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AUSCERT External Security Bulletin Redistribution
USN-5104-1: Squid vulnerability
6 October 2021
AusCERT Security Bulletin Summary
Operating System: Ubuntu
UNIX variants (UNIX, Linux, OSX)
Impact/Access: Denial of Service -- Remote/Unauthenticated
Access Confidential Data -- Remote/Unauthenticated
CVE Names: CVE-2021-28116
Comment: This advisory references vulnerabilities in products which run on
platforms other than Ubuntu. It is recommended that administrators
running Squid check for an updated version of the software for their
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USN-5104-1: Squid vulnerability
05 October 2021
Squid could be made to crash or expose sensitive information over the
o Ubuntu 21.04
o Ubuntu 20.04 LTS
o Ubuntu 18.04 LTS
o squid - Web proxy cache server
o squid3 - Web proxy cache server
Lyu discovered that Squid incorrectly handled WCCP protocol data. A remote
attacker could use this issue to cause Squid to crash, resulting in a
denial of service, or possibly obtain sensitive information.
The problem can be corrected by updating your system to the following package
o squid - 4.13-1ubuntu4.2
o squid - 4.10-1ubuntu1.5
o squid - 3.5.27-1ubuntu1.12
In general, a standard system update will make all the necessary changes.
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