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Category:   Application (Web Server/CGI)  >   Apache HTTPD Vendors:   Apache Software Foundation
Apache HTTPD CGI Application "Proxy:" Header Processing Flaw Lets Remote Users Redirect the Target CGI Application Requests to an Arbitrary Web Proxy in Certain Cases
SecurityTracker Alert ID:  1036330
SecurityTracker URL:  http://securitytracker.com/id/1036330
CVE Reference:   CVE-2016-5387   (Links to External Site)
Updated:  Dec 21 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  
Version(s): prior to 2.4.25
Description:   A vulnerability reported in CGI applications that run on Apache HTTPD. A remote user can redirect the target CGI application requests to an arbitrary web proxy in certain cases.

On systems where the Apache HTTPD server is configured to proxy HTTP requests and the target CGI 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 CGI 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 CGI application server and cause CGI application server internal requests to be proxied, in certain cases.

The vulnerability resides in the CGI applications that use the HTTP_PROXY variable.

[Editor's note: This is not an Apache HTTPD vulnerability, per se. Rather, it is a vulnerability in CGI modules or applications that may run on Apache HTTPD or other web server platforms.]

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 that can conduct a man-in-the-middle attack can redirect the target CGI application requests to an arbitrary web proxy in certain cases.
Solution:   The vendor has issued a fix (2.4.25).

The vendor's advisories are available at:

http://httpd.apache.org/security/vulnerabilities_24.html
https://www.apache.org/security/asf-httpoxy-response.txt

Vendor URL:  www.apache.org/security/asf-httpoxy-response.txt (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.
Jul 18 2016 (Red Hat Issues Fix) Apache HTTPD CGI Application "Proxy:" Header Processing Flaw Lets Remote Users Redirect the Target CGI 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.
Jul 18 2016 (Ubuntu Issues Fix) Apache HTTPD CGI Application "Proxy:" Header Processing Flaw Lets Remote Users Redirect the Target CGI Application Requests to an Arbitrary Web Proxy in Certain Cases
Ubuntu has issued a fix for Ubuntu Linux 12.04 LTS, 14.04 LTS, 15.10, and 16.04 LTS.
Jul 18 2016 (Red Hat Issues Fix) Apache HTTPD CGI Application "Proxy:" Header Processing Flaw Lets Remote Users Redirect the Target CGI Application Requests to an Arbitrary Web Proxy in Certain Cases
Red Hat has issued a fix for Red Hat Enterprise Linux 5 and 6.
Jul 18 2016 (Red Hat Issues Fix) Apache HTTPD CGI Application "Proxy:" Header Processing Flaw Lets Remote Users Redirect the Target CGI Application Requests to an Arbitrary Web Proxy in Certain Cases
Red Hat has issued a fix for Red Hat Enterprise Linux 7.
Jul 18 2016 (CentOS Issues Fix) Apache HTTPD CGI Application "Proxy:" Header Processing Flaw Lets Remote Users Redirect the Target CGI Application Requests to an Arbitrary Web Proxy in Certain Cases
CentOS has issued a fix for CentOS 5 and 6.
Jul 18 2016 (CentOS Issues Fix) Apache HTTPD CGI Application "Proxy:" Header Processing Flaw Lets Remote Users Redirect the Target CGI Application Requests to an Arbitrary Web Proxy in Certain Cases
CentOS has issued a fix for CentOS 7.
Jul 18 2016 (Oracle Issues Fix for Oracle Linux) Apache HTTPD CGI Application "Proxy:" Header Processing Flaw Lets Remote Users Redirect the Target CGI Application Requests to an Arbitrary Web Proxy in Certain Cases
Oracle has issued a fix for Oracle Linux 7.
Aug 18 2016 (Red Hat Issues Fix for JBoss) Apache HTTPD CGI Application "Proxy:" Header Processing Flaw Lets Remote Users Redirect the Target CGI Application Requests to an Arbitrary Web Proxy in Certain Cases
Red Hat has issued a fix for JBoss for Red Hat Enterprise Linux.
Aug 18 2016 (Red Hat Issues Fix for JBoss) Apache HTTPD CGI Application "Proxy:" Header Processing Flaw Lets Remote Users Redirect the Target CGI Application Requests to an Arbitrary Web Proxy in Certain Cases
Red Hat has issued a fix for JBoss for Red Hat Enterprise Linux.
Aug 19 2016 (Red Hat Issues Fix for JBoss) Apache HTTPD CGI Application "Proxy:" Header Processing Flaw Lets Remote Users Redirect the Target CGI Application Requests to an Arbitrary Web Proxy in Certain Cases
Red Hat has issued a fix for JBoss for Red Hat Enterprise Linux 7.
Aug 19 2016 (Red Hat Issues Fix for JBoss) Apache HTTPD CGI Application "Proxy:" Header Processing Flaw Lets Remote Users Redirect the Target CGI Application Requests to an Arbitrary Web Proxy in Certain Cases
Red Hat has issued a fix for JBoss for Red Hat Enterprise Linux 6.
Sep 13 2016 (Red Hat Issues Fix for Red Hat JBoss Core Services) Apache HTTPD CGI Application "Proxy:" Header Processing Flaw Lets Remote Users Redirect the Target CGI Application Requests to an Arbitrary Web Proxy in Certain Cases
Red Hat has issued a fix for Red Hat JBoss Core Services for Red Hat Enterprise Linux 6 and 7.
Jan 18 2017 (Juniper Issues Fix for Juniper NSM) Apache HTTPD CGI Application "Proxy:" Header Processing Flaw Lets Remote Users Redirect the Target CGI Application Requests to an Arbitrary Web Proxy in Certain Cases
Juniper has issued a fix for Juniper NSM3000, NSM4000, and NSMExpress.



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