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July 21st, 2011 on 6:45 am
Excellent post, it’s the most complete information on building a Peach pit and using Peach fuzzer to it’s full extend.
July 21st, 2011 on 12:39 pm
Very good article! Do you mind if I translate it into Russian and will publish on its website?
July 21st, 2011 on 2:31 pm
Certainly. Please don’t modify the content or remove references to the original source.
August 3rd, 2011 on 10:17 am
hi, i’m run peach 2.3.9 but get an error at rand.py on line 59. Did you fix that in peach?
Can you share me the way you fix?
Regards,
Sorry for my bad english !
August 4th, 2011 on 10:08 am
Could you provide me with a bit more detail on the error?
August 12th, 2011 on 6:01 pm
do you sure that the second block of the element will be generated? I think that the only first block will be output.
see:
http://groups.google.com/group/peachfuzz/browse_thread/thread/ee2f3429856df70d/10f904c8fd3b9d90?lnk=gst&q=choice#10f904c8fd3b9d90
August 12th, 2011 on 6:01 pm
element: Choice
August 12th, 2011 on 8:06 pm
xssww2: Short answer, yes. If you’re referring to the “dd_chooser” choice element, it’ll first begin cracking the “dd_64” block. If the constraint fails, Peach will discard this block and select the “dd_32.” If this fails as well neither block will be chosen and Peach will move to the next major block in the list. If you’re seeing otherwise please let me know.
August 29th, 2011 on 4:50 am
] Peach 2.3.9 DEV Runtime
] Copyright (c) Michael Eddington
[*] Optmizing DataModel for cracking: ‘ZipFileFormat’
[*] Cracking data from C:\fuzz\test.zip into ZipFileFormat
[*] Total time to crack data: 0.08
[*] Building relation cache
Traceback (most recent call last):
File “C:\Peach\\peach.py”, line 393, in
parser.asParser(args[0])
File “C:\Peach\Peach\Analyzers\pit.py”, line 57, in asParser
return parser.parse(uri)
File “C:\Peach\Peach\Engine\parser.py”, line 161, in parse
obj = self.HandleDocument(doc, uri)
File “C:\Peach\Peach\Engine\parser.py”, line 364, in HandleDocument
tests = self.HandleTest(child, None)
File “C:\Peach\Peach\Engine\parser.py”, line 2464, in HandleTest
test.mutator = self.HandleFuzzingStrategy(child, test)
File “C:\Peach\Peach\Engine\parser.py”, line 2511, in HandleFuzzingStrategy
exec(“strategy = PeachXml_%s(node, parent)” % cls)
File “”, line 1, in
File “C:\Peach\Peach\MutateStrategies\rand.py”, line 59, in __init__
RandomMutationStrategy.SEED = Engine.context.SEED
AttributeError: ‘NoneType’ object has no attribute ‘SEED’
August 30th, 2011 on 2:12 am
Without the syntax that caused this error I can’t be certain but I imagine you’re seeing this error when running”peach.bat -t zip.xml”. I’m not sure why but Peach will throw an error when running the syntax test with the random mutation strategy enabled in the PIT. To run a syntax check, simply comment out the “Strategy” element within your test model. To use it during fuzzing remove the comment.
August 30th, 2011 on 1:24 pm
thanks,pyoor,it works now
November 29th, 2011 on 1:39 am
Hi, nice guide.
From my understanding, this process will fuzz the test.zip, and check by cutezip. Am I right?
If I just want to fuzz the test.zip file, and save the fuzzed zip file to some place. No need to monitor and check, just need the fuzzed result. What should I do?
Thanks.
November 29th, 2011 on 4:49 am
Jinghao,
Yes, you are correct.
Also, have a look at the following:
http://peachfuzzer.com/HowDoI#Generate_All_Fuzzed_Files
This will generate all fuzzed files and write them to disk.
December 6th, 2011 on 5:52 am
When I use this xml to fuzz, the CPU usage will grow up quickly. Then the whole system will be hang. It is very strange.
Thanks,
-Jinghao
December 7th, 2011 on 12:59 am
Jinghao,
This is more than likely dependent on the application you’ve chosen to fuzz. Once the sample file has been cracked, Peach uses very little resources for the actual fuzz process. Try looking at alternative monitors available in Peach as this may cause the application to spike in CPU usage.
