==================================================================== Red Hat Security Advisory Synopsis: Moderate: krb5 security and bug fix update Advisory ID: RHSA-2014:1245-01 Product: Red Hat Enterprise Linux Advisory URL: https://rhn.redhat.com/errata/RHSA-2014-1245.html Issue date: 2014-09-16 CVE Names: CVE-2013-1418 CVE-2013-6800 CVE-2014-4341 CVE-2014-4344 ==================================================================== 1. Summary: Updated krb5 packages that fix multiple security issues and two bugs are now available for Red Hat Enterprise Linux 5. Red Hat Product Security has rated this update as having Moderate security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section. 2. Relevant releases/architectures: Red Hat Enterprise Linux (v. 5 server) - i386, ia64, ppc, s390x, x86_64 Red Hat Enterprise Linux Desktop (v. 5 client) - i386, x86_64 Red Hat Enterprise Linux Desktop Workstation (v. 5 client) - i386, x86_64 3. Description: Kerberos is an authentication system which allows clients and services to authenticate to each other with the help of a trusted third party, a Kerberos Key Distribution Center (KDC). It was found that if a KDC served multiple realms, certain requests could cause the setup_server_realm() function to dereference a NULL pointer. A remote, unauthenticated attacker could use this flaw to crash the KDC using a specially crafted request. (CVE-2013-1418, CVE-2013-6800) A NULL pointer dereference flaw was found in the MIT Kerberos SPNEGO acceptor for continuation tokens. A remote, unauthenticated attacker could use this flaw to crash a GSSAPI-enabled server application. (CVE-2014-4344) A buffer over-read flaw was found in the way MIT Kerberos handled certain requests. A man-in-the-middle attacker with a valid Kerberos ticket who is able to inject packets into a client or server application's GSSAPI session could use this flaw to crash the application. (CVE-2014-4341) This update also fixes the following bugs: * Prior to this update, the libkrb5 library occasionally attempted to free already freed memory when encrypting credentials. As a consequence, the calling process terminated unexpectedly with a segmentation fault. With this update, libkrb5 frees memory correctly, which allows the credentials to be encrypted appropriately and thus prevents the mentioned crash. (BZ#1004632) * Previously, when the krb5 client library was waiting for a response from a server, the timeout variable in certain cases became a negative number. Consequently, the client could enter a loop while checking for responses. With this update, the client logic has been modified and the described error no longer occurs. (BZ#1089732) All krb5 users are advised to upgrade to these updated packages, which contain backported patches to correct these issues. After installing the updated packages, the krb5kdc daemon will be restarted automatically. 