$self->Warn("Processing $type-like data after unknown $skip-byte header") $raf->Seek($pos + $skip, 0) or $seekErr = 1, last # last ditch effort to scan past unknown header for JPEG/TIFF When they don't appear at the start of the file. So we have to trick `exiftool` into loading the DjVu module even though theĪt first this seemed impossible, but it turns out exiftool has a special caseįor `JPEG` files, which can be abused to make exiftool parse magic bytes even # convert C escape sequences (allowed in quoted text) Through the exiftool's source code (perl ?) before we got RCE to work.įirst of all, the vulnerability is only in the DjVu module: Of course we also had to spend around 3 hours trying a bunch of stupid stuff and reading Ran `exiftool image.pdf`, and it gave me a reverse shell. Intercept the flag which gets posted to the PrivateBin every 15 seconds RUN wget & tar -xzf Image-ExifTool-12.23.tar.gz & rm Image-ExifTool-12.23.tar.gz &\Ĭd Image-ExifTool-12.23 & perl Makefile.PL & make test & make install & mkdir /uploads & chmod 777 /uploadsĮxiftool that led to RCE, and this challenge used version 12.23, which isĢ. The `/exif` page lets you upload a PDF, checks that the file starts with `%PDF-`, then runs:Įcho shell_exec('timeout 10s exiftool '. There are only two files in the zip: a `Dockerfile` and `html/exif/index.php`. > PS2: The bad guys send the file every 15 seconds.įiles: (ruthless_) \ > PS: The servers are rebooted every N minutes \ Could you intercept one of these files to me? Please, help me! The bad guys are using this server to send secret evil files.
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