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CVE-2018-18531

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Date: October 3, 2022

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.

Language: Java

Severity Score

Related Resources (3)

https://github.com/penggle/kaptcha/issues/3
https://nvd.nist.gov/vuln/detail/CVE-2018-18531
https://www.mend.io/vulnerability-database/CVE-2018-18531

Severity Score

Weakness Type (CWE)

Use of Insufficiently Random Values

CWE-330

CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): HIGH
Availability (A): HIGH

CVSS v2

Base Score:
Access Vector (AV): NETWORK
Access Complexity (AC): LOW
Authentication (AU): NONE
Confidentiality (C): PARTIAL
Integrity (I): NONE
Availability (A): NONE
Additional information:

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