Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2008.0546 -- [RedHat] Low: nss_ldap security and bug fix update 26 May 2008 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: nss_ldap Publisher: Red Hat Operating System: Red Hat Linux 5 Impact: Access Privileged Data Access: Remote/Unauthenticated CVE Names: CVE-2007-5794 Ref: ESB-2007.0950 Original Bulletin: https://rhn.redhat.com/errata/RHSA-2008-0389.html - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ===================================================================== Red Hat Security Advisory Synopsis: Low: nss_ldap security and bug fix update Advisory ID: RHSA-2008:0389-02 Product: Red Hat Enterprise Linux Advisory URL: https://rhn.redhat.com/errata/RHSA-2008-0389.html Issue date: 2008-05-20 Updated on: 2008-05-21 Keywords: dns thread port rebuild exop referral CVE Names: CVE-2007-5794 ===================================================================== 1. Summary: An updated nss_ldap package that fixes a security issue and several bugs is now available. This update has been rated as having low security impact by the Red Hat Security Response Team. 2. Relevant releases/architectures: Red Hat Enterprise Linux Desktop (v. 5 client) - i386, x86_64 Red Hat Enterprise Linux (v. 5 server) - i386, ia64, ppc, s390x, x86_64 3. Description: The nss_ldap package contains the nss_ldap and pam_ldap modules. The nss_ldap module is a plug-in which allows applications to retrieve information about users and groups from a directory server. The pam_ldap module allows PAM-aware applications to use a directory server to verify user passwords. A race condition was discovered in nss_ldap which affected certain applications which make LDAP connections, such as Dovecot. This could cause nss_ldap to answer a request for information about one user with information about a different user. (CVE-2007-5794) In addition, these updated packages fix the following bugs: * a build error prevented the nss_ldap module from being able to use DNS to discover the location of a directory server. For example, when the /etc/nsswitch.conf configuration file was configured to use "ldap", but no "host" or "uri" option was configured in the /etc/ldap.conf configuration file, no directory server was contacted, and no results were returned. * the "port" option in the /etc/ldap.conf configuration file on client machines was ignored. For example, if a directory server which you were attempting to use was listening on a non-default port (i.e. not ports 389 or 636), it was only possible to use that directory server by including the port number in the "uri" option. In this updated package, the "port" option works as expected. * pam_ldap failed to change an expired password if it had to follow a referral to do so, which could occur, for example, when using a slave directory server in a replicated environment. An error such as the following occurred after entering a new password: "LDAP password information update failed: Can't contact LDAP server Insufficient 'write' privilege to the 'userPassword' attribute" This has been resolved in this updated package. * when the "pam_password exop_send_old" password-change method was configured in the /etc/ldap.conf configuration file, a logic error in the pam_ldap module caused client machines to attempt to change a user's password twice. First, the pam_ldap module attempted to change the password using the "exop" request, and then again using an LDAP modify request. * on Red Hat Enterprise Linux 5.1, rebuilding nss_ldap-253-5.el5 when the krb5-*-1.6.1-17.el5 packages were installed failed due to an error such as the following: + /builddir/build/SOURCES/dlopen.sh ./nss_ldap-253/nss_ldap.so dlopen() of "././nss_ldap-253/nss_ldap.so" failed: ./././nss_ldap-253/nss_ldap.so: undefined symbol: request_key error: Bad exit status from /var/tmp/rpm-tmp.62652 (%build) The missing libraries have been added, which resolves this issue. When recursively enumerating the set of members in a given group, the module would allocate insufficient space for storing the set of member names if the group itself contained other groups, thus corrupting the heap. This update includes a backported fix for this bug. Users of nss_ldap should upgrade to these updated packages, which contain backported patches to correct this issue and fix these bugs. 4. Solution: Before applying this update, make sure that all previously-released errata relevant to your system have been applied. This update is available via Red Hat Network. Details on how to use the Red Hat Network to apply this update are available at http://kbase.redhat.com/faq/FAQ_58_10188 5. Bugs fixed (http://bugzilla.redhat.com/): 254172 - Automatic DNS discovery of the LDAP server does not work 364501 - pam_ldap tries to change passwords twice 367461 - CVE-2007-5794 nss_ldap randomly replying with wrong user's data 427370 - RHEL 5.1 nss_ldap does not build with RHEL 5.1 krb5 packages 6. Package List: Red Hat Enterprise Linux Desktop (v. 5 client): Source: ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/nss_ldap-253-12.el5.src.rpm i386: nss_ldap-253-12.el5.i386.rpm nss_ldap-debuginfo-253-12.el5.i386.rpm x86_64: nss_ldap-253-12.el5.i386.rpm nss_ldap-253-12.el5.x86_64.rpm nss_ldap-debuginfo-253-12.el5.i386.rpm nss_ldap-debuginfo-253-12.el5.x86_64.rpm Red Hat Enterprise Linux (v. 5 server): Source: ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/nss_ldap-253-12.el5.src.rpm i386: nss_ldap-253-12.el5.i386.rpm nss_ldap-debuginfo-253-12.el5.i386.rpm ia64: nss_ldap-253-12.el5.i386.rpm nss_ldap-253-12.el5.ia64.rpm nss_ldap-debuginfo-253-12.el5.i386.rpm nss_ldap-debuginfo-253-12.el5.ia64.rpm ppc: nss_ldap-253-12.el5.ppc.rpm nss_ldap-253-12.el5.ppc64.rpm nss_ldap-debuginfo-253-12.el5.ppc.rpm nss_ldap-debuginfo-253-12.el5.ppc64.rpm s390x: nss_ldap-253-12.el5.s390.rpm nss_ldap-253-12.el5.s390x.rpm nss_ldap-debuginfo-253-12.el5.s390.rpm nss_ldap-debuginfo-253-12.el5.s390x.rpm x86_64: nss_ldap-253-12.el5.i386.rpm nss_ldap-253-12.el5.x86_64.rpm nss_ldap-debuginfo-253-12.el5.i386.rpm nss_ldap-debuginfo-253-12.el5.x86_64.rpm These packages are GPG signed by Red Hat for security. Our key and details on how to verify the signature are available from https://www.redhat.com/security/team/key/#package 7. References: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-5794 http://www.redhat.com/security/updates/classification/#low 8. Contact: The Red Hat security contact is <secalert@redhat.com>. More contact details at https://www.redhat.com/security/team/contact/ Copyright 2008 Red Hat, Inc. - -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.4 (GNU/Linux) iD8DBQFINDI3XlSAg2UNWIIRApZPAJ9Kf+xkClLPFcxM+DsAGRJ81cIT8ACgh419 X1FNfKJ0Jq3S2cGXVoxUr0g= =86EC - -----END PGP SIGNATURE----- - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AusCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: http://www.auscert.org.au/render.html?cid=1980 If you believe that your computer system has been compromised or attacked in any way, we encourage you to let us know by completing the secure National IT Incident Reporting Form at: http://www.auscert.org.au/render.html?it=3192 =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQCVAwUBSDoakSh9+71yA2DNAQLLqQP9EeMjRAUOcurSz2dMP8gRQXs345XsUO6J 39VacYNjjS9CDzgCaXlKEmSZGsLNg+I7yF8wV07x6ghI9NYVeYPTjYegedsSTTbs fFHtaG5WxisH53wkWnDX5xgekPt/ObixgF1FbqjeSQkTgmQRkgfsnfBHPLpn3L/1 F3d2mAiCdq8= =eiIK -----END PGP SIGNATURE-----