Our Vigilance Vulnerability Alerts team determined that the severity of this computer weakness announce is medium. This cybersecurity note impacts software or systems such as Fedora, ImageMagick, openSUSE Leap, SLES. Vulnerable systems: Fedora, ImageMagick, openSUSE Leap, SLES. Please refer to for exact version changes of the underlying ImageMagick library.Vulnerability of ImageMagick: code execution via Video Options Command Injection Synthesis of the vulnerabilityĪn attacker can use a vulnerability of ImageMagick, via Video Options Command Injection, in order to run code. There is an online editor here: Contributions are more than welcome. If you do want to use OpenMP in ImageMagick when it's called through Imagick, you should test thoroughly that it behaves correctly on your server.ĭocumentation needs a lot of work. This file is possibly located at /etc/ImageMagick-6/policy.xml or similar location. This can be accomplished by the following code: In the extremely unlikely event that a hacker is able to pipe arbitrary files to the output of Imagick, checking that it is an image file, and not the source code of your application that is being sent, is a sensible precaution. This an be be done with finfo_file() - see below.Ĭheck the result of the image processing is a valid image file before displaying it to the user. Verify that all image files begin with the expected "magic bytes" corresponding to the image file types you support before sending them to ImageMagick for processing. As much as possible the files and system resources accessible to the PHP script that Imagick is being called from should be locked down. It is better to either use it as a background task using something like SupervisorD or to run it in a separate server that is not directly accessible on the internet.ĭoing this will make it more difficult for hackers to exploit a bug, if one should exist in the libraries that ImageMagick is using.
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