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"NETGEAR SSL312 Router - Denial of Service"

Author

Exploit author

Rembrandt

Platform

Exploit platform

hardware

Release date

Exploit published date

2009-02-09

Download file

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_   _ _____ _     ___ _____ _   _
                   / / / / ____/ /   /  _/_  __/ / / /
                  / /_/ / __/ / /    / /  / / / /_/ /
                 / __  / /___/ /____/ /  / / / __  /
                /_/ /_/_____/_____/___/ /_/ /_/ /_/
                           Helith - 0815
--------------------------------------------------------------------------------

Author		 : Rembrandt
Date		 : 2008-02-27
Affected Software: propietary CGI
Affected OS	 : Netgear embedded Linux for the SSL312 router
		   Propably other devices are affected as well
Type		 : Denial of Service

OSVDB		 : 
Milw0rm		 : 8008
CVE		 : 
ISS X-Force:	 : 
BID		 : 33675


Trying to fix it responsible and get in contact with the vendor:

-- ZDI --
Case Opened  	2008-12-28 07:57 GMT-6
Case Closed 	2009-01-15 17:01 GMT-6

"After some deliberation we have unfortunately decided that we won't be
accepting bugs affecting NetGear products."
-- END --

Contacting Netgear and mitre.org: 2009-02-01 12:25 GTM+1
No reaction, release		: 2009-02-06 23:59 GTM+1

Netgear VPN router SSL312 is proune to a remote DoS condition which can get
triggered if somebody has access to the webinterface of the VPN router.
The problem is related to a propietary CGI binary and makes is impossible
for users to patch the router. Further in detail analyses will show several
other issues like outdated third party software (e.g. the webserver) and further
problems in the cgi-binary itself which won't get disclosed here.

If you download the source code the affected binary can be found at:
./NG_SSL312-GPL/uClinux/uC-src/real/EasyAccess/EasyAccess/www/cgi-bin/single_cgi


Steps to reproduce:

Visit the Netgear SSL312 VPN router webinterface.
You will see a login field and a password field.
Just enter any random data and proceed.

The URL will include a path like:
https://xxx.xxx.xxx.xxx/cgi-bin/welcome/VPN_only?err=VXNlciBMb2dpbiBGYWlsZWQ=

If you modify the URL as below and resend your http request the device will
crash and needs a hard reboot.

https://xxx.xxx.xxx.xxx/cgi-bin/welcome/VPN_only?../../../../../

Example network affected by this: StudiVZ

Simple google dork:
intitle:SSL-VPN intext:password inurl:/cgi-bin/welcome

Workaround:
Preventing others to gain access to the webinterface of the router prevents
the attack.

Kind regards,
Rembrandt

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Release Date Title Type Platform Author
2009-04-30 "Multiple Vendor - PF Null Pointer Dereference" dos bsd Rembrandt
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2008-06-18 "Screen 4.0.3 (OpenBSD) - Local Authentication Bypass" local linux Rembrandt 
import requests
response = requests.get('http://127.0.0.1:8181?format=json')

For full documentation follow the link above

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