Ubuntu 1197-2: Thunderbird vulnerability

    Date 02 Sep 2011
    Posted By LinuxSecurity Advisories
    A certificate authority issued fraudulent certificates.
    Ubuntu Security Notice USN-1197-2
    September 02, 2011
    thunderbird vulnerability
    A security issue affects these releases of Ubuntu and its derivatives:
    - Ubuntu 11.04
    - Ubuntu 10.10
    - Ubuntu 10.04 LTS
    A certificate authority issued fraudulent certificates.
    Software Description:
    - thunderbird: Mozilla Open Source mail and newsgroup client
    USN-1197-1 fixed a vulnerability in Firefox with regard to the DigiNotar
    certificate authority. This update provides the corresponding updates for
    We are aware that the DigiNotar Root CA Certificate is still shown as
    trusted in the Thunderbird certificate manager. This is due to Thunderbird
    using the system version of the Network Security Service libraries (NSS).
    Thunderbird will actively distrust any certificate signed by this DigiNotar
    Root CA certificate. This means that users will still get an untrusted
    certificate warning when accessing a service through Thunderbird that
    presents a certificate signed by this DigiNotar Root CA certificate.
    Original advisory details:
     It was discovered that Dutch Certificate Authority DigiNotar had
     mis-issued multiple fraudulent certificates. These certificates could allow
     an attacker to perform a "man in the middle" (MITM) attack which would make
     the user believe their connection is secure, but is actually being
     For the protection of its users, Mozilla has removed the DigiNotar
     certificate. Sites using certificates issued by DigiNotar will need to seek
     another certificate vendor.
     We are currently aware of a regression that blocks one of two Staat der
     Nederlanden root certificates which are believed to still be secure. This
     regression is being tracked at https://launchpad.net/bugs/838322.
    Update instructions:
    The problem can be corrected by updating your system to the following
    package versions:
    Ubuntu 11.04:
      thunderbird                     3.1.13+build1+nobinonly-0ubuntu0.11.04.1
    Ubuntu 10.10:
      thunderbird                     3.1.13+build1+nobinonly-0ubuntu0.10.10.1
    Ubuntu 10.04 LTS:
      thunderbird                     3.1.13+build1+nobinonly-0ubuntu0.10.04.1
    After a standard system update you need to restart Thunderbird to make
    all the necessary changes.
    Package Information:

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