Ubuntu 20.04 LTS: USN-4356-1 Moderate: Squid Remote Code Execution

ubuntu

May 13, 2020

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:

Jeriko One discovered that Squid incorrectly handled certain Edge Side

Includes (ESI) responses. A malicious remote server could cause Squid to

crash, possibly poison the cache, or possibly execute arbitrary code.

(CVE-2019-12519, CVE-2019-12521)

It was discovered that Squid incorrectly handled the hostname parameter to

cachemgr.cgi when certain browsers are used. A remote attacker could

possibly use this issue to inject HTML or invalid characters in the

hostname parameter. This issue only affected Ubuntu 16.04 LTS, Ubuntu 18.04

LTS, and Ubuntu 19.10. (CVE-2019-18860)

Clément Berthaux and Florian Guilbert discovered that Squid incorrectly

handled Digest Authentication nonce values. A remote attacker could

use this issue to replay nonce values, or possibly execute arbitrary code.

(CVE-2020-11945)

Topics Covered

security advisory squid cache poisoning ubuntu web proxy malicious remote code execution

Update Instructions

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

Ubuntu 20.04 LTS:
  squid                           4.10-1ubuntu1.1

Ubuntu 19.10:
  squid                           4.8-1ubuntu2.3

Ubuntu 18.04 LTS:
  squid                           3.5.27-1ubuntu1.6

Ubuntu 16.04 LTS:
  squid                           3.5.12-1ubuntu7.11

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