December 12th, 2011 on 2:31 am
Thanks for your reply.
Actually, I don’t use any monitor. I just generated the fuzzed files. And after remove the random Strategy, it will be OK. I don’t know why. Thanks.
February 2nd, 2012 on 12:30 pm
Hi pyoor,
Excellent writeup. Thanks for your patience.
I tried to generate fuzz files using your datamodel. I am receiving the following error while executing “peach.bat zip.xml”. I didnt receive syntax errors by the way. Any help would be appreciated. Thanks
] Peach 2.3.8 Runtime
] Copyright (c) Michael Eddington
[*] Starting run “DefaultRun”
[-] Test: “TheTest” (None)
[1:?:?] Element: N/A
Mutator: N/A
‘PK\x01\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\
x00\x00\x00\x00\x00\x00\x00’
”
‘PK\x01\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\
x00\x00\x00\x00\x00\x00\x00’
(, AttributeError(“ExpressionFixup instance ha
s no attribute ‘getRoot'”,), )
[1:?:?] Caught error on receave, ignoring [None]
Traceback (most recent call last):
File “peach.py”, line 516, in
File “Peach\Engine\engine.pyo”, line 471, in Run
File “Peach\Engine\engine.pyo”, line 678, in _runTest
File “Peach\Engine\state.pyo”, line 136, in run
File “Peach\Engine\state.pyo”, line 253, in _runState
File “Peach\Engine\dom.pyo”, line 2851, in getValue
File “Peach\Engine\dom.pyo”, line 2363, in getValue
File “Peach\Engine\dom.pyo”, line 2976, in getRawValue
File “Peach\Engine\dom.pyo”, line 2918, in getInternalValue
File “Peach\Engine\dom.pyo”, line 2363, in getValue
File “Peach\Engine\dom.pyo”, line 3402, in getRawValue
File “Peach\Engine\dom.pyo”, line 3334, in getInternalValue
File “Peach\Engine\dom.pyo”, line 2363, in getValue
File “Peach\Engine\dom.pyo”, line 3402, in getRawValue
File “Peach\Engine\dom.pyo”, line 3334, in getInternalValue
File “Peach\Engine\dom.pyo”, line 2363, in getValue
File “Peach\Engine\dom.pyo”, line 3626, in getRawValue
File “Peach\Engine\dom.pyo”, line 3539, in getInternalValue
File “Peach\Engine\dom.pyo”, line 2233, in getRelationValue
File “Peach\Engine\dom.pyo”, line 2313, in getSize
File “Peach\Engine\dom.pyo”, line 2363, in getValue
File “Peach\Engine\dom.pyo”, line 4123, in getRawValue
File “Peach\Engine\dom.pyo”, line 4100, in getInternalValue
File “Peach\fixup.pyo”, line 60, in dofixup
File “Peach\Fixups\checksums.pyo”, line 58, in fixup
File “Peach\Engine\common.pyo”, line 190, in evalEvent
File “Peach\Engine\common.pyo”, line 111, in buildImports
AttributeError: ExpressionFixup instance has no attribute ‘getRoot’
February 13th, 2012 on 4:56 pm
Steven,
Are you running the latest svn of Peach? Some of the features included in those pits are only available via svn. If you’re still having issues let me know.
July 11th, 2012 on 12:52 pm
I’m trying to use your PeachPit file, but I get the following error. Do you know what I’m doing wrong?
