Ubuntu Security Notice (C) 2011-2013 Canonical, Inc. / NASL script (C) 2011-2013 Tenable Network Security, Inc.
The remote Ubuntu host is missing a security-related patch.
USN-1197-1 fixed a vulnerability in Firefox with regard to the
DigiNotar certificate authority. This update provides the
corresponding updates for Thunderbird.
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.
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 monitored.
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 the affected thunderbird package.
Risk factor :