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CERT Coordination Center


HTTP CONNECT and 407 Proxy Authentication Required messages are not integrity protected

Vulnerability Note VU#905344

Original Release Date: 2016-08-15 | Last Revised: 2018-04-04

Overview

HTTP CONNECT requests and 407 Proxy Authentication Required messages are not integrity protected and are susceptible to man-in-the-middle attacks. WebKit-based applications are additionally vulnerable to arbitrary HTML markup and JavaScript execution in the context of the originally requested domain.

Description

Web browsers and operating systems making a HTTPS request via a proxy server are vulnerable to man-in-the-middle (MITM) attacks against HTTP CONNECT requests and proxy response messages. HTTP CONNECT requests are made in clear text over HTTP, meaning an attacker in the position to modify proxy traffic may force the use of 407 Proxy Authentication Required responses to phish for credentials.

WebKit-based clients are vulnerable to additional vectors due to the fact that HTML markup and JavaScript are rendered by the client Document Object Model (DOM) in the context of the originally requested HTTPS domain.

For more information, refer to the FalseCONNECT website.

Impact

An attacker in the position to control HTTP CONNECT requests and proxy responses can conduct MITM attacks, which may include credential phishing and, where vulnerable WebKit-based clients are involved, arbitrary HTML and JavaScript injection.

Solution

Apply an update

Check with affected software vendors and apply an update, if available. Those unable or unwilling to apply an update should consider the following workarounds.

Avoid untrusted networks

Avoid using proxy-configured clients while connected to untrusted networks, including public WiFi. Using a proxy-configured client on an untrusted network increases the chance of falling victim to a MITM attack.

Disable proxy configuration settings

If use of proxy auto-configuration (PAC) or web proxy auto-discovery (WPAD) is not required, consider disabling them.

Vendor Information

905344
Expand all

Apple

Notified:  June 17, 2016 Updated:  April 04, 2018

Status

  Affected

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

We are not aware of further vendor information regarding this vulnerability.

Vendor References

https://support.apple.com/en-us/HT206905 https://support.apple.com/en-us/HT207271 https://support.apple.com/en-us/HT206902

Addendum

WebKit and WebKit-based applications and browsers are affected. Apple has assigned CVE-2016-4642, CVE-2016-4643, and CVE-2016-4644, as described in the HT206905 security bulletin. CVE-2016-7579 is described in the HT207271 bulletin.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

Microsoft Corporation

Notified:  June 17, 2016 Updated:  November 08, 2016

Status

  Affected

Vendor Statement

Please see the reference linked below.

Vendor Information

We are not aware of further vendor information regarding this vulnerability.

Vendor References

https://support.microsoft.com/en-us/kb/3179800

Addendum

There are no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

Opera

Notified:  June 17, 2016 Updated:  August 11, 2016

Status

  Affected

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

We are not aware of further vendor information regarding this vulnerability.

Addendum

There are no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

Oracle Corporation

Notified:  June 17, 2016 Updated:  October 21, 2016

Status

  Affected

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

Oracle has notified the CERT/CC that the vulnerabilities are addressed in the October 2017 Critical Patch Update, linked below.

Vendor References

http://www.oracle.com/technetwork/security-advisory/cpuoct2016-2881722.html

Addendum

Java SE is affected. Oracle has assigned CVE-2016-5597.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

Lenovo

Notified:  June 17, 2016 Updated:  August 01, 2016

Statement Date:   July 28, 2016

Status

  Not Affected

Vendor Statement

Lenovo products are not affected by this vulnerability.

Vendor Information

We are not aware of further vendor information regarding this vulnerability.

Addendum

There are no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

Arista Networks, Inc.

Notified:  June 17, 2016 Updated:  June 17, 2016

Status

  Unknown

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Addendum

There are no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

Belkin, Inc.

Notified:  July 28, 2016 Updated:  July 28, 2016

Status

  Unknown

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Addendum

There are no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

CentOS

Notified:  June 17, 2016 Updated:  June 17, 2016

Status

  Unknown

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Addendum

There are no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

Cisco

Notified:  July 28, 2016 Updated:  July 28, 2016

Status

  Unknown

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Addendum

There are no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

CoreOS

Notified:  June 17, 2016 Updated:  June 17, 2016

Status

  Unknown

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Addendum

There are no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

Debian GNU/Linux

Notified:  June 17, 2016 Updated:  June 17, 2016

Status

  Unknown

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Addendum

There are no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

DesktopBSD

Notified:  June 17, 2016 Updated:  June 17, 2016

Status

  Unknown

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Addendum

There are no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

DragonFly BSD Project

Notified:  June 17, 2016 Updated:  June 17, 2016

Status

  Unknown

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Addendum

There are no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

EMC Corporation

Notified:  June 17, 2016 Updated:  June 17, 2016

Status

  Unknown

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Addendum

There are no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

F5 Networks, Inc.

