Script `http-shellshock`

Script types: portrule
Categories: exploit, vuln, intrusive
Download: https://svn.nmap.org/nmap/scripts/http-shellshock.nse

Script Summary

Attempts to exploit the "shellshock" vulnerability (CVE-2014-6271 and CVE-2014-7169) in web applications.

To detect this vulnerability the script executes a command that prints a random string and then attempts to find it inside the response body. Web apps that don't print back information won't be detected with this method.

By default the script injects the payload in the HTTP headers User-Agent, Cookie, and Referer.

Vulnerability originally discovered by Stephane Chazelas.

References:

Script Arguments

http-shellshock.uri: URI. Default: /
http-shellshock.header: HTTP header to use in requests. Default: User-Agent
http-shellshock.cmd: Custom command to send inside payload. Default: nil
slaxml.debug: See the documentation for the slaxml library.
http.host, http.max-body-size, http.max-cache-size, http.max-pipeline, http.pipeline, http.truncated-ok, http.useragent: See the documentation for the http library.
smbdomain, smbhash, smbnoguest, smbpassword, smbtype, smbusername: See the documentation for the smbauth library.
vulns.short, vulns.showall: See the documentation for the vulns library.

Example Usage

nmap -sV -p- --script http-shellshock <target>
nmap -sV -p- --script http-shellshock --script-args uri=/cgi-bin/bin,cmd=ls <target>

Script Output

PORT   STATE SERVICE REASON
80/tcp open  http    syn-ack
| http-shellshock:
|   VULNERABLE:
|   HTTP Shellshock vulnerability
|     State: VULNERABLE (Exploitable)
|     IDs:  CVE:CVE-2014-6271
|       This web application might be affected by the vulnerability known as Shellshock. It seems the server
|       is executing commands injected via malicious HTTP headers.
|
|     Disclosure date: 2014-09-24
|     References:
|       http://www.openwall.com/lists/oss-security/2014/09/24/10
|       https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-7169
|       http://seclists.org/oss-sec/2014/q3/685
|_      http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-6271

Requires

Authors:

Paulino Calderon <calderon()websec.mx
Paul Amar <paul()sensepost com>