full-disclosure - Samsung ADSL Modem Vulnerability

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Date: Thu Mar 24 20:19:22 2005
From: se_cur_ity at hotmail.com (Morning Wood)
Subject: Samsung ADSL Modem Vulnerability

for clarity..  all items are available via WAN by default

updated Advisory at 
http://exploitlabs.com/files/advisories/EXPL-A-2005-002-samsung-adsl.txt

----- Original Message ----- 
From: "Morning Wood" <se_cur_ity@...mail.com>
To: <full-disclosure@...ts.grok.org.uk>
Sent: Monday, March 21, 2005 12:51 PM
Subject: [Full-disclosure] Samsung ADSL Modem Vulnerability


> ------------------------------------------------------------
>      - EXPL-A-2005-002 exploitlabs.com Advisory 031 -
> ------------------------------------------------------------
>                        - Samsung ADSL Modem -
> 
> 
> 
> 
> 
> 
> AFFECTED PRODUCTS
> =================
> Samsung ADSL Modem
> 
> Samsung Eletronics
> http://www.samsung.com
> 
> 
> DETAILS
> =======
> 1. Arbitrary reading of files
> 2. Default root password
> 3. root file system access
> 
> 
> Known issues exist in Boa httpd as per:
> FreeBSD-SA-00:60 Security Advisory
> 
> http://www.securiteam.com/unixfocus/6G0081P0AI.html and
> http://lists.insecure.org/lists/bugtraq/2000/Oct/0445.html
> 
> note:
>  This is a hardware based product with built in httpd for
>  remote access, this is a seperate issue than the ones
>  formaly presented above, but carry the same implications.
> 
> 
> Identification:
> 
> HTTP/1.0 400 Bad Request
> Date: Sat, 03 Jan 1970 17:57:18 GMT
> Server: Boa/0.93.15
> Connection: close
> Content-Type: text/html
> 
> Modem vendor Samsung Electronics (co) modem 
> co chipset vendor b500545354430002 
> cpe chipset vendor Samsung Electronics (co) cpe chipset 
> software version  SMDK8947v1.2 Jul 11 2003 10:00:01 
> ADSL DMT version a-110.030620-10130710
> 
> 
> Samsung ADSL modems run uClinux OS
> http://www.uclinux.com
> 
> note:
> Depending on the implimentation, other products
> using a combination of Boa / uClinux may be
> affected as well.  
> 
> 
> Item 1
> =====
> http://[someSamsung.ip]/etc/passwd
> http://[someSamsung.ip]/etc/hosts
> http://[someSamsung.ip]/bin/
> http://[someSamsung.ip]/dev/
> http://[someSamsung.ip]/lib/
> http://[someSamsung.ip]/tmp/
> 
> http://[someSamsung.ip]/var/ppp/chap-secrets
> 
> http://[someSamsung.ip]/bin/sh
> 
> Any remote user may request any file present
> in the router/modem OS file system.
> Files can be fetched unauthenticated via a
> GET request in a browser.
> 
> 
> Item 2
> =====
> Default user login / passwords exist in both
> httpd ( http://[host]/cgi-bin/adsl.cgi) and telnet ports
> 
> root/root
> admin/admin
> user/user
> 
> 
> Item 3
> ======
> By telneting to the device and loging in as
> root/root, remote users my access the filesystem.
> The modem provides 256mb of ram for OS and
> file system operations. In this implimentation
> there is aprox 120mb free file system space
> which allows for the posibility for remote
> attackers to use the file system for malicious
> communication and file storage. This allows
> many scenarios such as a storing worm and/or
> viral code.
> 
> #echo "some bad data" >file
> 
> 
> 
> SOLUTION:
> =========
> none to date
> 
> Samsung has been contacted
> No patch released
> 
> 
> 
> Credits
> =======
> This vulnerability was discovered and researched by 
> Donnie Werner of exploitlabs
> 
> Donnie Werner
> 
> mail: morning_wood@...e-h.org
> -- 
> web: http://exploitlabs.com
> web: http://zone-h.org