Topfile.tj 📍

| Service | Best For | Security | Speed (Tajikistan) | |--------|----------|----------|--------------------| | Topfile.tj | Local sharing | Low (user beware) | Fast | | Google Drive | Secure, long-term storage | High | Moderate | | MediaFire | General sharing | Medium | Slow | | Telegram (Saved Messages) | Quick, private transfers | Medium | Fast |

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1. Investigating the URL Parameter If the site has a URL structure like: https://website.tjctf.org/?file=hello.txt or https://website.tjctf.org/?page=about

The server script (likely PHP, Python, or Node) is taking the file parameter and looking for a file with that name.

2. Attempting Traversal Standard Directory Traversal payloads involve using ../ (or ..\\ on Windows) to move up one directory level.

We want to access the "top" file. In CTF context, "top" usually implies the root directory /, or specifically the file /flag.txt, /flag, or /home/flag.txt. topfile.tj

First, let's try to traverse up to the root. We don't know how deep the current directory is, so we use a large number of ../ sequences.

Payload: ../../../../../etc/passwd

If the URL becomes: https://website.tjctf.org/?file=../../../../../etc/passwd

And we see the contents of /etc/passwd (a standard test file for Linux servers), we know the traversal works.

3. Finding the Flag The challenge name "Top File" suggests looking in the top-level directory (root). Common locations for flags in TJCTF web challenges include: | Service | Best For | Security |

Let's try the most common location: the root directory.

Payload: ../../../../../flag.txt

(Alternatively, if the application appends .txt automatically, you might just need ../../../../../flag).

4. The Working Exploit If the server structure was something like /var/www/html/files/, adding 4 sets of ../ would bring us to /.

URL: https://website.tjctf.org/?file=....//....//....//....//flag.txt Let's try the most common location: the root directory

(Note: Sometimes filters block ../, requiring variations like ....// or URL encoding %2e%2e%2f).

However, in the original TJCTF Top File challenge, the intended solution was often simpler. The "top" hint referred to the root directory /.

Successful Request: ?file=../../../flag.txt

Upon visiting this URL, the server reads the file located at /flag.txt and displays it in the browser.

Legitimate uses include:

However, like many anonymous file hosts worldwide (Rapidgator, Turbobit, etc.), Topfile.tj is also widely used to share copyrighted content—movies, music albums, cracked software, and e-books. This is where caution is needed.