From ba02c1bd6981675aaf5a0b6cddb7457e53d5eed1 Mon Sep 17 00:00:00 2001 From: Brett Weiland Date: Mon, 4 Jan 2021 16:32:01 -0600 Subject: new file: HeapLAB+Bible.pdf new file: HeapLAB/.glibc/glibc_2.23/ld-2.23.so new file: HeapLAB/.glibc/glibc_2.23/ld.so.2 new file: HeapLAB/.glibc/glibc_2.23/libc-2.23.so new file: HeapLAB/.glibc/glibc_2.23/libc.so.6 new file: HeapLAB/.glibc/glibc_2.23/libio/genops.c new file: HeapLAB/.glibc/glibc_2.23/malloc/malloc.c new file: HeapLAB/.glibc/glibc_2.23_unsafe-unlink/ld-2.23.so new file: HeapLAB/.glibc/glibc_2.23_unsafe-unlink/ld.so.2 new file: HeapLAB/.glibc/glibc_2.23_unsafe-unlink/libc-2.23.so new file: HeapLAB/.glibc/glibc_2.23_unsafe-unlink/libc.so.6 new file: HeapLAB/.glibc/glibc_2.23_unsafe-unlink/libio/genops.c new file: HeapLAB/.glibc/glibc_2.23_unsafe-unlink/malloc/malloc.c new file: HeapLAB/.glibc/glibc_2.24/ld-2.24.so new file: HeapLAB/.glibc/glibc_2.24/ld.so.2 new file: HeapLAB/.glibc/glibc_2.24/libc-2.24.so new file: 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HeapLAB/house_of_orange/house_of_orange new file: HeapLAB/house_of_orange/pwntools_template.py new file: HeapLAB/malloc_testbed/.links/ld.so.2 new file: HeapLAB/malloc_testbed/.links/libc.so.6 new file: HeapLAB/malloc_testbed/change_glibc_version.py new file: HeapLAB/malloc_testbed/malloc_testbed new file: HeapLAB/malloc_testbed/pwntools_template.py new file: HeapLAB/safe_unlink/pwntools_template.py new file: HeapLAB/safe_unlink/safe_unlink new file: HeapLAB/unsafe_unlink/demo new file: HeapLAB/unsafe_unlink/pwntools_template.py new file: HeapLAB/unsafe_unlink/unsafe_unlink new file: original.gz --- HeapLAB/challenge-one_byte/pwntools_template.py | 80 +++++++++++++++++++++++++ 1 file changed, 80 insertions(+) create mode 100755 HeapLAB/challenge-one_byte/pwntools_template.py (limited to 'HeapLAB/challenge-one_byte/pwntools_template.py') diff --git a/HeapLAB/challenge-one_byte/pwntools_template.py b/HeapLAB/challenge-one_byte/pwntools_template.py new file mode 100755 index 0000000..d49da15 --- /dev/null +++ b/HeapLAB/challenge-one_byte/pwntools_template.py @@ -0,0 +1,80 @@ +#!/usr/bin/python3 +from pwn import * + +elf = context.binary = ELF("one_byte") +libc = elf.libc + +gs = ''' +continue +''' +def start(): + if args.GDB: + return gdb.debug(elf.path, gdbscript=gs) + else: + return process(elf.path) + +# Index of allocated chunks. +index = 0 + +# Select the "malloc" option. +# Returns chunk index. +def malloc(): + global index + io.sendthen("> ", "1") + index += 1 + return index - 1 + +# Select the "free" option; send index. +def free(index): + io.send("2") + io.sendafter("index: ", f"{index}") + io.recvuntil("> ") + +# Select the "edit" option; send index & data. +def edit(index, data): + io.send("3") + io.sendafter("index: ", f"{index}") + io.sendafter("data: ", data) + io.recvuntil("> ") + +# Select the "read" option; read 0x58 bytes. +def read(index): + io.send("4") + io.sendafter("index: ", f"{index}") + r = io.recv(0x58) + io.recvuntil("> ") + return r + +io = start() +io.recvuntil("> ") +io.timeout = 0.1 + +# ============================================================================= + +# =-=-=- EXAMPLE -=-=-= + +# Request a chunk. +chunk_A = malloc() + +# Edit chunk A. +edit(chunk_A, b"Y"*32) + +# Read data from chunk A. +data = read(chunk_A) +log.info(f"Read from chunk_A:\n{data}") + +# Free chunk A. +free(chunk_A) + +# Because you haven't leaked a libc address yet, libc.sym. +# will only print a symbol's offset, rather than its actual address. +log.info(f"offset of puts() from start of GLIBC shared object: 0x{libc.sym.puts:02x}") + +# Once you've leaked an address, e.g. the printf() function, use: +# libc.sym.address = - libc.sym.printf +# to correctly set your libc base address to its runtime address. Now future calls +# to libc.sym will use the symbol's actual address rather than its offset. + +# ============================================================================= + +io.interactive() -- cgit v1.2.3