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Ubuntu Security Notice USN-4356-1

Ubuntu Security Notice USN-4356-1
Posted May 13, 2020
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4356-1 - Jeriko One discovered that Squid incorrectly handled certain Edge Side Includes responses. A malicious remote server could cause Squid to crash, possibly poison the cache, or possibly execute arbitrary code. 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. Various other issues were also addressed.

tags | advisory, remote, arbitrary, cgi
systems | linux, ubuntu
advisories | CVE-2019-12519, CVE-2019-18860, CVE-2020-11945
SHA-256 | 960fef25aa8c71a4e17e850351da212e243879b78cfe6f657b38729f18431115

Ubuntu Security Notice USN-4356-1

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-4356-1
May 13, 2020

squid, squid3 vulnerabilities
==========================================================================

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

- Ubuntu 20.04 LTS
- Ubuntu 19.10
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

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)

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.

References:
https://usn.ubuntu.com/4356-1
CVE-2019-12519, CVE-2019-12521, CVE-2019-18860, CVE-2020-11945

Package Information:
https://launchpad.net/ubuntu/+source/squid/4.10-1ubuntu1.1
https://launchpad.net/ubuntu/+source/squid/4.8-1ubuntu2.3
https://launchpad.net/ubuntu/+source/squid3/3.5.27-1ubuntu1.6
https://launchpad.net/ubuntu/+source/squid3/3.5.12-1ubuntu7.11
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