[USN-4060-2] NSS vulnerabilities

[Leonidas S. Barbosa]

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Ubuntu Security Notice USN-4060-2
July 16, 2019

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

- Ubuntu 14.04 ESM
- Ubuntu 12.04 ESM

Summary:

Several security issues were fixed in NSS.

Software Description:
- nss: Network Security Service library

Details:

USN-4060-1 fixed several vulnerabilities in nss. This update provides
the corresponding update for Ubuntu 12.04 ESM and Ubuntu 14.04 ESM.

Original advisory 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)

 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 14.04 ESM:
  libnss3                         2:3.28.4-0ubuntu0.14.04.5+esm1

Ubuntu 12.04 ESM:
  libnss3                         2:3.28.4-0ubuntu0.12.04.4

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

References:
  https://usn.ubuntu.com/4060-2
  https://usn.ubuntu.com/4060-1
  CVE-2019-11719, CVE-2019-11729
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