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             AUSCERT External Security Bulletin Redistribution

                               ESB-2021.1833
                      USN-4967-2: nginx vulnerability
                                28 May 2021

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

Product:           nginx
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Execute Arbitrary Code/Commands -- Remote/Unauthenticated
                   Denial of Service               -- Remote/Unauthenticated
                   Access Confidential Data        -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2021-23017  

Reference:         ESB-2021.1817

Original Bulletin: 
   https://ubuntu.com/security/notices/USN-4967-2

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USN-4967-2: nginx vulnerability
27 May 2021

nginx could be made to crash or run programs if it received specially
crafted network traffic.
Releases

  o Ubuntu 16.04 ESM
  o Ubuntu 14.04 ESM

Packages

  o nginx - small, powerful, scalable web/proxy server

Details

USN-4967-1 fixed a vulnerability in nginx. This update provides
the corresponding update for Ubuntu 14.04 ESM and 16.04 ESM.

Original advisory details:

Luis Merino, Markus Vervier, and Eric Sesterhenn discovered that nginx
incorrectly handled responses to the DNS resolver. A remote attacker could
use this issue to cause nginx 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

  o nginx-extras - 1.10.3-0ubuntu0.16.04.5+esm1
    Available with UA Infra or UA Desktop
  o nginx-core - 1.10.3-0ubuntu0.16.04.5+esm1
    Available with UA Infra or UA Desktop
  o nginx-common - 1.10.3-0ubuntu0.16.04.5+esm1
    Available with UA Infra or UA Desktop
  o nginx-full - 1.10.3-0ubuntu0.16.04.5+esm1
    Available with UA Infra or UA Desktop
  o nginx - 1.10.3-0ubuntu0.16.04.5+esm1
    Available with UA Infra or UA Desktop
  o nginx-light - 1.10.3-0ubuntu0.16.04.5+esm1
    Available with UA Infra or UA Desktop

Ubuntu 14.04

  o nginx-extras - 1.4.6-1ubuntu3.9+esm2
    Available with UA Infra or UA Desktop
  o nginx-core - 1.4.6-1ubuntu3.9+esm2
    Available with UA Infra or UA Desktop
  o nginx-common - 1.4.6-1ubuntu3.9+esm2
    Available with UA Infra or UA Desktop
  o nginx-full - 1.4.6-1ubuntu3.9+esm2
    Available with UA Infra or UA Desktop
  o nginx - 1.4.6-1ubuntu3.9+esm2
    Available with UA Infra or UA Desktop
  o nginx-light - 1.4.6-1ubuntu3.9+esm2
    Available with UA Infra or UA Desktop

In general, a standard system update will make all the necessary changes.

References

  o CVE-2021-23017

Related notices

  o USN-4967-1 : nginx-core, nginx-extras, nginx-common, nginx-light, nginx,
    nginx-full

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