Linux Security
    Linux Security
    Linux Security

    Ubuntu 4635-1: Kerberos vulnerability

    Date 17 Nov 2020
    1704
    Posted By LinuxSecurity Advisories
    Kerberos could be made to consume unlimited resources if it received specially crafted ASN.1.
    ==========================================================================
    Ubuntu Security Notice USN-4635-1
    November 17, 2020
    
    krb5 vulnerability
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 20.10
    - Ubuntu 20.04 LTS
    - Ubuntu 18.04 LTS
    - Ubuntu 16.04 LTS
    - Ubuntu 14.04 ESM
    
    Summary:
    
    Kerberos could be made to consume unlimited resources if it received specially crafted
    ASN.1.
    
    Software Description:
    - krb5: MIT Kerberos Network Authentication Protocol
    
    Details:
    
    Demi Obenour discovered that Kerberos incorrectly handled certain ASN.1.
    An attacker could possibly use this issue to cause a denial of service.
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 20.10:
      krb5-admin-server               1.17-10ubuntu0.1
      krb5-k5tls                      1.17-10ubuntu0.1
      krb5-kdc                        1.17-10ubuntu0.1
      krb5-kdc-ldap                   1.17-10ubuntu0.1
      krb5-kpropd                     1.17-10ubuntu0.1
      krb5-locales                    1.17-10ubuntu0.1
      krb5-multidev                   1.17-10ubuntu0.1
      krb5-otp                        1.17-10ubuntu0.1
      krb5-pkinit                     1.17-10ubuntu0.1
      krb5-user                       1.17-10ubuntu0.1
      libgssapi-krb5-2                1.17-10ubuntu0.1
      libgssrpc4                      1.17-10ubuntu0.1
      libk5crypto3                    1.17-10ubuntu0.1
      libkadm5clnt-mit11              1.17-10ubuntu0.1
      libkadm5srv-mit11               1.17-10ubuntu0.1
      libkdb5-9                       1.17-10ubuntu0.1
      libkrad0                        1.17-10ubuntu0.1
      libkrb5-3                       1.17-10ubuntu0.1
      libkrb5support0                 1.17-10ubuntu0.1
    
    Ubuntu 20.04 LTS:
      krb5-admin-server               1.17-6ubuntu4.1
      krb5-k5tls                      1.17-6ubuntu4.1
      krb5-kdc                        1.17-6ubuntu4.1
      krb5-kdc-ldap                   1.17-6ubuntu4.1
      krb5-kpropd                     1.17-6ubuntu4.1
      krb5-locales                    1.17-6ubuntu4.1
      krb5-multidev                   1.17-6ubuntu4.1
      krb5-otp                        1.17-6ubuntu4.1
      krb5-pkinit                     1.17-6ubuntu4.1
      krb5-user                       1.17-6ubuntu4.1
      libgssapi-krb5-2                1.17-6ubuntu4.1
      libgssrpc4                      1.17-6ubuntu4.1
      libk5crypto3                    1.17-6ubuntu4.1
      libkadm5clnt-mit11              1.17-6ubuntu4.1
      libkadm5srv-mit11               1.17-6ubuntu4.1
      libkdb5-9                       1.17-6ubuntu4.1
      libkrad0                        1.17-6ubuntu4.1
      libkrb5-3                       1.17-6ubuntu4.1
      libkrb5support0                 1.17-6ubuntu4.1
    
    Ubuntu 18.04 LTS:
      krb5-admin-server               1.16-2ubuntu0.2
      krb5-k5tls                      1.16-2ubuntu0.2
      krb5-kdc                        1.16-2ubuntu0.2
      krb5-kdc-ldap                   1.16-2ubuntu0.2
      krb5-kpropd                     1.16-2ubuntu0.2
      krb5-locales                    1.16-2ubuntu0.2
      krb5-otp                        1.16-2ubuntu0.2
      krb5-pkinit                     1.16-2ubuntu0.2
      krb5-user                       1.16-2ubuntu0.2
      libgssapi-krb5-2                1.16-2ubuntu0.2
      libgssrpc4                      1.16-2ubuntu0.2
      libk5crypto3                    1.16-2ubuntu0.2
      libkadm5clnt-mit11              1.16-2ubuntu0.2
      libkadm5srv-mit11               1.16-2ubuntu0.2
      libkdb5-9                       1.16-2ubuntu0.2
      libkrad0                        1.16-2ubuntu0.2
      libkrb5-3                       1.16-2ubuntu0.2
      libkrb5support0                 1.16-2ubuntu0.2
    
