Lhfs_1zip -

If the extraction tool doesn't sanitize filenames, you can use ../ to write files outside the intended directory (e.g., overwriting .ssh/authorized_keys or /etc/passwd ).

If you are writing the "defense" side of this write-up, the fix is to the extraction process or strictly sanitize filenames to remove any .. or leading / characters. g., PicoCTF, SECCON, or HTB) where this challenge appeared? lhfs_1zip

Most variations of this challenge focus on Path Traversal or Buffer Overflows within the extraction logic. Technical Breakdown & Solution Steps 1. File Format Analysis If the extraction tool doesn't sanitize filenames, you

Upload or pass this file to the lhfs binary. If vulnerable, it will attempt to "extract" the file to that path or read from it, often leaking the contents in the process. Common Mitigation File Format Analysis Upload or pass this file