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Category:   Application (Generic)  >   PHP Vendors:   PHP Group
PHP "Proxy:" Header Processing Flaw Lets Remote Users Redirect the Target Application Requests to an Arbitrary Web Proxy in Certain Cases
SecurityTracker Alert ID:  1036335
SecurityTracker URL:  http://securitytracker.com/id/1036335
CVE Reference:   CVE-2016-5385   (Links to External Site)
Updated:  Jul 22 2016
Original Entry Date:  Jul 18 2016
Impact:   Disclosure of system information, Disclosure of user information, Host/resource access via network, Modification of system information, Modification of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  Exploit Included:  Yes  

Description:   A vulnerability was reported in PHP. A remote user can redirect the target application requests to an arbitrary web proxy in certain cases.

On systems where the target PHP application relies on the HTTP_PROXY environment variable in a trusted manner, a remote user can send (or can conduct a man-in-the-middle attack to insert or modify) a specially crafted HTTP "Proxy:" header to cause the target PHP application to proxy HTTP connections to an arbitrary port on an arbitrary server. This can be exploited to set the HTTP_PROXY variable on the target PHP application server and cause PHP application server internal requests to be proxied, in certain cases.

The php-fpm and mod_php modules are affected.

Other CGI application platforms are affected.

The original advisory is available at:

https://httpoxy.org/

Dominic Scheirlinck and Scott Geary of Vend reported this vulnerability. Other researchers have reported aspects of this vulnerability affecting various applications since at least 2001.

Impact:   A remote user can cause target CGI application requests to be proxied to an arbitrary web proxy in certain cases.
Solution:   The vendor has issued a fix (5.5.38, 5.6.24, 7.0.9).

The vendor's advisories are available at:

http://php.net/ChangeLog-5.php#5.5.38
http://php.net/ChangeLog-5.php#5.6.24
http://php.net/ChangeLog-7.php#7.0.9

Vendor URL:  php.net/ChangeLog-7.php#7.0.9 (Links to External Site)
Cause:   Access control error
Underlying OS:  Linux (Any), UNIX (Any), Windows (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
Aug 2 2016 (Ubuntu Issues Fix) PHP "Proxy:" Header Processing Flaw Lets Remote Users Redirect the Target Application Requests to an Arbitrary Web Proxy in Certain Cases
Ubuntu has issued a fix for Ubuntu Linux 12.04 LTS, 14.04 LTS, and 16.04 LTS.
Aug 12 2016 (Red Hat Issues Fix) PHP "Proxy:" Header Processing Flaw Lets Remote Users Redirect the Target Application Requests to an Arbitrary Web Proxy in Certain Cases
Red Hat has issued a fix for Red Hat Enterprise Linux 6.
Aug 12 2016 (Red Hat Issues Fix) PHP "Proxy:" Header Processing Flaw Lets Remote Users Redirect the Target Application Requests to an Arbitrary Web Proxy in Certain Cases
Red Hat has issued a fix for Red Hat Enterprise Linux 6, 6.6, 6.7, 7, 7.1, and 7.2.
Aug 12 2016 (Red Hat Issues Fix) PHP "Proxy:" Header Processing Flaw Lets Remote Users Redirect the Target Application Requests to an Arbitrary Web Proxy in Certain Cases
Red Hat has issued a fix for Red Hat Enterprise Linux 6, 6.6, 6.7, 7, 7.1, and 7.2.
Aug 12 2016 (CentOS Issues Fix) PHP "Proxy:" Header Processing Flaw Lets Remote Users Redirect the Target Application Requests to an Arbitrary Web Proxy in Certain Cases
CentOS has issued a fix for CentOS 6.
Aug 12 2016 (Red Hat Issues Fix) PHP "Proxy:" Header Processing Flaw Lets Remote Users Redirect the Target Application Requests to an Arbitrary Web Proxy in Certain Cases
Red Hat has issued a fix for Red Hat Enterprise Linux 6, 6.6, 6.7, 7, 7.1, and 7.2.
Aug 12 2016 (Oracle Issues Fix for Oracle Linux) PHP "Proxy:" Header Processing Flaw Lets Remote Users Redirect the Target Application Requests to an Arbitrary Web Proxy in Certain Cases
Oracle has issued a fix for Oracle Linux 6.
Aug 12 2016 (Red Hat Issues Fix) PHP "Proxy:" Header Processing Flaw Lets Remote Users Redirect the Target Application Requests to an Arbitrary Web Proxy in Certain Cases
Red Hat has issued a fix for Red Hat Enterprise Linux 7.
Aug 12 2016 (Oracle Issues Fix for Oracle Linux) PHP "Proxy:" Header Processing Flaw Lets Remote Users Redirect the Target Application Requests to an Arbitrary Web Proxy in Certain Cases
Oracle has issued a fix for Oracle Linux 7.



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