Notified:  June 17, 2016 Updated:  June 17, 2016

Status

  Unknown

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Addendum

There are no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

Fedora Project

Notified:  June 17, 2016 Updated:  June 17, 2016

Status

  Unknown

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Addendum

There are no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

FreeBSD Project

Notified:  June 17, 2016 Updated:  June 17, 2016

Status

  Unknown

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Addendum

There are no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

Gentoo Linux

Notified:  June 17, 2016 Updated:  June 17, 2016

Status

  Unknown

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Addendum

There are no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

Google

Notified:  June 17, 2016 Updated:  June 17, 2016

Status

  Unknown

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Addendum

There are no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

Hardened BSD

Notified:  June 17, 2016 Updated:  June 17, 2016

Status

  Unknown

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Addendum

There are no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

Hewlett Packard Enterprise

Notified:  June 17, 2016 Updated:  June 17, 2016

Status

  Unknown

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Addendum

There are no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

Hitachi

Notified:  June 17, 2016 Updated:  June 17, 2016

Status

  Unknown

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Addendum

There are no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

IBM Corporation

Notified:  June 17, 2016 Updated:  June 17, 2016

Status

  Unknown

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Addendum

There are no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

Juniper Networks

Notified:  June 17, 2016 Updated:  June 17, 2016

Status

  Unknown

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Addendum

There are no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

Mocana

Notified:  July 28, 2016 Updated:  July 28, 2016

Status

  Unknown

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Addendum

There are no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

Mozilla

Notified:  June 17, 2016 Updated:  June 17, 2016

Status

  Unknown

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Addendum

There are no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

NEC Corporation

Notified:  June 17, 2016 Updated:  June 17, 2016

Status

  Unknown

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Addendum

There are no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

NetBSD

Notified:  June 17, 2016 Updated:  June 17, 2016

Status

  Unknown

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Addendum

There are no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

Nokia

Notified:  June 17, 2016 Updated:  June 17, 2016

Status

  Unknown

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Addendum

There are no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

OmniTI

Notified:  June 17, 2016 Updated:  June 17, 2016

Status

  Unknown

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Addendum

There are no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

OpenBSD

Notified:  June 17, 2016 Updated:  June 17, 2016

Status

  Unknown

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Addendum

There are no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

Openwall GNU/*/Linux

Notified:  June 17, 2016 Updated:  June 17, 2016

Status

  Unknown

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Addendum

There are no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

QNX Software Systems Inc.

Notified:  June 17, 2016 Updated:  June 17, 2016

Status

  Unknown

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Addendum

There are no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

Red Hat, Inc.

Notified:  June 17, 2016 Updated:  June 17, 2016

Status

  Unknown

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Addendum

There are no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

SAP

Notified:  July 28, 2016 Updated:  July 28, 2016

Status

  Unknown

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Addendum

There are no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

SUSE Linux

Notified:  June 17, 2016 Updated:  July 19, 2016

Statement Date:   July 18, 2016

Status

  Unknown

Vendor Statement

SUSE may include fixes for this issue in future updates to SLE or openSUSE packages when they become available from projects implementing GUI http user agents.

Vendor Information

We are not aware of further vendor information regarding this vulnerability.

Addendum

There are no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

Slackware Linux Inc.

Notified:  June 17, 2016 Updated:  June 17, 2016

Status

  Unknown

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Addendum

There are no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

Sony Corporation

Notified:  June 17, 2016 Updated:  June 17, 2016

Status

  Unknown

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Addendum

There are no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

Synology

Notified:  July 28, 2016 Updated:  July 28, 2016

Status

  Unknown

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Addendum

There are no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

Turbolinux

Notified:  June 17, 2016 Updated:  June 17, 2016

Status

  Unknown

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Addendum

There are no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

Ubuntu

Notified:  June 17, 2016 Updated:  June 17, 2016

Status

  Unknown

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Addendum

There are no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

Unisys

Notified:  June 17, 2016 Updated:  June 17, 2016

Status

  Unknown

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Addendum

There are no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

m0n0wall

Notified:  June 17, 2016 Updated:  June 17, 2016

Status

  Unknown

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Addendum

There are no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

openSUSE project

Notified:  June 17, 2016 Updated:  June 17, 2016

Status

  Unknown

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Addendum

There are no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us email.


CVSS Metrics

Group Score Vector
Base 4.3 AV:A/AC:M/Au:N/C:P/I:P/A:N
Temporal 3.4 E:POC/RL:OF/RC:C
Environmental 3.4 CDP:ND/TD:H/CR:ND/IR:ND/AR:ND

References

Credit

Thanks to Jerry Decime for reporting these vulnerabilities.

This document was written by Joel Land.

Other Information

CVE IDs: None
Date Public: 2016-08-15
Date First Published: 2016-08-15
Date Last Updated: 2018-04-04 18:12 UTC
Document Revision: 34

Sponsored by the Department of Homeland Security Office of Cybersecurity and Communications.