Vulnerability Note VU#905344
HTTP CONNECT and 407 Proxy Authentication Required messages are not integrity protected
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.
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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 (Learn More)
| Vendor | Status | Date Notified | Date Updated |
|---|---|---|---|
| Apple | Affected | 17 Jun 2016 | 11 Aug 2016 |
| Microsoft Corporation | Affected | 17 Jun 2016 | 11 Aug 2016 |
| Opera | Affected | 17 Jun 2016 | 11 Aug 2016 |
| Oracle Corporation | Affected | 17 Jun 2016 | 11 Aug 2016 |
| Lenovo | Not Affected | 17 Jun 2016 | 01 Aug 2016 |
| Arista Networks, Inc. | Unknown | 17 Jun 2016 | 17 Jun 2016 |
| Belkin, Inc. | Unknown | 28 Jul 2016 | 28 Jul 2016 |
| CentOS | Unknown | 17 Jun 2016 | 17 Jun 2016 |
| Cisco | Unknown | 28 Jul 2016 | 28 Jul 2016 |
| CoreOS | Unknown | 17 Jun 2016 | 17 Jun 2016 |
| Debian GNU/Linux | Unknown | 17 Jun 2016 | 17 Jun 2016 |
| DesktopBSD | Unknown | 17 Jun 2016 | 17 Jun 2016 |
| DragonFly BSD Project | Unknown | 17 Jun 2016 | 17 Jun 2016 |
| EMC Corporation | Unknown | 17 Jun 2016 | 17 Jun 2016 |
| F5 Networks, Inc. | Unknown | 17 Jun 2016 | 17 Jun 2016 |
CVSS Metrics (Learn More)
| 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: Unknown
- Date Public: 15 Aug 2016
- Date First Published: 15 Aug 2016
- Date Last Updated: 15 Aug 2016
- Document Revision: 23
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