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             AUSCERT External Security Bulletin Redistribution

                     USN-4356-1: Squid vulnerabilities
                                14 May 2020


        AusCERT Security Bulletin Summary

Product:           Squid
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Execute Arbitrary Code/Commands -- Remote/Unauthenticated
                   Denial of Service               -- Remote/Unauthenticated
                   Reduced Security                -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2020-11945 CVE-2019-18860 CVE-2019-12521

Reference:         ESB-2020.1604

Original Bulletin: 

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USN-4356-1: Squid vulnerabilities
13 May 2020

squid, squid3 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


Several security issues were fixed in Squid.

Software Description

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


Jeriko One discovered that Squid incorrectly handled certain Edge Side Includes
(ESI) responses. A malicious remote server could cause Squid to crash, possibly
poison the cache, or possibly execute arbitrary code. (CVE-2019-12519,

It was discovered that Squid incorrectly handled the hostname parameter to
cachemgr.cgi when certain browsers are used. A remote attacker could possibly
use this issue to inject HTML or invalid characters in the hostname parameter.
This issue only affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 19.10.

ClA(C)ment Berthaux and Florian Guilbert discovered that Squid incorrectly
handled Digest Authentication nonce values. A remote attacker could use this
issue to replay nonce values, or possibly execute arbitrary code.

Update instructions

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

Ubuntu 20.04 LTS
    squid - 4.10-1ubuntu1.1
Ubuntu 19.10
    squid - 4.8-1ubuntu2.3
Ubuntu 18.04 LTS
    squid - 3.5.27-1ubuntu1.6
Ubuntu 16.04 LTS
    squid - 3.5.12-1ubuntu7.11

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

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


  o CVE-2019-12519
  o CVE-2019-12521
  o CVE-2019-18860
  o CVE-2020-11945

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