Ubuntu 18.10: USN-3850-1 Critical NSS Remote Issues and Fixes

ubuntu

January 9, 2019

Several security issues were fixed in NSS.

Summary

Several security issues were fixed in NSS.

Software Description:

- nss: Network Security Service library

Details:

Keegan Ryan discovered that NSS incorrectly handled ECDSA key generation.

A local attacker could possibly use this issue to perform a cache-timing

attack and recover private ECDSA keys. (CVE-2018-0495)

It was discovered that NSS incorrectly handled certain v2-compatible

ClientHello messages. A remote attacker could possibly use this issue to

perform a replay attack. (CVE-2018-12384)

It was discovered that NSS incorrectly handled certain padding oracles. A

remote attacker could possibly use this issue to perform a variant of the

Bleichenbacher attack. (CVE-2018-12404)

Topics Covered

security advisory critical remote attack Ubuntu NSS cache-timing ECDSA key

Update Instructions

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

Ubuntu 18.10:
  libnss3                         2:3.36.1-1ubuntu1.1

Ubuntu 18.04 LTS:
  libnss3                         2:3.35-2ubuntu2.1

Ubuntu 16.04 LTS:
  libnss3                         2:3.28.4-0ubuntu0.16.04.4

Ubuntu 14.04 LTS:
  libnss3                         2:3.28.4-0ubuntu0.14.04.4

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