CVE-2019-16108 : Security Advisory and Response
Learn about CVE-2019-16108 affecting phpBB 3.2.7, allowing the insertion of CSS token sequences via BBCode, posing security risks. Find mitigation steps and best practices here.
In phpBB 3.2.7, it is possible to include a custom Cascading Style Sheets (CSS) token sequence on a webpage using BBCode.
Understanding CVE-2019-16108
In this CVE, phpBB 3.2.7 allows the addition of an arbitrary Cascading Style Sheets (CSS) token sequence to a page through BBCode.
What is CVE-2019-16108?
This vulnerability in phpBB 3.2.7 enables the insertion of a custom CSS token sequence via BBCode, potentially leading to security risks.
The Impact of CVE-2019-16108
The vulnerability allows attackers to inject malicious CSS code into web pages, which could result in various security threats such as cross-site scripting (XSS) attacks.
Technical Details of CVE-2019-16108
Vulnerability Description
- phpBB 3.2.7 permits the inclusion of a custom CSS token sequence using BBCode.
Affected Systems and Versions
- Product: phpBB 3.2.7
- Vendor: Not applicable
- Version: Not applicable
Exploitation Mechanism
- Attackers can exploit this vulnerability by crafting malicious CSS code within BBCode tags, which gets executed when rendered on a webpage.
Mitigation and Prevention
Immediate Steps to Take
- Disable the use of BBCode if not essential for website functionality.
- Regularly monitor and sanitize user-generated content to prevent the injection of malicious code.
Long-Term Security Practices
- Implement input validation mechanisms to filter out potentially harmful content.
- Educate users on safe content creation practices to minimize the risk of code injection.
Patching and Updates
- Stay updated with phpBB releases and apply patches promptly to address security vulnerabilities.