N/A - USN-1197-4

Executive Summary

Summary
Title	NSS vulnerability

Informations
Name	USN-1197-4	First vendor Publication	2011-09-08
Vendor	Ubuntu	Last vendor Modification	2011-09-08
Severity (Vendor)	N/A	Revision	N/A

Security-Database Scoring CVSS v3

Cvss vector : N/A
Overall CVSS Score	NA
Base Score	NA	Environmental Score	NA
impact SubScore	NA	Temporal Score	NA
Exploitabality Sub Score	NA

Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector :
Cvss Base Score	Not Defined	Attack Range	Not Defined
Cvss Impact Score	Not Defined	Attack Complexity	Not Defined
Cvss Expoit Score	Not Defined	Authentication	Not Defined
Calculate full CVSS 2.0 Vectors scores

Detail

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 11.04 - Ubuntu 10.10 - Ubuntu 10.04 LTS

Summary:

A certificate authority mis-issued fraudulent certificates.

Software Description: - nss: Network Security Service libraries

Details:

USN-1197-1 and USN-1197-3 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 the Network Security Service libraries (NSS).

Original advisory details:
USN-1197-1

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.

USN-1197-3

USN-1197-1 partially addressed an issue with Dutch Certificate Authority
DigiNotar mis-issuing fraudulent certificates. This update actively
distrusts the DigiNotar root certificate as well as several intermediary
certificates. Also included in this list of distrusted certificates are the
"PKIOverheid" (PKIGovernment) intermediates under DigiNotar's control that
did not chain to DigiNotar's root and were not previously blocked.

Update instructions:

The problem can be corrected by updating your system to the following package versions:

Ubuntu 11.04:
libnss3 3.12.9+ckbi-1.82-0ubuntu2.1

Ubuntu 10.10:
libnss3-1d 3.12.9+ckbi-1.82-0ubuntu0.10.10.3

Ubuntu 10.04 LTS:
libnss3-1d 3.12.9+ckbi-1.82-0ubuntu0.10.04.3

After a standard system update you need to restart any applications that use NSS, such as Thunderbird or Evolution, to make all the necessary changes.

References:
http://www.ubuntu.com/usn/usn-1197-4
http://www.ubuntu.com/usn/usn-1197-1
http://www.ubuntu.com/usn/usn-1197-3, https://launchpad.net/bugs/837557

Package Information:
https://launchpad.net/ubuntu/+source/nss/3.12.9+ckbi-1.82-0ubuntu2.1
https://launchpad.net/ubuntu/+source/nss/3.12.9+ckbi-1.82-0ubuntu0.10.10.3
https://launchpad.net/ubuntu/+source/nss/3.12.9+ckbi-1.82-0ubuntu0.10.04.3