Ubuntu 17.04 NSS: USN-3270-1 Critical: Denial of Service & Code Execution

ubuntu

April 27, 2017

Several security issues were fixed in NSS.

Summary

Several security issues were fixed in NSS.

Software Description:

- nss: Network Security Service library

Details:

Karthik Bhargavan and Gaetan Leurent discovered that the DES and Triple DES

ciphers were vulnerable to birthday attacks. A remote attacker could

possibly use this flaw to obtain clear text data from long encrypted

sessions. This update causes NSS to limit use of the same symmetric key.

(CVE-2016-2183)

It was discovered that NSS incorrectly handled Base64 decoding. A remote

attacker could use this flaw to cause NSS to crash, resulting in a denial

of service, or possibly execute arbitrary code. (CVE-2017-5461)

This update refreshes the NSS package to version 3.28.4 which includes

the latest CA certificate bundle.

Topics Covered

security advisory Ubuntu Critical Denial of Service Remote Code Execution NSS

Update Instructions

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

Ubuntu 17.04:
  libnss3                         2:3.28.4-0ubuntu0.17.04.1

Ubuntu 16.10:
  libnss3                         2:3.28.4-0ubuntu0.16.10.1

Ubuntu 16.04 LTS:
  libnss3                         2:3.28.4-0ubuntu0.16.04.1

Ubuntu 14.04 LTS:
  libnss3                         2:3.28.4-0ubuntu0.14.04.1

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.