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 https://access.redhat.com/articles/11258 5. Bugs fixed (https://bugzilla.redhat.com/): 1026942 - CVE-2013-1418 krb5: multi-realm KDC null dereference leads to crash 1031499 - CVE-2013-6800 krb5: KDC remote DoS (NULL pointer dereference and daemon crash) 1116180 - CVE-2014-4341 krb5: denial of service flaws when handling padding length longer than the plaintext 1121877 - CVE-2014-4344 krb5: NULL pointer dereference flaw in SPNEGO acceptor for continuation tokens 6. Package List: Red Hat Enterprise Linux Desktop (v. 5 client): Source: krb5-1.6.1-78.el5.src.rpm i386: krb5-debuginfo-1.6.1-78.el5.i386.rpm krb5-libs-1.6.1-78.el5.i386.rpm krb5-workstation-1.6.1-78.el5.i386.rpm x86_64: krb5-debuginfo-1.6.1-78.el5.i386.rpm krb5-debuginfo-1.6.1-78.el5.x86_64.rpm krb5-libs-1.6.1-78.el5.i386.rpm krb5-libs-1.6.1-78.el5.x86_64.rpm krb5-workstation-1.6.1-78.el5.x86_64.rpm Red Hat Enterprise Linux Desktop Workstation (v. 5 client): Source: krb5-1.6.1-78.el5.src.rpm i386: krb5-debuginfo-1.6.1-78.el5.i386.rpm krb5-devel-1.6.1-78.el5.i386.rpm krb5-server-1.6.1-78.el5.i386.rpm krb5-server-ldap-1.6.1-78.el5.i386.rpm x86_64: krb5-debuginfo-1.6.1-78.el5.i386.rpm krb5-debuginfo-1.6.1-78.el5.x86_64.rpm krb5-devel-1.6.1-78.el5.i386.rpm krb5-devel-1.6.1-78.el5.x86_64.rpm krb5-server-1.6.1-78.el5.x86_64.rpm krb5-server-ldap-1.6.1-78.el5.x86_64.rpm Red Hat Enterprise Linux (v. 5 server): Source: krb5-1.6.1-78.el5.src.rpm i386: krb5-debuginfo-1.6.1-78.el5.i386.rpm krb5-devel-1.6.1-78.el5.i386.rpm krb5-libs-1.6.1-78.el5.i386.rpm krb5-server-1.6.1-78.el5.i386.rpm krb5-server-ldap-1.6.1-78.el5.i386.rpm krb5-workstation-1.6.1-78.el5.i386.rpm ia64: krb5-debuginfo-1.6.1-78.el5.i386.rpm krb5-debuginfo-1.6.1-78.el5.ia64.rpm krb5-devel-1.6.1-78.el5.ia64.rpm krb5-libs-1.6.1-78.el5.i386.rpm krb5-libs-1.6.1-78.el5.ia64.rpm krb5-server-1.6.1-78.el5.ia64.rpm krb5-server-ldap-1.6.1-78.el5.ia64.rpm krb5-workstation-1.6.1-78.el5.ia64.rpm ppc: krb5-debuginfo-1.6.1-78.el5.ppc.rpm krb5-debuginfo-1.6.1-78.el5.ppc64.rpm krb5-devel-1.6.1-78.el5.ppc.rpm krb5-devel-1.6.1-78.el5.ppc64.rpm krb5-libs-1.6.1-78.el5.ppc.rpm krb5-libs-1.6.1-78.el5.ppc64.rpm krb5-server-1.6.1-78.el5.ppc.rpm krb5-server-ldap-1.6.1-78.el5.ppc.rpm krb5-workstation-1.6.1-78.el5.ppc.rpm s390x: krb5-debuginfo-1.6.1-78.el5.s390.rpm krb5-debuginfo-1.6.1-78.el5.s390x.rpm krb5-devel-1.6.1-78.el5.s390.rpm krb5-devel-1.6.1-78.el5.s390x.rpm krb5-libs-1.6.1-78.el5.s390.rpm krb5-libs-1.6.1-78.el5.s390x.rpm krb5-server-1.6.1-78.el5.s390x.rpm krb5-server-ldap-1.6.1-78.el5.s390x.rpm krb5-workstation-1.6.1-78.el5.s390x.rpm x86_64: krb5-debuginfo-1.6.1-78.el5.i386.rpm krb5-debuginfo-1.6.1-78.el5.x86_64.rpm krb5-devel-1.6.1-78.el5.i386.rpm krb5-devel-1.6.1-78.el5.x86_64.rpm krb5-libs-1.6.1-78.el5.i386.rpm krb5-libs-1.6.1-78.el5.x86_64.rpm krb5-server-1.6.1-78.el5.x86_64.rpm krb5-server-ldap-1.6.1-78.el5.x86_64.rpm krb5-workstation-1.6.1-78.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://access.redhat.com/security/team/key/#package 7. References: https://www.redhat.com/security/data/cve/CVE-2013-1418.html https://www.redhat.com/security/data/cve/CVE-2013-6800.html https://www.redhat.com/security/data/cve/CVE-2014-4341.html https://www.redhat.com/security/data/cve/CVE-2014-4344.html https://access.redhat.com/security/updates/classification/#moderate 8. Contact: The Red Hat security contact is
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