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Ubuntu Security Notice USN-6727-2
April 11, 2024
nss regression
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A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
Summary:
USN-6727-1 introduced a regression in NSS.
Software Description:
- nss: Network Security Service library
Details:
USN-6727-1 fixed vulnerabilities in NSS. The update introduced a regression
when trying to load security modules on Ubuntu 20.04 LTS and Ubuntu 22.04
LTS. This update fixes the problem.
We apologize for the inconvenience.
Original advisory details:
  It was discovered that NSS incorrectly handled padding when checking PKCS#1
  certificates. A remote attacker could possibly use this issue to perform
  Bleichenbacher-like attacks and recover private data. This issue only
  affected Ubuntu 20.04 LTS. (CVE-2023-4421)
   It was discovered that NSS had a timing side-channel when performing RSA
  decryption. A remote attacker could possibly use this issue to recover
  private data. (CVE-2023-5388)
   It was discovered that NSS had a timing side-channel when using certain
  NIST curves. A remote attacker could possibly use this issue to recover
  private data. (CVE-2023-6135)
   The NSS package contained outdated CA certificates. This update refreshes
  the NSS package to version 3.98 which includes the latest CA certificate
  bundle and other security improvements.
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 22.04 LTS:
   libnss3                         2:3.98-0ubuntu0.22.04.2
Ubuntu 20.04 LTS:
   libnss3                         2:3.98-0ubuntu0.20.04.2
In general, a standard system update will make all the necessary changes.
References:
   https://ubuntu.com/security/notices/USN-6727-2
   https://ubuntu.com/security/notices/USN-6727-1
   https://launchpad.net/bugs/2060906
Package Information:
   https://launchpad.net/ubuntu/+source/nss/2:3.98-0ubuntu0.22.04.2
   https://launchpad.net/ubuntu/+source/nss/2:3.98-0ubuntu0.20.04.2