Insecure Random Number Generation in CAPTCHA Generation

CVE-2018-18531 · MEDIUM Severity

AV:N/AC:L/AU:N/C:P/I:N/A:N

text/impl/DefaultTextCreator.java, text/impl/ChineseTextProducer.java, and text/impl/FiveLetterFirstNameTextCreator.java in kaptcha 2.3.2 use the Random (rather than SecureRandom) function for generating CAPTCHA values, which makes it easier for remote attackers to bypass intended access restrictions via a brute-force approach.

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