PHP through 7.0.8 does not attempt to address RFC 3875 section 4.1.18 namespace conflicts and therefore does not protect applications from the presence of untrusted client data in the HTTP_PROXY environment variable, which might allow remote attackers to redirect an application's outbound HTTP traffic to an arbitrary proxy server via a crafted Proxy header in an HTTP request, as demonstrated by (1) an application that makes a getenv('HTTP_PROXY') call or (2) a CGI configuration of PHP, aka an "httpoxy" issue.

References[email protected]/message/7RMYXAVNYL2MOBJTFATE73TOVOEZYC5R/[email protected]/message/GXFEIMZPSVGZQQAYIQ7U7DFVX3IBSDLF/[email protected]/message/KZOIUYZDBWNDDHC6XTOLZYRMRXZWTJCP/


Source: MITRE

Published: 2016-07-19

Updated: 2019-03-04

Type: CWE-284

Risk Information

CVSS v2.0

Base Score: 5.1

Vector: AV:N/AC:H/Au:N/C:P/I:P/A:P

Impact Score: 6.4

Exploitability Score: 4.9

Severity: MEDIUM

CVSS v3.0

Base Score: 8.1

Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Impact Score: 5.9

Exploitability Score: 2.2

Severity: HIGH