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             AUSCERT External Security Bulletin Redistribution

                               ESB-2021.1944
                     USN-4981-1: Squid vulnerabilities
                                4 June 2021

===========================================================================

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

Product:           Squid
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2021-33620 CVE-2021-31808 CVE-2021-31807
                   CVE-2021-31806 CVE-2021-28662 CVE-2021-28652
                   CVE-2021-28651  

Reference:         ESB-2021.1938
                   ESB-2021.1894
                   ESB-2021.1583

Original Bulletin: 
   https://ubuntu.com/security/notices/USN-4981-1

- --------------------------BEGIN INCLUDED TEXT--------------------

USN-4981-1: Squid vulnerabilities
03 June 2021

Several security issues were fixed in Squid.
Releases

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

Packages

  o squid - Web proxy cache server
  o squid3 - Web proxy cache server

Details

Joshua Rogers discovered that Squid incorrectly handled requests with the
urn: scheme. A remote attacker could possibly use this issue to cause
Squid to consume resources, leading to a denial of service.
( CVE-2021-28651 )

Joshua Rogers discovered that Squid incorrectly handled requests to the
Cache Manager API. A remote attacker with access privileges could possibly
use this issue to cause Squid to consume resources, leading to a denial of
service. This issue was only addressed in Ubuntu 20.04 LTS, Ubuntu 20.10,
and Ubuntu 21.04. ( CVE-2021-28652 )

Joshua Rogers discovered that Squid incorrectly handled certain response
headers. A remote attacker could possibly use this issue to cause Squid to
crash, resulting in a denial of service. This issue was only affected
Ubuntu 20.04 LTS, Ubuntu 20.10, and Ubuntu 21.04. ( CVE-2021-28662 )

Joshua Rogers discovered that Squid incorrectly handled range request
processing. A remote attacker could possibly use this issue to cause Squid
to crash, resulting in a denial of service. ( CVE-2021-31806 ,
CVE-2021-31807 , CVE-2021-31808 )

Joshua Rogers discovered that Squid incorrectly handled certain HTTP
responses. A remote attacker could possibly use this issue to cause Squid
to crash, resulting in a denial of service. ( CVE-2021-33620 )

Update instructions

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

Ubuntu 21.04

  o squid - 4.13-1ubuntu4.1

Ubuntu 20.10

  o squid - 4.13-1ubuntu2.2

Ubuntu 20.04

  o squid - 4.10-1ubuntu1.4

Ubuntu 18.04

  o squid - 3.5.27-1ubuntu1.11

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

References

  o CVE-2021-28651
  o CVE-2021-28652
  o CVE-2021-31806
  o CVE-2021-28662
  o CVE-2021-33620
  o CVE-2021-31808
  o CVE-2021-31807

- --------------------------END INCLUDED TEXT--------------------

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