Dnsmasq: Provide Misleading Information -- Remote/Unauthenticated

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2021.1918
                     USN-4976-1: Dnsmasq vulnerability
                                3 June 2021

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

Product:           Dnsmasq
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Provide Misleading Information -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2021-3448  

Reference:         ESB-2021.0954

Original Bulletin: 
   https://ubuntu.com/security/notices/USN-4976-1

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USN-4976-1: Dnsmasq vulnerability
02 June 2021

Dnsmasq could be exposed to cache poisoning.
Releases

  o Ubuntu 21.04
  o Ubuntu 20.10
  o Ubuntu 20.04 LTS
  o Ubuntu 18.04 LTS

Packages

  o dnsmasq - Small caching DNS proxy and DHCP/TFTP server

Details

Petr Mensik discovered that Dnsmasq incorrectly randomized source ports in
certain configurations. A remote attacker could possibly use this issue to
facilitate DNS cache poisoning attacks.

Update instructions

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

Ubuntu 21.04

  o dnsmasq - 2.84-1ubuntu2.1
  o dnsmasq-utils - 2.84-1ubuntu2.1
  o dnsmasq-base - 2.84-1ubuntu2.1

Ubuntu 20.10

  o dnsmasq - 2.82-1ubuntu1.3
  o dnsmasq-utils - 2.82-1ubuntu1.3
  o dnsmasq-base - 2.82-1ubuntu1.3

Ubuntu 20.04

  o dnsmasq - 2.80-1.1ubuntu1.4
  o dnsmasq-utils - 2.80-1.1ubuntu1.4
  o dnsmasq-base - 2.80-1.1ubuntu1.4

Ubuntu 18.04

  o dnsmasq - 2.79-1ubuntu0.4
  o dnsmasq-utils - 2.79-1ubuntu0.4
  o dnsmasq-base - 2.79-1ubuntu0.4

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

References

  o CVE-2021-3448

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