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Test your applicationsLearn about Improper minification of non-boolean comparisons vulnerabilities in an interactive lesson.
Start learningUpgrade uglifier
to version 2.7.2 or higher.
uglifier
is a gem that minifies and compresses JavaScript files.
Affected versions of this package are vulnerable to Improper minification of non-boolean comparisons. It slightly alters the functionality of a JavaScript file after the minification process. This bug was demonstrated to allow potentially malicious code to be hidden within secure code, and activated by the minification process. "Backdooring your JavaScript using minifier bugs" explains how this works.