D-Link Router UPNP Stack Overflow

2006-07-22T00:00:00
ID SECURITYVULNS:DOC:13538
Type securityvulns
Reporter Securityvulns
Modified 2006-07-22T00:00:00

Description

D-Link Router UPNP Stack Overflow

Release Date: July 13, 2006

Date Reported: February 27, 2006

Patch Development Time (In Days): 136

Severity: High (Remote Code Execution)

Vendor: D-Link

Routers Affected:

DI-524 Rev A DI-524 Rev C DI-524 Rev D DI-604 Rev E DI-624 Rev C DI-624 Rev D DI-784 Rev A EBR-2310 Rev A WBR-1310 Rev A WBR-2310 Rev A

Overview:

A remote stack overflow exists in a range of wired and wireless D-Link routers. This vulnerability allows an attacker to execute privileged code on an affected device. When a specific request is sent to an affected device, a traditional stack overflow is triggered allowing an attacker complete control of the router. With the ability to execute code on the device, it is then possible to apply modified firmware, and ultimately compromise the entire network.

The Universal Plug and Play (uPnP) stack on many D-Link devices is vulnerable to a traditional remote stack overflow. This vulnerability exists on the Local Area Network (LAN) interface of affected D-Link devices. Due to the ease in which one can gain access to the LAN interface of wireless devices, this attack is remote in nature.

Technical Details:

The vulnerability exists within the M-SEARCH function. By issuing an M-SEARCH request with an overly long parameter (approximately 800 bytes), a stack overflow is triggered and an attacker can reliably execute code of his/her choosing. This can be accomplished without affecting network connectivity and without any signs of exploitation. In some exploitation cases, the payload may require a soft-reset on the device, interrupting connectivity for a brief moment.

The following request to UDP port 1900 will trigger the stack overflow:

M-SEARCH <800 byte string> HTTP/1.0

Information on exploiting vulnerabilities within embedded systems is scarce. To successfully debug hardware devices you will generally require external hardware for the debugging interface.

I will be giving a presentation at SyScan '06 (http://www.syscan.org) that will demonstrate exactly how to analyze, debug, and exploit embedded devices.

A previous lecture demonstrates the compromise of a network via an exploitable router, these slides are available for download from:

http://www.blackhat.com/presentations/bh-europe-06/bh-eu-06-Jack.pdf

Vendor Status:

D-Link has released updates for all affected routers and they are available for download from the D-Link website. (http://www.dlink.com)

Credit: Barnaby Jack

Greetings:

B-boys and Fly-girls

Copyright (c) 1998-2006 eEye Digital Security Permission is hereby granted for the redistribution of this alert electronically. It is not to be edited in any way without express consent of eEye. If you wish to reprint the whole or any part of this alert in any other medium excluding electronic medium, please email alert (at) eEye (dot) com [email concealed] for permission.

Disclaimer The information within this paper may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are no warranties, implied or express, with regard to this information. In no event shall the author be liable for any direct or indirect damages whatsoever arising out of or in connection with the use or spread of this information. Any use of this information is at the user's own risk.