Ubuntu 20.04 LTS USN-4895-1 Critical: Squid Request Smuggling

ubuntu

March 29, 2021

Several security issues were fixed in Squid.

Summary

Several security issues were fixed in Squid.

Software Description:

- squid: Web proxy cache server

- squid3: Web proxy cache server

Details:

Alex Rousskov and Amit Klein discovered that Squid incorrectly handled

certain Content-Length headers. A remote attacker could possibly use this

issue to perform an HTTP request smuggling attack, resulting in cache

poisoning. This issue only affected Ubuntu 20.04 LTS. (CVE-2020-15049)

Jianjun Chen discovered that Squid incorrectly validated certain input. A

remote attacker could use this issue to perform HTTP Request Smuggling and

possibly access services forbidden by the security controls.

(CVE-2020-25097)

Topics Covered

security advisory critical Ubuntu squid cache poisoning request smuggling

Update Instructions

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

Ubuntu 20.10:
  squid                           4.13-1ubuntu2.1

Ubuntu 20.04 LTS:
  squid                           4.10-1ubuntu1.3

Ubuntu 18.04 LTS:
  squid                           3.5.27-1ubuntu1.10

Ubuntu 16.04 LTS:
  squid                           3.5.12-1ubuntu7.16

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