CVE-2018-18531 — CRITICAL (9.8)

Vulnerability 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.

CVSS Score

9.8

CRITICAL

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

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

HIGH

Integrity

HIGH

Availability

HIGH

Affected Products

Vendor	Product	Versions
Kaptcha Project	Kaptcha	2.3.2

Related Weaknesses (CWE)

CWE-330

References

https://github.com/penggle/kaptcha/issues/3Third Party Advisory
https://github.com/penggle/kaptcha/issues/3Third Party Advisory

FAQ

What is CVE-2018-18531?

CVE-2018-18531 is a vulnerability with a CVSS score of 9.8 (CRITICAL). 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 generat...

How severe is CVE-2018-18531?

CVE-2018-18531 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.

Is there a patch for CVE-2018-18531?

Check the references section above for vendor advisories and patch information. Affected products include: Kaptcha Project Kaptcha.