Edit a data value in the XML that is returned in the application’s response, to make use of the defined external entity.It can be used to get a reverse shell from the target machine. Introduce (or edit) a DOCTYPE element that defines an external entity containing the path to the file. php web reverse-shell xss code-review sql-injection ld-preload xxe file-inclusion template-injection file-uplaod Updated PHP kaotickj / The-Not-So-Simple-PHP-Command-Shell Star 10.Exploiting blind XXE to retrieve data via error messages.Exploiting blind XXE exfiltrate data out-of-band. ![]() If everything is working correctly you should get a dump of /etc/passwd From WEBSVR01 send it again to localhost. This 'shell' allows you to maintain a PTY shell through that RCE using pipes inside the victim system. ![]() I will be performing both of these attacks on a HackTheBox machine called Patents which was a really hard machine. This is a typical XXE attack against a Linux System and is a good way to prove the vulnerability exists. You might find cases where you have an RCE in a web app in a Linux machine but due to Iptables rules or other kinds of filtering you cannot get a reverse shell. Email Other Apps In this article we are going to talk about XXE injection and we will also look at LFI in a little more advanced perspective. Once I uploaded the script, I found the url for the picture/script, set up a netcat listener on my attacking machine, and then visited the page with the script and that was enough to establish a connection between the target and attacker. ![]() In some situations, an attacker can escalate an XXE attack to compromise the underlying server or other backend infrastructure, by leveraging the XXE vulnerability to perform server-side request forgery (SSRF) attacks. Let’s call some External Entities Modify send.txt to be the following. I had to rename the script from shell.php to because the site only let me upload pictures. It often allows an attacker to view files on the application server filesystem, and to interact with any backend or external systems that the application itself can access. XML external entity injection (also known as XXE) is a web security vulnerability that allows an attacker to interfere with an application’s processing of XML data.
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