MEDIUM
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.
http://lists.opensuse.org/opensuse-updates/2016-08/msg00003.html
http://rhn.redhat.com/errata/RHSA-2016-1609.html
http://rhn.redhat.com/errata/RHSA-2016-1610.html
http://rhn.redhat.com/errata/RHSA-2016-1611.html
http://rhn.redhat.com/errata/RHSA-2016-1612.html
http://rhn.redhat.com/errata/RHSA-2016-1613.html
http://www.debian.org/security/2016/dsa-3631
http://www.kb.cert.org/vuls/id/797896
http://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.html
http://www.oracle.com/technetwork/security-advisory/cpujul2017-3236622.html
http://www.oracle.com/technetwork/topics/security/linuxbulletinjul2016-3090544.html
http://www.securityfocus.com/bid/91821
http://www.securitytracker.com/id/1036335
https://bugzilla.redhat.com/show_bug.cgi?id=1353794
https://github.com/guzzle/guzzle/releases/tag/6.2.1
https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03770en_us
https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05320149
https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05333297
https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05390722
Source: MITRE
Published: 2016-07-19
Updated: 2019-03-04
Type: CWE-284
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
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