CVE-2018-18531

text/impl/DefaultTextCreator.java, text/impl/ChineseTextProducer.java, and text/impl/FiveLetterFirstNameTextCreator.java in kaptcha 2.3.2 use the Random…

published October 19, 2018

CVSS
—
EPSS
1%
Percentile
73.5
In the wild
Unconfirmed
What it is

⚠️ A sneaky use of Random instead of SecureRandom in kaptcha 2.3.2 means those CAPTCHA values are easier to crack than a piñata at a birthday party! 🎉 Think of CAPTCHA as a bouncer at a club, checking IDs to keep unwanted guests out. Using Random instead of SecureRandom is like hiring a bouncer who lets in anyone they think looks okay, making it easy for party crashers to sneak in without a proper check. This vulnerability opens the door for remote attackers to bypass access restrictions through brute-force attempts on the CAPTCHA values. Imagine someone sneaking past security by guessing the correct ID; they could gain unauthorized access to sensitive areas of your application. That's a recipe for disaster!

Put simply

Think of CAPTCHA as a bouncer at a club, checking IDs to keep unwanted guests out. Using Random instead of SecureRandom is like hiring a bouncer who lets in anyone they think looks okay, making it easy for party crashers to sneak in without a proper check. In kaptcha 2.3.2, the reliance on the Random function for generating CAPTCHA values compromises their security, as it doesn't provide the unpredictability needed to thwart brute-force attacks. This makes it much easier for attackers to predict or guess those values and get through access controls.

What to do

This vulnerability opens the door for remote attackers to bypass access restrictions through brute-force attempts on the CAPTCHA values. Imagine someone sneaking past security by guessing the correct ID; they could gain unauthorized access to sensitive areas of your application. That's a recipe for disaster! To secure your application, upgrade your kaptcha library to the latest version that uses SecureRandom for generating CAPTCHA values. Implement additional rate limiting and monitoring for any suspicious access attempts to bolster security further. You've got this! 🎯 Follow these steps, and you'll be one step closer to locking down your application! 🛡️

The record
Technical detail
CVSS
Not scored
CVSS v4.0
Not supplied
EPSS
0.01468 · 73.5th percentile
Published
2018-10-19T20:00Z
EPSS history
Timeline
  • 19 OCT 20:00Z
    text/impl/DefaultTextCreator.java, text/impl/ChineseTextProducer.java, and text/impl/FiveLetterFirstNameTextCreator.java in kaptcha 2.3.2 use the Random…
    cvelistv5