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.