Ubuntu 1233-1: Kerberos Vulnerabilities

    Date18 Oct 2011
    CategoryUbuntu
    32
    Posted ByLinuxSecurity Advisories
    Several denial of service issues were fixed in the Kerberos KeyDistribution Center (KDC).
    ==========================================================================
    Ubuntu Security Notice USN-1233-1
    October 18, 2011
    
    krb5 vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 11.10
    - Ubuntu 11.04
    - Ubuntu 10.10
    - Ubuntu 10.04 LTS
    
    Summary:
    
    Several denial of service issues were fixed in the Kerberos Key
    Distribution Center (KDC).
    
    Software Description:
    - krb5: MIT Kerberos Network Authentication Protocol
    
    Details:
    
    Nalin Dahyabhai, Andrej Ota and Kyle Moffett discovered a NULL
    pointer dereference in the KDC LDAP backend. An unauthenticated
    remote attacker could use this to cause a denial of service. This
    issue affected Ubuntu 11.10. (CVE-2011-1527)
    
    Mark Deneen discovered that an assert() could be triggered in the
    krb5_ldap_lockout_audit() function in the KDC LDAP backend and
    the krb5_db2_lockout_audit() function in the KDC DB2 backend. An
    unauthenticated remote attacker could use this to cause a denial of
    service. (CVE-2011-1528)
    
    It was discovered that a NULL pointer dereference could occur in the
    lookup_lockout_policy() function in the KDC LDAP and DB2 backends.
    An unauthenticated remote attacker could use this to cause a denial of
    service. (CVE-2011-1529)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 11.10:
      krb5-kdc                        1.9.1+dfsg-1ubuntu1.1
      krb5-kdc-ldap                   1.9.1+dfsg-1ubuntu1.1
    
    Ubuntu 11.04:
      krb5-kdc                        1.8.3+dfsg-5ubuntu2.2
      krb5-kdc-ldap                   1.8.3+dfsg-5ubuntu2.2
    
    Ubuntu 10.10:
      krb5-kdc                        1.8.1+dfsg-5ubuntu0.8
      krb5-kdc-ldap                   1.8.1+dfsg-5ubuntu0.8
    
    Ubuntu 10.04 LTS:
      krb5-kdc                        1.8.1+dfsg-2ubuntu0.10
      krb5-kdc-ldap                   1.8.1+dfsg-2ubuntu0.10
    
    In general, a standard system update will make all the necessary changes.
    
    References:
      http://www.ubuntu.com/usn/usn-1233-1
      CVE-2011-1527, CVE-2011-1528, CVE-2011-1529
    
    Package Information:
      https://launchpad.net/ubuntu/+source/krb5/1.9.1+dfsg-1ubuntu1.1
      https://launchpad.net/ubuntu/+source/krb5/1.8.3+dfsg-5ubuntu2.2
      https://launchpad.net/ubuntu/+source/krb5/1.8.1+dfsg-5ubuntu0.8
      https://launchpad.net/ubuntu/+source/krb5/1.8.1+dfsg-2ubuntu0.10
    
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