[USN-1197-5] CA Certificates vulnerability

Micah Gersten micah at canonical.com
Fri Sep 9 06:14:37 UTC 2011

Ubuntu Security Notice USN-1197-5
September 09, 2011

ca-certificates 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 mis-issued fraudulent certificates.

Software Description:
- ca-certificates: Common CA certificates


USN-1197-1 addressed an issue in Firefox and Xulrunner pertaining to the
Dutch Certificate Authority DigiNotar mis-issuing fraudulent certificates.
This update provides the corresponding update for ca-certificates.

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:
  ca-certificates                 20090814+nmu2ubuntu0.1

Ubuntu 10.10:
  ca-certificates                 20090814ubuntu0.10.10.1

Ubuntu 10.04 LTS:
  ca-certificates                 20090814ubuntu0.10.04.1

After a standard system update you need to restart any application using
ca-certificates to make all the necessary changes.


Package Information:

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