USN-3163-1: NSS vulnerabilities

Releases

• Ubuntu 16.10
• Ubuntu 16.04 ESM
• Ubuntu 14.04 ESM
• Ubuntu 12.04

Packages

• nss - Network Security Service library

Details

It was discovered that NSS incorrectly handled certain invalid
Diffie-Hellman keys. A remote attacker could possibly use this flaw to
cause NSS to crash, resulting in a denial of service. This issue only
applied to Ubuntu 12.04 LTS, Ubuntu 14.04 LTS and Ubuntu 16.04 LTS.
(CVE-2016-5285)

Hubert Kario discovered that NSS incorrectly handled Diffie Hellman client
key exchanges. A remote attacker could possibly use this flaw to perform a
small subgroup confinement attack and recover private keys. This issue only
applied to Ubuntu 12.04 LTS, Ubuntu 14.04 LTS and Ubuntu 16.04 LTS.
(CVE-2016-8635)

Franziskus Kiefer discovered that NSS incorrectly mitigated certain timing
side-channel attacks. A remote attacker could possibly use this flaw to
recover private keys. (CVE-2016-9074)

This update refreshes the NSS package to version 3.26.2 which includes
the latest CA certificate bundle.

Update instructions

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

Ubuntu 16.10

• libnss3 - 2:3.26.2-0ubuntu0.16.10.1

Ubuntu 16.04

• libnss3 - 2:3.26.2-0ubuntu0.16.04.2

Ubuntu 14.04

• libnss3 - 2:3.26.2-0ubuntu0.14.04.3

Ubuntu 12.04

• libnss3 - 2:3.26.2-0ubuntu0.12.04.1

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.

References

• CVE-2016-5285
• CVE-2016-8635
• CVE-2016-9074