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Home arrow SecurityAlert Database

Arrow  Topic :

Flaw in AVM UPNP service for windows


Arrow  SecurityAlert : 2159
Arrow  CVE : CVE-2007-0357
Arrow  SecurityRisk : Low  Security Risk Low  (About)
Arrow  Remote Exploit : Yes
Arrow  Local Exploit : No
Arrow  Exploit Available : Yes
Arrow  Credit : DPR
Arrow  Published : 19.01.2007

Arrow  Affected Software : Fritz!DSL



Arrow  Advisory Content :  

- Description
The "AVM IGD CTRL Service", a Universal Plug and Play (UPNP) service for
windows, which is part of the software package "Fritz!DSL Software
02.02.29" provides the possibility to read any file on the windows
system partition for any user - no matter how much restricted rights the
user has.
It is even possible to read files from any LAN computer on which this
service is running and it is possible to read critical system files (SAM
DB copies, profile files of any user) because the service is running
under the (locally) most privileged system account.

The mentioned software package is shipped with VOIP routers from the
german company AVM (www.avm.de).


- Reproduction
Relative URLs for the AR7 webserver (which is part of the mentioned UPNP
service) can be used to read files on the system partition. Because
backslashes can't be directly used in a URL "%5C" has to be used.

Examples for local and remote files of LAN computers:
http://localhost:49001/..%5C..%5C..%5Cwindows%5Csystem.ini
http://192.168.178.20:49001/..%5C..%5C..%5Cwindows%5Csystem.ini


- Workaround
Disable the "AVM IGD CTRL Service" under the services control panel.


Regards,

--

DPR






















Arrow  Feedback :

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