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Category:   Application (Web Server/CGI)  >   BremsServer Vendors:   herberlin.de
BremsServer Input Validation Flaw Discloses Files to Remote Users
SecurityTracker Alert ID:  1008853
SecurityTracker URL:  http://securitytracker.com/id/1008853
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Jan 26 2004
Impact:   Disclosure of authentication information, Disclosure of system information, Disclosure of user information, Execution of arbitrary code via network, Modification of user information
Vendor Confirmed:  Yes  Exploit Included:  Yes  
Version(s): 1.2.4
Description:   An input validation vulnerability was reported in BremsServer. A remote user can view files on the system. A remote user can also conduct cross-site scripting attacks.

Donato Ferrante reported that a remote user can supply a specially crafted URL containing '../' directory traversal characters to view arbitrary files on the target system with the privileges of the web service.

A demonstration exploit URL is provided:

http://[target]/../PATH/windows/system.ini

It is also reported that the web server does not filter HTML code from user-supplied input before displaying messages that contain the input. A remote user can create a specially crafted URL that, when loaded by a target user, will cause arbitrary scripting code to be executed by the target user's browser. The code will originate from the site running the BremsServer software and will run in the security context of that site. As a result, the code will be able to access the target user's cookies (including authentication cookies), if any, associated with the site, access data recently submitted by the target user via web form to the site, or take actions on the site acting as the target user.

A demonstration exploit URL is provided:

http://[target]/<script>alert("Test")</script>

Impact:   A remote user can view files on the system located outside of the web document directory. Files can be viewed with the privileges of the web service.

A remote user can access the target user's cookies (including authentication cookies), if any, associated with the site running the BremsServer software, access data recently submitted by the target user via web form to the site, or take actions on the site acting as the target user.

Solution:   No solution was available at the time of this entry. The report indicates that the vendor will fix the flaws in the next version.
Vendor URL:  www.herberlin.de/bremsserver.php (Links to External Site)
Cause:   Access control error, Input validation error
Underlying OS:  Linux (Any), UNIX (Any), Windows (Any)

Message History:   None.


 Source Message Contents

Subject:  Directory traversal and XSS in BremsServer 1.2.4


                           Donato Ferrante


Application:  BremsServer 
              http://www.herberlin.de/

Version:      1.2.4

Bugs:         directory traversal and cross site scripting

Author:       Donato Ferrante
              e-mail: fdonato@autistici.org
              web:    www.autistici.org/fdonato


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1. Description
2. The bugs
3. The code
4. The fix


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----------------
1. Description:
----------------

Vendor's Description:

"Herberlin BremsServer is a small HTTP server you can use to test your 
web pages on your local machine."


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-------------
2. The bugs:
-------------

[1] directory traversal bug, the program does't make a good check on
    the user input string ( /../ ) so an attacker is able to see and
    download all the files on the remote system simply using his
    browser.

[2] cross site scripting bug, the program doesn't make a full check
    on the strings sent by the client, in fact the input strings are
    not filtered and they will appear in the returned page.



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-------------
3. The code:
-------------

To test the vulnerabilities:


[1]

http://[host]/../PATH/windows/system.ini


[2]

http://[host]/<script>alert("Test")</script>



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------------
4. The fix:
------------

Bugs will be fixed in the next version of BremsServer. So go on the
BremsServer's official web site: http://www.herberlin.de/
and check for a new version.



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