Red Hat: 2014:1245-01: krb5: Moderate Advisory

    Date15 Sep 2014
    1087
    Posted ByJoe Shakespeare
    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 [More...]
    =====================================================================
                       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 .  More contact
    details at https://access.redhat.com/security/team/contact/
    
    Copyright 2014 Red Hat, Inc.
    

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