C:\peach\zip>c:\peach\peach -t zip.xml
] Peach 2.3.8 Runtime
] Copyright (c) Michael Eddington
[*] Optmizing DataModel for cracking: ‘ZipFileFormat’
[*] Cracking data from C:\peach\samples\MPlayer-mingw32-1.0pre8.zip into ZipFile
Format
Traceback (most recent call last):
File “peach.py”, line 392, in
File “Peach\Analyzers\pit.pyo”, line 57, in asParser
File “Peach\Engine\parser.pyo”, line 161, in parse
File “Peach\Engine\parser.pyo”, line 351, in HandleDocument
File “Peach\Engine\parser.pyo”, line 2885, in HandleStateMachine
File “Peach\Engine\parser.pyo”, line 2907, in HandleState
File “Peach\Engine\parser.pyo”, line 3043, in HandleAction
File “Peach\Engine\dom.pyo”, line 1245, in setDefaults
File “Peach\Engine\incoming.pyo”, line 171, in crackData
File “Peach\Engine\incoming.pyo”, line 1020, in _handleNode
File “Peach\Engine\incoming.pyo”, line 1733, in _handleBlock
File “Peach\Engine\incoming.pyo”, line 858, in _handleNode
File “Peach\Engine\incoming.pyo”, line 728, in _handleArray
File “Peach\Engine\dom.pyo”, line 825, in __delitem__
KeyError: ‘LocalFileHeader’
C:\peach\zip>
July 13th, 2012 on 3:35 pm
Chris,
The zip.xml pit requires the latest version of PIT (2.3.9 DEV). You can pull it down using the following SVN resource:
svn co https://peachfuzz.svn.sourceforge.net/svnroot/peachfuzz/branches/Peach2.3/ peach2.3
July 23rd, 2012 on 7:50 am
Thanks! I pulled down the latest version, but I still get an error:
C:\Peach2.3>peach -t zip\zip.xml
] Peach 2.3.9 DEV Runtime
] Copyright (c) Michael Eddington
[*] Optmizing DataModel for cracking: ‘ZipFileFormat’
[*] Cracking data from C:\Peach2.3\samples\samples.zip into ZipFileFormat
[*] Total time to crack data: 0.15
[*] Building relation cache
Traceback (most recent call last):
File “C:\Peach2.3\\peach.py”, line 393, in
parser.asParser(args[0])
File “C:\Peach2.3\Peach\Analyzers\pit.py”, line 57, in asParser
return parser.parse(uri)
File “C:\Peach2.3\Peach\Engine\parser.py”, line 161, in parse
obj = self.HandleDocument(doc, uri)
File “C:\Peach2.3\Peach\Engine\parser.py”, line 364, in HandleDocument
tests = self.HandleTest(child, None)
File “C:\Peach2.3\Peach\Engine\parser.py”, line 2464, in HandleTest
test.mutator = self.HandleFuzzingStrategy(child, test)
File “C:\Peach2.3\Peach\Engine\parser.py”, line 2511, in HandleFuzzingStrategy
exec(“strategy = PeachXml_%s(node, parent)” % cls)
File “”, line 1, in
File “C:\Peach2.3\Peach\MutateStrategies\rand.py”, line 59, in __init__
RandomMutationStrategy.SEED = Engine.context.SEED
AttributeError: ‘NoneType’ object has no attribute ‘SEED’
July 23rd, 2012 on 8:49 am
Sorry, I didn’t read the other comments. It works now!
July 23rd, 2012 on 12:56 pm
Hello again,
Now I’ve been trying to use minset for a while, but I get this error:
C:\Peach2.3\tools\minset>minset -s zip\*.zip -m minset “C:\Program Files\7-Zip\7
z.exe” %s
] Peach Minset Finder v0.10
] Copyright (c) Michael Eddington
[*] Performing code coverage traces with 12 files
[*] Determining coverage with [zip\bzip2.zip]
E: Failed to allocate Injector, Error = INJECTOR_ERR_NO_ACTIVE_SERVER
E:Pin is exiting due to fatal error
Traceback (most recent call last):
File “minset.py”, line 468, in
options.needsKilling)
File “minset.py”, line 356, in runCoverage
(sampleFileMostCoverage, sampleFileMostCoverageCount ) = self.runTraces(comm
and, sampleFiles, None, needsKilling)
File “minset.py”, line 323, in runTraces
bbl = self.getCoverage(cmd, sampleFile)
File “minset.py”, line 282, in getCoverage
cmd)
File “C:\Python27\lib\os.py”, line 608, in spawnl
return spawnv(mode, file, args)
OSError: [Errno 0] Error
Do you know what I’m doing wrong here?
July 24th, 2012 on 3:40 pm
Hrmm. No not entirely sure but I’d try wrapping %s in quotes (“%s”).
October 21st, 2012 on 6:19 pm
FYI:
The linked CuteZip appears to be corrupted (Installing in Windows 7 fails). However, I was able to download a copy from archive.org that installed and I was able to verify that it has the example vulnerability.
