A Squid security update has been released for Ubuntu Linux 18.04 LTS, 20.04 LTS, and 21.04.
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Ubuntu Security Notice USN-5104-1
October 05, 2021
squid, squid3 vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 21.04
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
Summary:
Squid could be made to crash or expose sensitive information over the
network.
Software Description:
- squid: Web proxy cache server
- 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:
squid 4.13-1ubuntu4.2
Ubuntu 20.04 LTS:
squid 4.10-1ubuntu1.5
Ubuntu 18.04 LTS:
squid 3.5.27-1ubuntu1.12
In general, a standard system update will make all the necessary changes.
References:
https://ubuntu.com/security/notices/USN-5104-1
CVE-2021-28116
Package Information:
https://launchpad.net/ubuntu/+source/squid/4.13-1ubuntu4.2
https://launchpad.net/ubuntu/+source/squid/4.10-1ubuntu1.5
https://launchpad.net/ubuntu/+source/squid3/3.5.27-1ubuntu1.12
