2 files changed, 80 insertions, 0 deletions
diff --git a/HeapLAB/challenge-one_byte/one_byte b/HeapLAB/challenge-one_byte/one_byte
new file mode 100755
index 0000000..696030a
--- /dev/null
+++ b/HeapLAB/challenge-one_byte/one_byte
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.<symbol name>
+# 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 = <leaked printf 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()