Link: http://archive.org/details/tucows_312509_CuteZIP
December 8th, 2013 on 2:44 pm
What version of Peach you used for this tutorial?
I’m using windows xp sp3 and peach 2.3.9 but got this error :
http://pastebin.com/8SFjwHyc
what’s wrong?
following command not work too :
peach.bat samples\DebuggerWindows.xml
but i have peach 3 installed and when use peach.bat with DebuggerWindows.xml works well but not work with zip.xml
December 10th, 2013 on 2:03 pm
Mehdi,
You’re missing the ‘win32process’ module. Also, the zip.xml Peach pit will not work under Peach 3 without modifying it first. Peach 3 has significantly changed the pit format.
December 10th, 2013 on 1:25 pm
Hi Pyoor,
Thanks for this wonderful website!
I am new to Peach and learning it everyday. I have a bit of confusion related with Size Relation:
As size of “lfh_FileNameLen” would be derived from “lfh_FileName”, whats the use of defining size in below line:
<Number name="lfh_FileNameLen" size=”16″ endian=”little” signed=”false”>
Could you please help me understand this.
G.
December 10th, 2013 on 2:08 pm
GetGoing,
The Zip specification requires a field which identifies the size in characters of the filename length. The reason we specify a size relation here is that if Peach manipulates either the lfh_FileNameLen or lfh_FileName elements, it can then update the corresponding fields accordingly. For instance, if Peach mutates the lfh_Filename field to “AAAAAAAAAA”, it can then update the lfh_FileNameLen to 10. The caveat here is that may or may not happen depending on the mutation strategy in use.
December 10th, 2013 on 5:06 pm
Thanks a lot the clarifies 🙂
December 10th, 2013 on 5:08 pm
Sorry for typo…Thanks a lot that answers my query
December 10th, 2013 on 5:11 pm
Hi Pyoor,
I have a query on load from file in peach:
Wondering if you have used it
My sample data is in .pcap format (network packet), do I just need to change the extension of my .pcap files to .bin or is there a different approach here?
Thanks,
G.
January 19th, 2015 on 1:14 pm
Im close to five years late. I hope its not a problem. This is still the most detailed zip format implementation of the internet. Im running into the following error. What do you think my problem is.
C:\Peach2.3.9>peach.bat -t samples\zip.xml
] Peach 2.3.9 DEV Runtime
] Copyright (c) Michael Eddington
[*] Optmizing DataModel for cracking: ‘ZipFileFormat’
[*] Cracking data from C:\fuzz\zip\150.zip into ZipFileFormat
[*] Total time to crack data: 0.00
[*] Building relation cache
eocd_OffsetToCenDir
Parent:
DataRoot:
DataRoot.parent:
Fullname: ZipFileFormat.EndOfCentralDirectoryRecord.eocd_OffsetToCenDir.Named_4
Couldn’t locate [LocalFileHeader] size
template: ZipFileFormat: parent
block: ArchiveExtraDataRecord: parent
string: aedr_Sig: parent
number: aedr_ExtFldLen: parent
blob: aedr_ExtFld: parent
block: CentralDirectoryStructure: parent
block: FileHeader: parent
string: cfh_Signature: parent
number: cfh_Ver: parent
number: cfh_VerReq: parent
flags: cfh_BitFlag: parent
flag: cfh_bf_Encrypted: parent
flag: cfh_bf_CompMethod1: parent
flag: cfh_bf_CompMethod2: parent
flag: cfh_bf_Zeroed: parent
flag: cfh_bf_Deflate: parent
flag: cfh_bf_Patched: parent
flag: cfh_bf_Strong: parent
flag: cfh_bf_Unused1: parent
flag: cfh_bf_Unused2: parent
flag: cfh_bf_Unused3: parent
flag: cfh_bf_Unused4: parent
flag: cfh_bf_EFS: parent
flag: cfh_bf_Reserved1: parent
flag: cfh_bf_Enc_Cd: parent
flag: cfh_bf_Reserved2: parent
