7a69Adv#13 - USRobotics AP Wireless Denial of Service
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
- ------------------------------------------------------------------
7a69ezine Advisories 7a69Adv#13
- ------------------------------------------------------------------
http://www.7a69ezine.org [02/08/2004]
- ------------------------------------------------------------------
Title: USRobotics AP Wireless Denial of Service
Author: Albert Puigsech Galicia - <ripe@xxxxxxxxxxxxx>
Software: Embedded HTTP server
Versions: 1.21h
Remote: yes
Exploit: yes
Severity: High
- ------------------------------------------------------------------
I. Introduction
USRobotics is an important company that build lot of network devices,
like
modems, wireless cards or wireless access points. It builds also Robots (as
you can see on "I, Robot" film). To get more information about this company
you can visit the official website at http://www.usrobotics.com.
II. Description
The USR808054 wireless access point may be administered using HTTP
protocol,
so the firmwire includes a little HTTP server. The last version of this
server has a critical buffer overflow that allow malicious users on the
network to produce a denial of service or the execution of arbitrary code.
III. Exploit
A buffer overflow appears on HTTP version string in GET request. You
can do
the request without administrator password, so all users on the network
allowed to connect to http port (all by default) can exploit this issue.
This is a exploit code using perl:
bash ~ $ perl -e '$a = "GET / " . "A"x250 . "\r\n\r\n" ; print $a' | nc
ap 80
It crashes down the access point and disconnect all wireless users to
the
network. May be also posible (with knowledge about the architecture used by
USRobotics) to exploit the vulnerability to execute arbitrary code and get
total control to the device.
IV. Patch
Not yet.
V. Timeline
19/07/2004 - Notified to spain_modemsupport@xxxxxxx
- No reply
VI. Extra data
I have only tested this vulnerability on my USR808054, but other USR
products
may be also affected.
- --
- -----------------------------------------------------------------------
Albert Puigsech Galicia
http://www.7a69ezine.org/~apuigsech
- -----------------------------------------------------------------------
Este e-mail puede contener información confidencial y/o privilegiada.
Si el presente mensaje no va dirigido a su persona (o lo ha recibido
por error) por favor, notifíquelo inmediatamente al emisor y destruya
este e-mail. Cualquier divulgación, copia o distribución no autorizada
del material contenido en este e-mail queda prohibida.
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.2.4 (GNU/Linux)
iD8DBQFBDcyYiLW5f5WBvGcRAmQAAJ95CHJnT1AKiQ/mq6lXhJbGspIdNwCdEC+b
agHJzXOTEyiGwq+8+y5zzOg=
=6YBo
-----END PGP SIGNATURE-----