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AUSCERT External Security Bulletin Redistribution
ESB-2021.3294
USN-5104-1: Squid vulnerability
6 October 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: Squid
Publisher: Ubuntu
Operating System: Ubuntu
UNIX variants (UNIX, Linux, OSX)
Windows
Impact/Access: Denial of Service -- Remote/Unauthenticated
Access Confidential Data -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2021-28116
Original Bulletin:
https://ubuntu.com/security/notices/USN-5104-1
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
operating system.
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USN-5104-1: Squid vulnerability
05 October 2021
Squid could be made to crash or expose sensitive information over the
network.
Releases
o Ubuntu 21.04
o Ubuntu 20.04 LTS
o Ubuntu 18.04 LTS
Packages
o squid - Web proxy cache server
o squid3 - Web proxy cache server
Details
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.
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 21.04
o squid - 4.13-1ubuntu4.2
Ubuntu 20.04
o squid - 4.10-1ubuntu1.5
Ubuntu 18.04
o squid - 3.5.27-1ubuntu1.12
In general, a standard system update will make all the necessary changes.
References
o CVE-2021-28116
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The University of Queensland
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