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Protect a server from httpoxy by stopping the incoming Proxy header before it becomes the CGI HTTP_PROXY environment variable, then update the web server, runtime and outbound HTTP libraries. Finally, inventory every CGI-like endpoint and verify that application code cannot replace an intentional proxy setting with request data.
httpoxy is relevant only when request data reaches a CGI or CGI-like process and an HTTP client trusts HTTP_PROXY. A normal WSGI or FastCGI deployment is described as avoiding this specific CGI environment pollution, but bridges and wrappers still need to be checked.
What the httpoxy vulnerability does
CGI maps an incoming HTTP header named Proxy to an environment variable named HTTP_PROXY, following the CGI convention of prefixing headers with HTTP_. Many HTTP clients also read HTTP_PROXY as an instruction for where to send outbound requests. The same name therefore carries two unrelated meanings.
An attacker sends a request containing a Proxy header. If the request reaches a vulnerable CGI process, the process can inherit HTTP_PROXY and an outbound client may use the attacker-selected proxy. Outgoing calls can then be routed through an attacker-controlled host, sent to a destination and port chosen by the attacker, or forced through a slow or unavailable proxy to consume resources. The risk concerns server-to-server traffic made after the original request, not merely the response to the attacker.
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The public disclosure dates to July 2016. It identified implementations in PHP, Go, Apache HTTP Server, Tomcat, Nginx CGI scripts, Python’s CGIHandler, HHVM and other CGI-related components. The vulnerability is a namespace collision; it is not a general flaw in every HTTP server or every Python, Go or PHP installation.
“This is not assigned an httpd severity, as it is a defect in other software which overloaded well-established CGI environment variables, and does not reflect an error in HTTP server software.”
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When a server is actually exposed
All of the following conditions must be considered:
- An HTTP request can reach a CGI or CGI-like execution path.
- The request header is copied into the process environment as
HTTP_PROXY. - Application code, a framework or an HTTP client reads that variable, directly or through proxy auto-detection.
- The process can make outbound HTTP requests that would be valuable or expensive to redirect.
Remove any one of these conditions and the attack path is interrupted. A server may run PHP, Python or Go without being vulnerable if it uses an execution model that does not import request headers into a CGI environment. Conversely, a small legacy endpoint can remain vulnerable on an otherwise modern platform.
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Deployment modes to classify
| Execution path | How to assess it | What the disclosure says |
|---|---|---|
| Classic CGI or CGI wrapper | Inspect the wrapper and the environment passed to the application. | Primary exposure pattern when HTTP_PROXY is populated from request data. |
| PHP under CGI | Determine whether PHP receives CGI variables and whether outbound clients honor proxy variables. | Specifically highlighted as requiring the Proxy header to be blocked. |
| Python CGIHandler | Identify handlers that create a CGI environment and check the HTTP client version. | Affected implementation has CVE-2016-1000110. |
| Go CGI | Check use of the CGI package or another CGI bridge rather than the server’s native handler. | Exposure depends strongly on CGI deployment; Go fixes are available from 1.7. |
| Nginx CGI scripts | Look for FastCGI/CGI gateways, scripts and wrappers, not just the Nginx version. | CGI scripts are associated with CVE-2016-1000105. |
| WSGI or FastCGI | Verify what the bridge actually exports and whether a custom wrapper adds request headers. | Described as avoiding the same CGI environment pollution, subject to local configuration. |
| Native modules or non-CGI applications | Search code and runtime settings for proxy auto-detection. | Not automatically vulnerable, but an application can still trust untrusted proxy variables. |
Immediate protection checklist
- Reject or remove
Proxyat the edge. Do this before a request is translated into CGI variables. Rejecting with a client error is easier to monitor; stripping is useful when compatibility requires accepting the request. - Patch the web server and runtime. Install vendor-fixed packages and confirm that distribution backports are present, rather than relying only on the package’s upstream-looking version number.
- Update outbound HTTP clients and frameworks. A patched web server does not repair a library that still reads
HTTP_PROXY. - Inventory every CGI-like endpoint. Include forgotten scripts, administrative paths, test applications, wrappers and alternate virtual hosts.
- Make proxy configuration explicit. Store approved proxy endpoints in deployment configuration, with authentication where required, and do not derive them from request headers.
- Test in a maintenance window. Use a non-production endpoint and a benign header to confirm that the process no longer treats request data as a proxy setting.
Blocking the Proxy header before CGI translation
The edge control is the most reliable first barrier because it protects every application behind the server, including code that has not yet been audited.
