A typical attack example would look like: zip files server side allowing the upload of a zip file using a vulnerable file function exploitation of the zip filter via an LFI to execute. Image description: An image showing the output from /etc/passwd on a UNIX / Linux system using php://filter PHP ZIP Wrapper LFI The above is an effort to display the contents of the /etc/passwd file on a UNIX / Linux based system.īelow is an example of a successful exploitation of an LFI vulnerability on a web application: Any script that includes a file from a web server is a good candidate for further LFI testing, for example:Ī security consultant would attempt to exploit this vulnerability by manipulating the file location parameter, such as: LFI vulnerabilities are typically easy to identify and exploit. The following is an example of PHP code vulnerable to local file inclusion. This vulnerability exists when a web application includes a file without correctly sanitising the input, allowing and attacker to manipulate the input and inject path traversal characters and include other files from the web server. Local File Inclusion (LFI) allows an attacker to include files on a server through the web browser. What is a Local File Inclusion (LFI) vulnerability? ![]() ![]() LFI vulnerabilities are typically discovered during application assessments or bug bounty testing using the techniques contained within this document. The intent of this document is to assist with web app security assessments engagements by consolidating research for LFI testing techniques. 3 What is a Local File Inclusion (LFI) vulnerability?.
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