USN-3029-1: NSS vulnerability

USN-3029-1: NSS vulnerability

Ubuntu Security Notice USN-3029-1

11th July, 2016

nss vulnerability

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

  • Ubuntu 16.04 LTS
  • Ubuntu 15.10
  • Ubuntu 14.04 LTS
  • Ubuntu 12.04 LTS

Summary

NSS could be made to crash or run programs if it processed specially
crafted network traffic.

Software description

  • nss
    – Network Security Service library

Details

Tyson Smith and Jed Davis discovered that NSS incorrectly handled memory. A
remote attacker could use this issue to cause NSS to crash, resulting in a
denial of service, or possibly execute arbitrary code.

This update refreshes the NSS package to version 3.23 which includes
the latest CA certificate bundle. As a security improvement, this update
also modifies NSS behaviour to reject DH key sizes below 1024 bits,
preventing a possible downgrade attack.

Update instructions

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

Ubuntu 16.04 LTS:
libnss3

2:3.23-0ubuntu0.16.04.1
Ubuntu 15.10:
libnss3

2:3.23-0ubuntu0.15.10.1
Ubuntu 14.04 LTS:
libnss3

2:3.23-0ubuntu0.14.04.1
Ubuntu 12.04 LTS:
libnss3

2:3.23-0ubuntu0.12.04.1

To update your system, please follow these instructions:
https://wiki.ubuntu.com/Security/Upgrades.

This update uses a new upstream release, which includes additional bug
fixes. After a standard system update you need to restart any applications
that use NSS, such as Evolution and Chromium, to make all the necessary
changes.

References

CVE-2016-2834

Source: USN-3029-1: NSS vulnerability

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