Apache HTTP Server
Apache’s mitigation prevents a Proxy: header from populating HTTP_PROXY. The fix was incorporated in Apache 2.4.25 and 2.2.32. On older or unpatched installations, use a virtual-host or server-level rule that either rejects requests carrying the header or removes it before CGI processing. For example, with the rewrite module enabled, an illustrative rejection rule is:
RewriteEngine On
RewriteCond %{HTTP:Proxy} .
RewriteRule ^ - [F]Another approach is to use the header module to unset Proxy early in request processing. Choose one policy, apply it consistently to all relevant virtual hosts, run the server’s configuration test, and verify that the rule executes before the CGI gateway. A rule applied only inside one application directory leaves other CGI paths exposed.
Nginx in front of CGI or FastCGI
Place the filter in the HTTP or server configuration that receives the public request. A simple rejection policy can use a map and a return rule:
map $http_proxy $reject_httpoxy {
default 1;
"" 0;
}
server {
if ($reject_httpoxy) { return 400; }
}Validate the configuration before reloading it and test every listener, including TLS and internal listeners that can reach the same CGI service. If a gateway strips headers, confirm that a later proxy or wrapper does not recreate HTTP_PROXY from an earlier copy of the request.
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CGI wrappers and launch scripts
As a defense in depth, remove the variable immediately before starting the application:
unset HTTP_PROXY
exec /path/to/applicationThis protects the child process from a variable that may have survived an upstream mistake, but it should not replace edge filtering. A wrapper should also define approved proxy variables explicitly if the application needs one, rather than inheriting the entire web-server environment.
Application-level filtering
At the application boundary, treat HTTP_PROXY, http_proxy and related proxy variables as untrusted when they can originate from a request. Clear them or ignore them for request processing, and pass an explicitly configured proxy object or URL to outbound clients. Application filtering is valuable for defense in depth but is the least complete control when several languages or scripts share the same server.
Patch versions and affected components
| Component | Identifier or fixed-version information | Operational action |
|---|---|---|
| PHP CGI | CVE-2016-5385 | Install the supported vendor build, disable obsolete CGI paths where possible, and block the header at the edge. |
| Go | CVE-2016-5386; fixes in 1.7rc3 and stable versions at or above 1.7 | Use a currently supported Go release and verify whether the service uses CGI. |
| Apache HTTP Server | CVE-2016-5387; mitigation in 2.4.25 and 2.2.32 | Upgrade or apply the distributor’s backport, then confirm the request-header rule. |
| Tomcat | CVE-2016-5388 | Apply the vendor’s fixed Tomcat release and inspect connector-to-application environment handling. |
| Nginx CGI scripts | CVE-2016-1000105 | Patch the affected CGI integration and filter the header before the script runs. |
| Python CGIHandler | CVE-2016-1000110 | Replace the vulnerable handler or install the supported patched package; check the HTTP client separately. |
| HHVM | CVE-2016-1000109; NVD lists affected versions before 3.9.6 and specified 3.10–3.14 branches | Use a vendor-fixed release or remove the affected CGI deployment. |
| Python requests | Fixes recorded in 2.7.13, 3.4.6, 3.5.3 and 3.6.0 | Check the exact interpreter and package supplied by the operating-system distribution, including backports. |
These historical versions identify the httpoxy fixes; they are not a recommendation to run an old branch today. Use a currently supported release from your operating-system or language vendor and confirm its security changelog.
Runtime-specific review steps
PHP
Find all virtual hosts and pools that invoke PHP through CGI or a CGI wrapper. A PHP-FPM or FastCGI arrangement is not the same as classic CGI, but custom gateways can still pass arbitrary environment variables. Search application and library code for proxy auto-detection and for direct reads of $_SERVER['HTTP_PROXY'] or equivalent environment access. Set outbound proxy settings in deployment configuration, not from request-derived server variables.
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Python
Separate Python CGIHandler deployments from WSGI servers. For CGIHandler, patch the handler and the HTTP client, then remove the header before the handler executes. For WSGI, inspect middleware and the process launcher: a WSGI server normally avoids CGI environment pollution, but a custom adapter can reintroduce it. Review how the requests library or another client obtains proxy settings and disable ambient environment discovery where the service does not need it.
Go
Determine whether the program is launched through the CGI package or a CGI bridge. A native Go HTTP server has a different request path, while CGI can expose the conflicting environment variable. Update Go and inspect net/http transport configuration. Use an explicit proxy function or a deliberately empty proxy policy instead of allowing arbitrary process environment values to decide routing.
