07 April 2010
Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2010.0331 Important: krb5 security and bug fix update 7 April 2010 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: krb5 Publisher: Red Hat Operating System: Red Hat Enterprise Linux Server 5 Red Hat Enterprise Linux WS/Desktop 5 Impact/Access: Denial of Service -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2010-0629 Reference: ESB-2010.0328 Original Bulletin: https://rhn.redhat.com/errata/RHSA-2010-0343.html - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ===================================================================== Red Hat Security Advisory Synopsis: Important: krb5 security and bug fix update Advisory ID: RHSA-2010:0343-01 Product: Red Hat Enterprise Linux Advisory URL: https://rhn.redhat.com/errata/RHSA-2010-0343.html Issue date: 2010-04-06 CVE Names: CVE-2010-0629 ===================================================================== 1. Summary: Updated krb5 packages that fix one security issue and one bug are now available for Red Hat Enterprise Linux 5. The Red Hat Security Response Team has rated this update as having important security impact. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available from the CVE link in the References section. 2. Relevant releases/architectures: RHEL Desktop Workstation (v. 5 client) - i386, x86_64 Red Hat Enterprise Linux (v. 5 server) - i386, ia64, ppc, s390x, x86_64 Red Hat Enterprise Linux Desktop (v. 5 client) - i386, x86_64 3. Description: Kerberos is a network authentication system which allows clients and servers to authenticate to each other using symmetric encryption and a trusted third party, the Key Distribution Center (KDC). A use-after-free flaw was discovered in the MIT Kerberos administration daemon, kadmind. A remote, authenticated attacker could use this flaw to crash the kadmind daemon. Administrative privileges are not required to trigger this flaw, as any realm user can request information about their own principal from kadmind. (CVE-2010-0629) This update also fixes the following bug: * when a Kerberos client seeks tickets for use with a service, it must contact the Key Distribution Center (KDC) to obtain them. The client must also determine which realm the service belongs to and it typically does this with a combination of client configuration detail, DNS information and guesswork. If the service belongs to a realm other than the client's, cross-realm authentication is required. Using a combination of client configuration and guesswork, the client determines the trust relationship sequence which forms the trusted path between the client's realm and the service's realm. This may include one or more intermediate realms. Anticipating the KDC has better knowledge of extant trust relationships, the client then requests a ticket from the service's KDC, indicating it will accept guidance from the service's KDC by setting a special flag in the request. A KDC which recognizes the flag can, at its option, return a ticket-granting ticket for the next realm along the trust path the client should be following. If the ticket-granting ticket returned by the service's KDC is for use with a realm the client has already determined was in the trusted path, the client accepts this as an optimization and continues. If, however, the ticket is for use in a realm the client is not expecting, the client responds incorrectly: it treats the case as an error rather than continuing along the path suggested by the service's KDC. For this update, the krb5 1.7 modifications which allow the client to trust such KDCs to send them along the correct path, resulting in the client obtaining the tickets it originally desired, were backported to krb 1.6.1 (the version shipped with Red Hat Enterprise Linux 5.5). (BZ#578540) All krb5 users should upgrade to these updated packages, which contain backported patches to correct these issues. All running KDC services must be restarted for the update to take effect. 