The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applicationsUpgrade Debian:unstable rails to version 2:7.2.2.2+dfsg-1 or higher.
Note: Versions mentioned in the description apply only to the upstream rails package and not the rails package as distributed by Debian.
See How to fix? for Debian:unstable relevant fixed versions and status.
Active Storage attempts to prevent the use of potentially unsafe image transformation methods and parameters by default.
The default allowed list contains three methods allow for the circumvention of the safe defaults which enables potential command injection vulnerabilities in cases where arbitrary user supplied input is accepted as valid transformation methods or parameters.
This vulnerability impacts applications that use Active Storage with the image_processing processing gem in addition to mini_magick as the image processor.
Vulnerable code will look something similar to this:
<%= image_tag blob.variant(params[:t] => params[:v]) %>
Where the transformation method or its arguments are untrusted arbitrary input.
All users running an affected release should either upgrade or use one of the workarounds immediately.
Consuming user supplied input for image transformation methods or their parameters is unsupported behavior and should be considered dangerous.
Strict validation of user supplied methods and parameters should be performed as well as having a strong ImageMagick security policy deployed.
Thank you lio346 for reporting this!