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Ubuntu 4060-1 Advisory: NSS Denial of Service and Info Leak Issues

ubuntu
Calendar Grey July 16, 2019
Dist Ubuntu Esm H88
Multiple vulnerabilities addressed in NSS for Ubuntu; mandatory upgrade necessary to prevent service interruptions and safeguard sensitive information.
Several security issues were fixed in NSS.

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)

Topics%20covered

Topics Covered

security advisory denial of service Ubuntu sensitive information NSS PKCS curve25519

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

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://ubuntu.com/security/notices/USN-4060-1

CVE-2019-11719, CVE-2019-11727, CVE-2019-11729

Severity
critical
Lowest
Low
Medium
High
Critical

July 16, 2019

Topics%20covered

Topics Covered

security advisory denial of service Ubuntu sensitive information NSS PKCS curve25519

Package Information

https://launchpad.net/ubuntu/+source/nss/2:3.42-1ubuntu2.1
https://launchpad.net/ubuntu/+source/nss/2:3.35-2ubuntu2.3
https://launchpad.net/ubuntu/+source/nss/2:3.28.4-0ubuntu0.16.04.6

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