4. Solution: Before applying this update, make sure all previously-released errata relevant to your system have been applied. This update is available via the Red Hat Network. Details on how to use the Red Hat Network to apply this update are available at http://kbase.redhat.com/faq/docs/DOC-11259 5. Bugs fixed (http://bugzilla.redhat.com/): 576011 - CVE-2010-0629 krb5: kadmind use-after-free remote crash (MITKRB5-SA-2010-003) 578540 - [RFE] Backport referral-chasing code within krb5-1.7 to RHEL5 6. Package List: Red Hat Enterprise Linux Desktop (v. 5 client): Source: ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/krb5-1.6.1-36.el5_5.2.src.rpm i386: krb5-debuginfo-1.6.1-36.el5_5.2.i386.rpm krb5-libs-1.6.1-36.el5_5.2.i386.rpm krb5-workstation-1.6.1-36.el5_5.2.i386.rpm x86_64: krb5-debuginfo-1.6.1-36.el5_5.2.i386.rpm krb5-debuginfo-1.6.1-36.el5_5.2.x86_64.rpm krb5-libs-1.6.1-36.el5_5.2.i386.rpm krb5-libs-1.6.1-36.el5_5.2.x86_64.rpm krb5-workstation-1.6.1-36.el5_5.2.x86_64.rpm RHEL Desktop Workstation (v. 5 client): Source: ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/krb5-1.6.1-36.el5_5.2.src.rpm i386: krb5-debuginfo-1.6.1-36.el5_5.2.i386.rpm krb5-devel-1.6.1-36.el5_5.2.i386.rpm krb5-server-1.6.1-36.el5_5.2.i386.rpm x86_64: krb5-debuginfo-1.6.1-36.el5_5.2.i386.rpm krb5-debuginfo-1.6.1-36.el5_5.2.x86_64.rpm krb5-devel-1.6.1-36.el5_5.2.i386.rpm krb5-devel-1.6.1-36.el5_5.2.x86_64.rpm krb5-server-1.6.1-36.el5_5.2.x86_64.rpm Red Hat Enterprise Linux (v. 5 server): Source: ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/krb5-1.6.1-36.el5_5.2.src.rpm i386: krb5-debuginfo-1.6.1-36.el5_5.2.i386.rpm krb5-devel-1.6.1-36.el5_5.2.i386.rpm krb5-libs-1.6.1-36.el5_5.2.i386.rpm krb5-server-1.6.1-36.el5_5.2.i386.rpm krb5-workstation-1.6.1-36.el5_5.2.i386.rpm ia64: krb5-debuginfo-1.6.1-36.el5_5.2.i386.rpm krb5-debuginfo-1.6.1-36.el5_5.2.ia64.rpm krb5-devel-1.6.1-36.el5_5.2.ia64.rpm krb5-libs-1.6.1-36.el5_5.2.i386.rpm krb5-libs-1.6.1-36.el5_5.2.ia64.rpm krb5-server-1.6.1-36.el5_5.2.ia64.rpm krb5-workstation-1.6.1-36.el5_5.2.ia64.rpm ppc: krb5-debuginfo-1.6.1-36.el5_5.2.ppc.rpm krb5-debuginfo-1.6.1-36.el5_5.2.ppc64.rpm krb5-devel-1.6.1-36.el5_5.2.ppc.rpm krb5-devel-1.6.1-36.el5_5.2.ppc64.rpm krb5-libs-1.6.1-36.el5_5.2.ppc.rpm krb5-libs-1.6.1-36.el5_5.2.ppc64.rpm krb5-server-1.6.1-36.el5_5.2.ppc.rpm krb5-workstation-1.6.1-36.el5_5.2.ppc.rpm s390x: krb5-debuginfo-1.6.1-36.el5_5.2.s390.rpm krb5-debuginfo-1.6.1-36.el5_5.2.s390x.rpm krb5-devel-1.6.1-36.el5_5.2.s390.rpm krb5-devel-1.6.1-36.el5_5.2.s390x.rpm krb5-libs-1.6.1-36.el5_5.2.s390.rpm krb5-libs-1.6.1-36.el5_5.2.s390x.rpm krb5-server-1.6.1-36.el5_5.2.s390x.rpm krb5-workstation-1.6.1-36.el5_5.2.s390x.rpm x86_64: krb5-debuginfo-1.6.1-36.el5_5.2.i386.rpm krb5-debuginfo-1.6.1-36.el5_5.2.x86_64.rpm krb5-devel-1.6.1-36.el5_5.2.i386.rpm krb5-devel-1.6.1-36.el5_5.2.x86_64.rpm krb5-libs-1.6.1-36.el5_5.2.i386.rpm krb5-libs-1.6.1-36.el5_5.2.x86_64.rpm krb5-server-1.6.1-36.el5_5.2.x86_64.rpm krb5-workstation-1.6.1-36.el5_5.2.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: https://www.redhat.com/security/data/cve/CVE-2010-0629.html http://www.redhat.com/security/updates/classification/#important 8. Contact: The Red Hat security contact is <firstname.lastname@example.org>. More contact details at https://www.redhat.com/security/team/contact/ Copyright 2010 Red Hat, Inc. - -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.4 (GNU/Linux) iD8DBQFLu7+ZXlSAg2UNWIIRApjsAJ93XHDDW4hJRWKduwl+5ArUKZrlGgCgs7RU 7EdrL9YNleFuddEdlArDMEU= =Navz - -----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. 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