    Ubuntu 16.04 LTS:
      krb5-admin-server               1.13.2+dfsg-5ubuntu2.2
      krb5-k5tls                      1.13.2+dfsg-5ubuntu2.2
      krb5-kdc                        1.13.2+dfsg-5ubuntu2.2
      krb5-kdc-ldap                   1.13.2+dfsg-5ubuntu2.2
      krb5-locales                    1.13.2+dfsg-5ubuntu2.2
      krb5-multidev                   1.13.2+dfsg-5ubuntu2.2
      krb5-otp                        1.13.2+dfsg-5ubuntu2.2
      krb5-pkinit                     1.13.2+dfsg-5ubuntu2.2
      krb5-user                       1.13.2+dfsg-5ubuntu2.2
      libgssapi-krb5-2                1.13.2+dfsg-5ubuntu2.2
      libgssrpc4                      1.13.2+dfsg-5ubuntu2.2
      libk5crypto3                    1.13.2+dfsg-5ubuntu2.2
      libkadm5clnt-mit9               1.13.2+dfsg-5ubuntu2.2
      libkadm5srv-mit9                1.13.2+dfsg-5ubuntu2.2
      libkdb5-8                       1.13.2+dfsg-5ubuntu2.2
      libkrad0                        1.13.2+dfsg-5ubuntu2.2
      libkrb5-3                       1.13.2+dfsg-5ubuntu2.2
      libkrb5support0                 1.13.2+dfsg-5ubuntu2.2
    
    Ubuntu 14.04 ESM:
      krb5-admin-server               1.12+dfsg-2ubuntu5.4+esm2
      krb5-kdc                        1.12+dfsg-2ubuntu5.4+esm2
      krb5-kdc-ldap                   1.12+dfsg-2ubuntu5.4+esm2
      krb5-locales                    1.12+dfsg-2ubuntu5.4+esm2
      krb5-multidev                   1.12+dfsg-2ubuntu5.4+esm2
      krb5-otp                        1.12+dfsg-2ubuntu5.4+esm2
      krb5-pkinit                     1.12+dfsg-2ubuntu5.4+esm2
      krb5-user                       1.12+dfsg-2ubuntu5.4+esm2
      libgssapi-krb5-2                1.12+dfsg-2ubuntu5.4+esm2
      libgssrpc4                      1.12+dfsg-2ubuntu5.4+esm2
      libk5crypto3                    1.12+dfsg-2ubuntu5.4+esm2
      libkadm5clnt-mit9               1.12+dfsg-2ubuntu5.4+esm2
      libkadm5srv-mit8                1.12+dfsg-2ubuntu5.4+esm2
      libkadm5srv-mit9                1.12+dfsg-2ubuntu5.4+esm2
      libkdb5-7                       1.12+dfsg-2ubuntu5.4+esm2
      libkrad0                        1.12+dfsg-2ubuntu5.4+esm2
      libkrb5-3                       1.12+dfsg-2ubuntu5.4+esm2
      libkrb5support0                 1.12+dfsg-2ubuntu5.4+esm2
    
    In general, a standard system update will make all the necessary changes.
    
    References:
      https://usn.ubuntu.com/4635-1
      CVE-2020-28196
    
    Package Information:
      https://launchpad.net/ubuntu/+source/krb5/1.17-10ubuntu0.1
      https://launchpad.net/ubuntu/+source/krb5/1.17-6ubuntu4.1
      https://launchpad.net/ubuntu/+source/krb5/1.16-2ubuntu0.2
      https://launchpad.net/ubuntu/+source/krb5/1.13.2+dfsg-5ubuntu2.2
    

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