USN-2672-1: NSS vulnerabilities
Ubuntu Security Notice USN-2672-1
9th July, 2015
nss vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 15.04
- Ubuntu 14.10
- Ubuntu 14.04 LTS
- Ubuntu 12.04 LTS
Summary
Several security issues were fixed in NSS.
Software description
- nss - Network Security Service library
Details
Karthikeyan Bhargavan discovered that NSS incorrectly handled state
transitions for the TLS state machine. If a remote attacker were able to
perform a man-in-the-middle attack, this flaw could be exploited to skip
the ServerKeyExchange message and remove the forward-secrecy property.
(CVE-2015-2721)
Watson Ladd discovered that NSS incorrectly handled Elliptical Curve
Cryptography (ECC) multiplication. A remote attacker could possibly use
this issue to spoof ECDSA signatures. (CVE-2015-2730)
As a security improvement, this update modifies NSS behaviour to reject DH
key sizes below 768 bits, preventing a possible downgrade attack.
This update also refreshes the NSS package to version 3.19.2 which includes
the latest CA certificate bundle.
Update instructions
The problem can be corrected by updating your system to the following package version:
- Ubuntu 15.04:
- libnss3 2:3.19.2-0ubuntu15.04.1
- Ubuntu 14.10:
- libnss3 2:3.19.2-0ubuntu0.14.10.1
- Ubuntu 14.04 LTS:
- libnss3 2:3.19.2-0ubuntu0.14.04.1
- Ubuntu 12.04 LTS:
- libnss3 3.19.2-0ubuntu0.12.04.1
To update your system, please follow these instructions: http://ift.tt/17VXqjU.
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
from Ubuntu Security Notices http://ift.tt/1Mijdng