File path traversal, traversal sequences blocked with absolute path bypass | Dec 12, 2022
Introduction
Welcome to my another writeup! In this Portswigger Labs lab, you’ll learn: File path traversal, traversal sequences blocked with absolute path bypass! Without further ado, let’s dive in.
- Overall difficulty for me (From 1-10 stars): ★☆☆☆☆☆☆☆☆☆
Background
This lab contains a file path traversal vulnerability in the display of product images.
The application blocks traversal sequences but treats the supplied filename as being relative to a default working directory.
To solve the lab, retrieve the contents of the /etc/passwd file.
Exploitation
Home page:
In the previous lab, we found that there is a file path traversal vulnerability in the display of product images:
This time however, the application blocks traversal sequences but treats the supplied filename as being relative to a default working directory.
To bypass this, we can just provide the absolute path of the /etc/passwd:
What we’ve learned:
- File path traversal, traversal sequences blocked with absolute path bypass