=========================================================================Ubuntu Security Notice USN-5506-1
July 07, 2022

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

- Ubuntu 22.04 LTS
- Ubuntu 21.10
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS

Summary:

Several security issues were fixed in NSS.

Software Description:
- nss: Network Security Service library

Details:

Tavis Ormandy discovered that NSS incorrectly handled an empty pkcs7
sequence. A remote attacker could possibly use this issue to cause NSS to
crash, resulting in a denial of service. This issue only affected Ubuntu
18.04 LTS, Ubuntu 20.04 LTS, and Ubuntu 21.10. (CVE-2022-22747)

Ronald Crane discovered that NSS incorrectly handled certain memory
operations. A remote attacker could use this issue to cause NSS to crash,
resulting in a denial of service, or possibly execute arbitrary code.
(CVE-2022-34480)

Update instructions:

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

Ubuntu 22.04 LTS:
  libnss3                         2:3.68.2-0ubuntu1.1

Ubuntu 21.10:
  libnss3                         2:3.68-1ubuntu1.2

Ubuntu 20.04 LTS:
  libnss3                         2:3.49.1-1ubuntu1.8

Ubuntu 18.04 LTS:
  libnss3                         2:3.35-2ubuntu2.15

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

References:
  https://ubuntu.com/security/notices/USN-5506-1
  CVE-2022-22747, CVE-2022-34480

Package Information:
  https://launchpad.net/ubuntu/+source/nss/2:3.68.2-0ubuntu1.1
  https://launchpad.net/ubuntu/+source/nss/2:3.68-1ubuntu1.2
  https://launchpad.net/ubuntu/+source/nss/2:3.49.1-1ubuntu1.8
  https://launchpad.net/ubuntu/+source/nss/2:3.35-2ubuntu2.15