CVE-2012-5099 in PHPB2B
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in list.php in PHPB2B 4.1 and earlier allows remote attackers to inject arbitrary web script or HTML via the q parameter in a search action.
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Analysis
by VulDB Data Team • 03/09/2025
The CVE-2012-5099 vulnerability represents a classic cross-site scripting flaw in the PHPB2B 4.1 content management system that exposes users to significant security risks through improper input validation. This vulnerability specifically affects the list.php script which handles search functionality, making it a critical vector for malicious actors to exploit. The flaw manifests when the application fails to properly sanitize user input submitted through the q parameter during search operations, allowing attackers to inject arbitrary web scripts or HTML code directly into the application's response.
The technical implementation of this vulnerability stems from the application's insufficient sanitization of user-supplied data before rendering it in web pages. When users perform searches through the q parameter, the PHPB2B application processes this input without adequate validation or encoding mechanisms, creating an opening for malicious code injection. Attackers can leverage this weakness by crafting specially designed search queries containing script tags or other malicious HTML elements that get executed in the browsers of unsuspecting users who view the search results. This type of vulnerability falls under CWE-79 which specifically addresses cross-site scripting flaws in web applications, and aligns with ATT&CK technique T1190 for exploitation of web application vulnerabilities.
The operational impact of this vulnerability extends beyond simple script execution, as it enables attackers to perform various malicious activities including session hijacking, credential theft, and redirection to malicious websites. An attacker could craft payloads that steal session cookies from authenticated users, potentially gaining unauthorized access to administrative accounts or user data. The vulnerability also allows for defacement of the affected website, data exfiltration, and can serve as a stepping stone for further attacks within the network. Given that PHPB2B was a widely used platform for business directories and classified ads, the potential impact on user privacy and business operations was substantial, particularly for organizations relying on the platform for critical business functions.
Mitigation strategies for CVE-2012-5099 should prioritize immediate patching of the affected PHPB2B versions, as the vulnerability existed in releases up to 4.1. Organizations should implement proper input validation and output encoding mechanisms to prevent user-supplied data from being executed as code. The implementation of Content Security Policy headers can provide additional defense-in-depth measures, while regular security audits and penetration testing should be conducted to identify similar vulnerabilities. Additionally, developers should adopt secure coding practices such as parameterized queries and proper HTML escaping when handling user input to prevent similar issues in future applications. The vulnerability serves as a reminder of the critical importance of input validation in web applications and the potential consequences of inadequate sanitization of user-supplied data in search and form processing functions.