ESB-2020.2654 – [Ubuntu] Squid: Multiple vulnerabilities

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2020.2654
                     USN-4446-1: Squid vulnerabilities
                               4 August 2020

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

Product:           Squid
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Denial of Service        -- Remote/Unauthenticated
                   Access Confidential Data -- Remote/Unauthenticated
                   Unauthorised Access      -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-18676 CVE-2019-12524 CVE-2019-12523
                   CVE-2019-12520  

Reference:         ESB-2020.2363
                   ESB-2020.1736.2

Original Bulletin: 
   https://usn.ubuntu.com/4446-1/

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USN-4446-1: Squid vulnerabilities
03 August 2020

Several security issues were fixed in Squid.
Releases

  o Ubuntu 18.04 LTS
  o Ubuntu 16.04 LTS

Packages

  o squid3 - Web proxy cache server

Details

Jeriko One discovered that Squid incorrectly handled caching certain
requests. A remote attacker could possibly use this issue to perform
cache-injection attacks or gain access to reverse proxy features such as
ESI. (CVE-2019-12520)

Jeriko One and Kristoffer Danielsson discovered that Squid incorrectly
handled certain URN requests. A remote attacker could possibly use this
issue to bypass access checks. (CVE-2019-12523)

Jeriko One discovered that Squid incorrectly handled URL decoding. A remote
attacker could possibly use this issue to bypass certain rule checks.
(CVE-2019-12524)

Jeriko One and Kristoffer Danielsson discovered that Squid incorrectly
handled input validation. A remote attacker could use this issue to cause
Squid to crash, resulting in a denial of service. (CVE-2019-18676)

Update instructions

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

Ubuntu 18.04

  o squid - 3.5.27-1ubuntu1.7

Ubuntu 16.04

  o squid - 3.5.12-1ubuntu7.12

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

References

  o CVE-2019-12520
  o CVE-2019-12523
  o CVE-2019-12524
  o CVE-2019-18676

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