Use of Insufficiently Random Values in penggle:kaptcha · CVE-2018-18531 · GitHub Advisory Database · GitHub

Use of Insufficiently Random Values in penggle:kaptcha

Critical severity GitHub Reviewed Published Oct 23, 2018 to the GitHub Advisory Database • Updated Jan 9, 2023

Package

com.github.penggle:kaptcha (Maven)

Affected versions

<= 2.3.2

Patched versions

None

Description

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.

References

Published to the GitHub Advisory Database Oct 23, 2018

Reviewed Jun 16, 2020

Last updated Jan 9, 2023

Severity

Critical

9.8

/ 10

CVSS base metrics

Attack vector

Network

Attack complexity

Low

Privileges required

None

User interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H