Collected research

Passing Malicious PHP Through getimagesize()

ha.ckers.org web application security lab - Archive » Passing Malicious PHP Through getimagesize()

Michael Schramm's finding, relayed by RSnake: PHP can be embedded in an 8x8 GIF that still passes getimagesize(). Inserting /* before the header's illegal bytes makes PHP skip them, so the file validates as an image and executes phpinfo() when requested. Breaks upload filters that trust getimagesize() and keep the original filename.

Record

Document

ha.ckers.org web application security lab - Archive » Passing Malicious PHP Through getimagesize()

Published by

ha.ckers.org

Topic

Server

In the archive

• Collected in the 2007 research round

Tags

• php
• file-upload
• rce
• filter-bypass
• mime
• owasp-a05-2021

This page is the archive's own catalogue record. The research is the work of ha.ckers.org, first published at the original source. Preserved copies are kept so the citation survives its host; this one was last captured on 9 August 2026.