Advisories

==========================================================================
Ubuntu Security Notice USN-5168-3
December 01, 2021

nss vulnerability
==========================================================================

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

- Ubuntu 16.04 ESM
- Ubuntu 14.04 ESM

Summary:

NSS could be made to crash or run programs if it verified a specially
crafted signature.

Software Description:
- nss: Network Security Service library

Details:

USN-5168-1 fixed a vulnerability in NSS. This update provides
the corresponding update for Ubuntu 14.04 ESM and Ubuntu 16.04 ESM.

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.

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+esm1

Ubuntu 14.04 ESM:
  libnss3                         2:3.28.4-0ubuntu0.14.04.5+esm9

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-5168-3
  https://ubuntu.com/security/notices/USN-5168-1
  CVE-2021-43527

Ubuntu 5168-3: NSS vulnerability

December 1, 2021

Summary

A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 16.04 ESM - Ubuntu 14.04 ESM Summary: NSS could be made to crash or run programs if it verified a specially crafted signature. Software Description: - nss: Network Security Service library Details: USN-5168-1 fixed a vulnerability in NSS. This update provides the corresponding update for Ubuntu 14.04 ESM and Ubuntu 16.04 ESM. 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.

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+esm1 Ubuntu 14.04 ESM: libnss3 2:3.28.4-0ubuntu0.14.04.5+esm9 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-5168-3

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

CVE-2021-43527

Severity
Ubuntu Security Notice USN-5168-3

Package Information

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