USN-4060-1: NSS vulnerabilities

16 July 2019

nss vulnerabilities

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 19.04
  • Ubuntu 18.04 LTS
  • Ubuntu 16.04 LTS

Summary

Several security issues were fixed in NSS.

Software Description

  • nss - Network Security Service library

Details

Henry Corrigan-Gibbs discovered that NSS incorrectly handled importing certain curve25519 private keys. An attacker could use this issue to cause NSS to crash, resulting in a denial of service, or possibly obtain sensitive information. (CVE-2019-11719)

Hubert Kario discovered that NSS incorrectly handled PKCS#1 v1.5 signatures when using TLSv1.3. An attacker could possibly use this issue to trick NSS into using PKCS#1 v1.5 signatures, contrary to expectations. This issue only applied to Ubuntu 19.04. (CVE-2019-11727)

Jonas Allmann discovered that NSS incorrectly handled certain p256-ECDH public keys. An attacker could possibly use this issue to cause NSS to crash, resulting in a denial of service. (CVE-2019-11729)

Update instructions

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

Ubuntu 19.04
libnss3 - 2:3.42-1ubuntu2.1
Ubuntu 18.04 LTS
libnss3 - 2:3.35-2ubuntu2.3
Ubuntu 16.04 LTS
libnss3 - 2:3.28.4-0ubuntu0.16.04.6

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

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

References