Apache, Nginx and gateway combinations
Map the complete chain: public load balancer, reverse proxy, web server, CGI/FastCGI gateway and application process. Header filtering at only the outermost layer is insufficient if an internal listener is directly reachable or if another gateway accepts the same traffic. Apply the policy at every trust boundary and document which component is responsible for removing the header.
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- List all CGI directories, script aliases, wrappers, legacy virtual hosts and health-check endpoints.
- For each endpoint, record the process owner, launcher, inherited environment and outbound HTTP libraries.
- Search source and configuration for
HTTP_PROXY, lowercase proxy variables, automatic proxy discovery and code that constructs outbound URLs. - Trace whether a request header can become an environment variable at each gateway.
- Identify approved outbound destinations and proxy credentials. Restrict egress so a compromised request cannot reach arbitrary networks.
- Record the patched versions of the web server, runtime, framework and HTTP client, including operating-system backports.
Do not expose an environment-dump endpoint publicly. If one is needed for diagnosis, restrict it to an administrator-only network, remove it after testing and redact credentials.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Safe verification procedure
Test a non-production endpoint during a maintenance window. The goal is to verify both rejection and normal proxy behavior, not to send real credentials through a test proxy.
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- Send a request with a harmless value in the
Proxyheader, for examplecurl -i -H 'Proxy: http://127.0.0.1:9' https://test.example.invalid/health. Replace the example host with an approved test endpoint; do not use a production URL. - Confirm that the edge returns the documented rejection status, or that the CGI process receives no trusted proxy variable after a stripping policy.
- Check server logs for the event without logging sensitive request data.
- Exercise each legitimate outbound integration and confirm it still uses its configured proxy, if any, rather than the test header.
- Repeat the test through every public listener, load-balancer route and legacy CGI endpoint.
A failed test can indicate that the filter is installed in the wrong layer, a different virtual host handled the request, or a wrapper recreated the variable. Correct the path and retest rather than assuming that one successful endpoint proves the whole server is safe.
Choosing a remediation approach
| Approach | Strength | Limitation | Best use |
|---|---|---|---|
| Edge rejection | Stops the request before CGI translation and covers multiple applications. | Requires consistent configuration on every listener. | Default control for internet-facing services. |
| Edge stripping | Preserves compatibility for clients that send an unnecessary header. | Can hide attempted abuse unless logged and monitored. | Controlled environments where rejection would break known clients. |
| CGI-wrapper sanitization | Protects child processes from inherited variables. | Must be repeated for every wrapper and does not stop other paths. | Defense in depth for legacy scripts. |
| Runtime and client patching | Removes known unsafe behavior and improves other security properties. | Does not guarantee that an unpatched gateway never exports the variable. | Required alongside header filtering. |
| Application-only filtering | Can be tailored to a specific client and proxy policy. | Easy to miss in one script or dependency. | Additional safeguard after centralized controls. |
Evaluate each option against five questions: where is the header removed; are the runtime and HTTP client vendor-fixed; is the service CGI, FastCGI, WSGI or another handler; are outbound proxy settings explicit and authenticated; and do regression checks cover every CGI endpoint?
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If you suspect exploitation
Preserve relevant web-server, gateway and outbound-proxy logs, including timestamps, source addresses and destination hosts. Look for unusual proxy destinations, unexpected ports, repeated requests carrying a Proxy header and outbound calls that began immediately after such requests. Rotate credentials that may have been sent through an unauthorized proxy, block suspicious egress destinations and isolate affected CGI applications while preserving evidence.
After containment, remove the header at the edge, patch the complete software chain, review outbound-request logs for the applicable retention period and rerun the endpoint inventory. Treat an absence of obvious log entries as inconclusive if outbound logging was not enabled.
Ongoing maintenance checklist
- Keep a supported web-server, runtime and HTTP-client version in production.
- Test the
Proxy-header policy whenever a reverse proxy, CGI wrapper or virtual host changes. - Alert on inbound
Proxyheaders and on outbound connections to unapproved destinations. - Use explicit, authenticated proxy configuration when an application genuinely requires one.
- Limit egress from CGI processes to the destinations they need.
- Retire obsolete CGI scripts and replace them with a maintained execution model where practical.
- Repeat the audit after framework, operating-system or gateway upgrades.
The practical verdict is straightforward: block or remove Proxy before CGI environment creation, patch every affected component, and prove through deployment-wide testing that request data cannot control outbound proxy routing.
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