CVE-2018-18531 Explained : Impact and Mitigation
Learn about CVE-2018-18531, a vulnerability in kaptcha 2.3.2 where the use of Random instead of SecureRandom for CAPTCHA generation can enable attackers to bypass access restrictions. Find mitigation steps and long-term security practices here.
In kaptcha 2.3.2, the classes DefaultTextCreator.java, ChineseTextProducer.java, and FiveLetterFirstNameTextCreator.java use the Random function instead of SecureRandom for generating CAPTCHA values, potentially enabling malicious actors to bypass access restrictions.
Understanding CVE-2018-18531
This CVE involves a vulnerability in the kaptcha library that could be exploited by attackers to circumvent access controls through brute-force methods.
What is CVE-2018-18531?
The issue arises from the use of the Random function instead of SecureRandom in generating CAPTCHA values, making it easier for remote attackers to bypass intended access restrictions.
The Impact of CVE-2018-18531
The vulnerability increases the risk of unauthorized access to systems utilizing the kaptcha library, potentially leading to security breaches and data compromise.
Technical Details of CVE-2018-18531
The technical aspects of the vulnerability provide insights into its exploitation and affected systems.
Vulnerability Description
The classes mentioned in kaptcha 2.3.2 utilize the Random function, which lacks the necessary security measures, allowing attackers to exploit the CAPTCHA generation process.
Affected Systems and Versions
- Product: Not applicable
- Vendor: Not applicable
- Version: 2.3.2 (affected)
Exploitation Mechanism
Attackers can leverage the inadequate randomness of the Random function to launch brute-force attacks, potentially compromising access controls.
Mitigation and Prevention
Addressing CVE-2018-18531 requires immediate actions and long-term security practices.
Immediate Steps to Take
- Update the kaptcha library to a patched version that employs SecureRandom for CAPTCHA generation.
- Implement additional access controls to mitigate the risk of brute-force attacks.
Long-Term Security Practices
- Regularly monitor and audit access logs for suspicious activities.
- Conduct security assessments to identify and remediate vulnerabilities in third-party libraries.
Patching and Updates
- Stay informed about security updates and patches released by the kaptcha library maintainers.
- Apply patches promptly to ensure the security of systems utilizing the vulnerable versions.