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Ubuntu 16.04 ESM: USN-5168-4 Critical: NSS SSL Regression Fix

ubuntu
Calendar Grey December 7, 2021
Dist Ubuntu Esm H88
Ubuntu Security Notice USN-5171-3 addresses a vulnerability in OpenSSL impacting data encryption, further information provided.
USN-5168-3 introduced a regression in NSS.

Summary

USN-5168-3 introduced a regression in NSS.

Software Description:

- nss: Network Security Service library

Details:

USN-5168-3 fixed a vulnerability in NSS. Unfortunately that update introduced

a regression that could break SSL connections. This update fixes the problem.

We apologize for the inconvenience.

Original advisory details:

Tavis Ormandy discovered that NSS incorrectly handled verifying DSA/RSA-PSS

signatures. A remote attacker could use this issue to cause NSS to crash,

resulting in a denial of service, or possibly execute arbitrary code.

Topics%20covered

Topics Covered

security advisory denial of service ubuntu ssl nss

Update Instructions

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

Ubuntu 16.04 ESM:
  libnss3                         2:3.28.4-0ubuntu0.16.04.14+esm2

Ubuntu 14.04 ESM:
  libnss3                         2:3.28.4-0ubuntu0.14.04.5+esm10

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-5168-4

https://ubuntu.com/security/notices/USN-5168-1

CVE-2021-43527

Severity
critical
Lowest
Low
Medium
High
Critical

December 07, 2021

Topics%20covered

Topics Covered

security advisory denial of service ubuntu ssl nss

Package Information

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