flag: cfh_bf_Reserved3: parent
number: cfh_CompMethod: parent
number: cfh_LastModTime: parent
number: cfh_LastModDate: parent
number: cfh_CRC32: parent
number: cfh_CompSize: parent
number: cfh_DecompSize: parent
number: cfh_FileNameLen: parent
number: cfh_ExtraFldLen: parent
number: cfh_FileCommLen: parent
number: cfh_DiskNumStart: parent
number: cfh_IntFileAttrib: parent
number: cfh_ExtFileAttrib: parent
number: cfh_RelOffsetLFH: parent
string: cfh_FileName: parent
string: cfh_FldName: parent
string: cfh_FileComment: parent
block: CDSDigitalSignature: parent
string: cdsds_Signature: parent
number: cdsds_DataSize: parent
blob: cdsds_Data: parent
block: Zip64EndOfCentralDirectoryRecord: parent
string: z64eocd_Signature: parent
number: z64eocd_SizeOfRecord: parent
block: CentralDirectoryRecord: parent
number: z64eocd_VerMadeBy: parent
number: z64eocd_VerNeeded: parent
number: z64eocd_ThisDiskNum: parent
number: z64eocd_SofCDDiskNum: parent
number: z64eocd_CDOnDisk: parent
number: z64eocd_TotNumEntries: parent
number: z64eocd_SizeOfCenDir: parent
number: z64eocd_OffsetToCenDir: parent
block: z64eocd_Z64ExtensDS: parent
number: z64eocd_ExtensDs_Header: parent
number: z64eocd_ExtensDs_Size: parent
blob: z64eocd_ExtensDs_Data: parent
block: Zip64EndOfCentralDirectoryLocator: parent
string: eocdl_Signature: parent
number: eocdl_NumOfDisk: parent
number: eocdl_RelOffsetofZ64: parent
number: eocdl_TotNumDisk: parent
block: EndOfCentralDirectoryRecord: parent
string: eocd_Signature: parent
number: eocd_NumOfDisk: parent
number: eocd_NumOfDiskWCD: parent
number: eocd_TotNumEntriesOD: parent
number: eocd_TotNumEntriesICD: parent
number: eocd_SizeOfCenDir: parent
number: eocd_OffsetToCenDir: parent
block: ZipFileCommentBlock: parent
number: eocd_CommLen: parent
blob: eocd_Comment: parent
Traceback (most recent call last):
File “C:\Peach2.3.9\\peach.py”, line 393, in
parser.asParser(args[0])
File “C:\Peach2.3.9\Peach\Analyzers\pit.py”, line 57, in asParser
return parser.parse(uri)
File “C:\Peach2.3.9\Peach\Engine\parser.py”, line 161, in parse
obj = self.HandleDocument(doc, uri)
File “C:\Peach2.3.9\Peach\Engine\parser.py”, line 351, in HandleDocument
stateMachine = self.HandleStateMachine(child, peach)
File “C:\Peach2.3.9\Peach\Engine\parser.py”, line 2888, in HandleStateMachine
state = self.HandleState(child, stateMachine)
File “C:\Peach2.3.9\Peach\Engine\parser.py”, line 2910, in HandleState
action = self.HandleAction(child, state)
File “C:\Peach2.3.9\Peach\Engine\parser.py”, line 3046, in HandleAction
action.template.setDefaults(action.data, self.dontCrack, True)
File “C:\Peach2.3.9\Peach\Engine\dom.py”, line 1304, in setDefaults
self.BuildRelationCache()
File “C:\Peach2.3.9\Peach\Engine\dom.py”, line 1518, in BuildRelationCache
ofStr = r.getOfElement().getFullnameInDataModel()
File “C:\Peach2.3.9\Peach\Engine\dom.py”, line 5133, in getOfElement
raise Exception(“Couldn’t locate [%s]” % self.of)
Exception: Couldn’t locate [LocalFileHeader]
January 22nd, 2015 on 2:53 pm
It has been a while since I’ve looked at this. Are you sure the sample you’re loading is a valid ZIP file? Based on the error, it looks like Peach can’t identify the LocalFileHeader, specifically – lfh_Signature. Also, are you running the latest development release of 2.3.9.x?
Also, if you need help it’s typically quicker to reach me on twitter at @pyoor_
February 4th, 2016 on 2:18 pm
Man this article is awesome!! Thanks for pulling this together.
Gh05t