Ubuntu 1520-1: Kerberos vulnerabilities

    Date31 Jul 2012
    CategoryUbuntu
    62
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in Kerberos.
    ==========================================================================
    Ubuntu Security Notice USN-1520-1
    July 31, 2012
    
    krb5 vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 12.04 LTS
    - Ubuntu 11.10
    - Ubuntu 11.04
    - Ubuntu 10.04 LTS
    
    Summary:
    
    Several security issues were fixed in Kerberos.
    
    Software Description:
    - krb5: MIT Kerberos Network Authentication Protocol
    
    Details:
    
    Emmanuel Bouillon discovered that the MIT krb5 Key Distribution Center
    (KDC) daemon could free an uninitialized pointer when handling a
    malformed AS-REQ message. A remote unauthenticated attacker could
    use this to cause a denial of service or possibly execute arbitrary
    code. (CVE-2012-1015)
    
    Emmanuel Bouillon discovered that the MIT krb5 Key Distribution Center
    (KDC) daemon could dereference an uninitialized pointer while handling
    a malformed AS-REQ message. A remote unauthenticated attacker could
    use this to cause a denial of service or possibly execute arbitrary
    code. This issue only affected Ubuntu 12.04 LTS. (CVE-2012-1014)
    
    Simo Sorce discovered that the MIT krb5 Key Distribution Center (KDC)
    daemon could dereference a NULL pointer when handling a malformed
    TGS-REQ message. A remote authenticated attacker could use this to
    cause a denial of service. (CVE-2012-1013)
    
    It was discovered that the kadmin protocol implementation in MIT krb5
    did not properly restrict access to the SET_STRING and GET_STRINGS
    operations. A remote authenticated attacker could use this to expose
    or modify sensitive information. This issue only affected Ubuntu
    12.04 LTS. (CVE-2012-1012)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 12.04 LTS:
      krb5-admin-server               1.10+dfsg~beta1-2ubuntu0.3
      krb5-kdc                        1.10+dfsg~beta1-2ubuntu0.3
      krb5-kdc-ldap                   1.10+dfsg~beta1-2ubuntu0.3
    
    Ubuntu 11.10:
      krb5-admin-server               1.9.1+dfsg-1ubuntu2.3
      krb5-kdc                        1.9.1+dfsg-1ubuntu2.3
      krb5-kdc-ldap                   1.9.1+dfsg-1ubuntu2.3
    
    Ubuntu 11.04:
      krb5-admin-server               1.8.3+dfsg-5ubuntu2.3
      krb5-kdc                        1.8.3+dfsg-5ubuntu2.3
      krb5-kdc-ldap                   1.8.3+dfsg-5ubuntu2.3
    
    Ubuntu 10.04 LTS:
      krb5-admin-server               1.8.1+dfsg-2ubuntu0.11
      krb5-kdc                        1.8.1+dfsg-2ubuntu0.11
      krb5-kdc-ldap                   1.8.1+dfsg-2ubuntu0.11
    
    In general, a standard system update will make all the necessary changes.
    
    References:
      http://www.ubuntu.com/usn/usn-1520-1
      CVE-2012-1012, CVE-2012-1013, CVE-2012-1014, CVE-2012-1015
    
    Package Information:
      https://launchpad.net/ubuntu/+source/krb5/1.10+dfsg~beta1-2ubuntu0.3
      https://launchpad.net/ubuntu/+source/krb5/1.9.1+dfsg-1ubuntu2.3
      https://launchpad.net/ubuntu/+source/krb5/1.8.3+dfsg-5ubuntu2.3
      https://launchpad.net/ubuntu/+source/krb5/1.8.1+dfsg-2ubuntu0.11
    
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