number R-051 ______________________________________________________________________________ PROBLEM: A flaw was found in the way nss_ldap handled a PasswordPolicyResponse control sent by an LDAP server. PLATFORM: Red Hat Desktop (v. 4) Red Hat Enterprise Linux AS (v. 4) Red Hat Enterprise Linux ES (v. 4) Red Hat Enterprise Linux WS (v. 4) DAMAGE: If an LDAP server responded to an authentication request with a PasswordPolicyResponse control, it was possible for an application using nss_ldap to improperly authenticate certain users. SOLUTION: Apply current patches. ______________________________________________________________________________ VULNERABILITY The risk is LOW. It is possible for an application using ASSESSMENT: nss_ldap to improperly authenticate certain users. ______________________________________________________________________________ LINKS: CIAC BULLETIN: http://www.ciac.org/ciac/bulletins/r-051.shtml ORIGINAL BULLETIN: https://rhn.redhat.com/errata/RHSA-2006-0719.html CVE: http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-5170 ______________________________________________________________________________ [***** Start RHSA-2006:0719-5 *****] Moderate: nss_ldap security update Advisory: RHSA-2006:0719-5 Type: Security Advisory Severity: Moderate Issued on: 2006-11-15 Last updated on: 2006-11-15 Affected Products: Red Hat Desktop (v. 4) Red Hat Enterprise Linux AS (v. 4) Red Hat Enterprise Linux ES (v. 4) Red Hat Enterprise Linux WS (v. 4) OVAL: com.redhat.rhsa-20060719.xml CVEs (cve.mitre.org): CVE-2006-5170 Details Updated nss_ldap packages that fix a security flaw are now available for Red Hat Enterprise Linux 4. This update has been rated as having moderate security impact by the Red Hat Security Response Team. nss_ldap is a set of C library extensions that allow X.500 and LDAP directory servers to be used as primary sources for aliases, ethers, groups, hosts, networks, protocols, users, RPCs, services, and shadow passwords. A flaw was found in the way nss_ldap handled a PasswordPolicyResponse control sent by an LDAP server. If an LDAP server responded to an authentication request with a PasswordPolicyResponse control, it was possible for an application using nss_ldap to improperly authenticate certain users. (CVE-2006-5170) This flaw was only exploitable within applications which did not properly process nss_ldap error messages. Only xscreensaver is currently known to exhibit this behavior. All users of nss_ldap should upgrade to these updated packages, which contain a backported patch that resolves this issue. Solution Before applying this update, make sure all previously released errata relevant to your system have been applied. This update is available via Red Hat Network. To use Red Hat Network, launch the Red Hat Update Agent with the following command: up2date This will start an interactive process that will result in the appropriate RPMs being upgraded on your system. Updated packages Red Hat Desktop (v. 4) SRPMS: nss_ldap-226-17.src.rpm 8fdad6a352014e9c95f6640896bf91dd IA-32: nss_ldap-226-17.i386.rpm f2728f30aeb7e78623aae9265fae7369 x86_64: nss_ldap-226-17.i386.rpm f2728f30aeb7e78623aae9265fae7369 nss_ldap-226-17.x86_64.rpm 804dba9f8720306da14615b1f353e31d Red Hat Enterprise Linux AS (v. 4) SRPMS: nss_ldap-226-17.src.rpm 8fdad6a352014e9c95f6640896bf91dd IA-32: nss_ldap-226-17.i386.rpm f2728f30aeb7e78623aae9265fae7369 IA-64: nss_ldap-226-17.i386.rpm f2728f30aeb7e78623aae9265fae7369 nss_ldap-226-17.ia64.rpm a8cc0cd2d3bd8f2fa916b8f50506dbfa PPC: nss_ldap-226-17.ppc.rpm 8fe0c5612ddac345de98d98daf3b1f47 nss_ldap-226-17.ppc64.rpm fef89f4ddf2879df5d8b3cad563610dc s390: nss_ldap-226-17.s390.rpm 07f25516c0a7c24c8119f440f4c1fdf0 s390x: nss_ldap-226-17.s390.rpm 07f25516c0a7c24c8119f440f4c1fdf0 nss_ldap-226-17.s390x.rpm e193a588cce944b5fa2a3feb01737b61 x86_64: nss_ldap-226-17.i386.rpm f2728f30aeb7e78623aae9265fae7369 nss_ldap-226-17.x86_64.rpm 804dba9f8720306da14615b1f353e31d Red Hat Enterprise Linux ES (v. 4) SRPMS: nss_ldap-226-17.src.rpm 8fdad6a352014e9c95f6640896bf91dd IA-32: nss_ldap-226-17.i386.rpm f2728f30aeb7e78623aae9265fae7369 IA-64: nss_ldap-226-17.i386.rpm f2728f30aeb7e78623aae9265fae7369 nss_ldap-226-17.ia64.rpm a8cc0cd2d3bd8f2fa916b8f50506dbfa x86_64: nss_ldap-226-17.i386.rpm f2728f30aeb7e78623aae9265fae7369 nss_ldap-226-17.x86_64.rpm 804dba9f8720306da14615b1f353e31d Red Hat Enterprise Linux WS (v. 4) SRPMS: nss_ldap-226-17.src.rpm 8fdad6a352014e9c95f6640896bf91dd IA-32: nss_ldap-226-17.i386.rpm f2728f30aeb7e78623aae9265fae7369 IA-64: nss_ldap-226-17.i386.rpm f2728f30aeb7e78623aae9265fae7369 nss_ldap-226-17.ia64.rpm a8cc0cd2d3bd8f2fa916b8f50506dbfa x86_64: nss_ldap-226-17.i386.rpm f2728f30aeb7e78623aae9265fae7369 nss_ldap-226-17.x86_64.rpm 804dba9f8720306da14615b1f353e31d (The unlinked packages above are only available from the Red Hat Network) Bugs fixed (see bugzilla for more information) 207286 - CVE-2006-5170 When using LDAP for authentication, xscreensaver allows access if account locked out. References http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-5170 http://www.redhat.com/security/updates/classification/#moderate [***** End RHSA-2006:0719-5 *****] _______________________________________________________________________________ CIAC wishes to acknowledge the contributions of Red Hat for the information contained in this bulletin. _______________________________________________________________________________ CIAC, the Computer Incident Advisory Capability, is the computer security incident response team for the U.S. Department of Energy (DOE) and the emergency backup response team for the National Institutes of Health (NIH). CIAC is located at the Lawrence Livermore National Laboratory in Livermore, California. CIAC is also a founding member of FIRST, the Forum of Incident Response and Security Teams, a global organization established to foster cooperation and coordination among computer security teams worldwide. CIAC services are available to DOE, DOE contractors, and the NIH. CIAC can be contacted at: Voice: +1 925-422-8193 (7x24) FAX: +1 925-423-8002 STU-III: +1 925-423-2604 E-mail: ciac@ciac.org Previous CIAC notices, anti-virus software, and other information are available from the CIAC Computer Security Archive. World Wide Web: http://www.ciac.org/ Anonymous FTP: ftp.ciac.org PLEASE NOTE: Many users outside of the DOE, ESnet, and NIH computing communities receive CIAC bulletins. If you are not part of these communities, please contact your agency's response team to report incidents. Your agency's team will coordinate with CIAC. The Forum of Incident Response and Security Teams (FIRST) is a world-wide organization. A list of FIRST member organizations and their constituencies can be obtained via WWW at http://www.first.org/. This document was prepared as an account of work sponsored by an agency of the United States Government. 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