Ubuntu Security Notice USN-4895-1
March 29, 2021

squid, squid3 vulnerabilities

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 20.10
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS


Several security issues were fixed in Squid.

Software Description:
- squid: Web proxy cache server
- squid3: Web proxy cache server


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.

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.

  CVE-2020-15049, CVE-2020-25097

Package Information: