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             AUSCERT External Security Bulletin Redistribution

                               ESB-2020.2075
                      USN-4397-1: NSS vulnerabilities
                               17 June 2020

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           NSS
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Denial of Service        -- Remote with User Interaction
                   Access Confidential Data -- Existing Account            
                   Reduced Security         -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2020-12399 CVE-2019-17023 

Reference:         ESB-2020.2058
                   ESB-2020.2049
                   ESB-2020.0107.2
                   ESB-2020.0054

Original Bulletin: 
   https://usn.ubuntu.com/4397-1/

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USN-4397-1: NSS vulnerabilities
16 June 2020

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

  o Ubuntu 20.04 LTS
  o Ubuntu 19.10
  o Ubuntu 18.04 LTS
  o Ubuntu 16.04 LTS

Summary

Several security issues were fixed in NSS.

Software Description

  o nss - Network Security Service library

Details

It was discovered that NSS incorrectly handled the TLS State Machine. A remote
attacker could possibly use this issue to cause NSS to hang, resulting in a
denial of service. This issue only affected Ubuntu 18.04 LTS and Ubuntu 19.10.
(CVE-2019-17023)

Cesar Pereida Garcia discovered that NSS incorrectly handled DSA key
generation. A local attacker could possibly use this issue to perform a timing
attack and recover DSA keys. (CVE-2020-12399)

Update instructions

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

Ubuntu 20.04 LTS
    libnss3 - 2:3.49.1-1ubuntu1.1
Ubuntu 19.10
    libnss3 - 2:3.45-1ubuntu2.3
Ubuntu 18.04 LTS
    libnss3 - 2:3.35-2ubuntu2.8
Ubuntu 16.04 LTS
    libnss3 - 2:3.28.4-0ubuntu0.16.04.11

To update your system, please follow these instructions: https://
wiki.ubuntu.com/Security/Upgrades .

After a standard system update you need to reboot your computer to make all the
necessary changes.

References

  o CVE-2019-17023
  o CVE-2020-12399

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