CVE-2005-0526 in PBLang
Summary
by MITRE
Multiple cross-site scripting (XSS) vulnerabilities in PBLang 4.65 allow remote attackers to inject arbitrary web script or HTML via (1) the search string to search.php, (2) the subject of a PM, which is processed by pm.php, or (3) the body of a PM, which is processed by pmpshow.php.
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Analysis
by VulDB Data Team • 05/30/2019
The vulnerability identified as CVE-2005-0526 represents a critical cross-site scripting flaw affecting PBLang 4.65, a web-based discussion platform. This vulnerability exposes the application to remote code execution through malicious script injection, enabling attackers to compromise user sessions and potentially gain unauthorized access to sensitive information. The flaw manifests in three distinct attack vectors that collectively demonstrate the severity of the XSS vulnerability within the platform's input handling mechanisms. The vulnerability directly impacts user trust and application integrity by allowing malicious actors to exploit the platform's search functionality, private messaging system, and message display components.
The technical implementation of this vulnerability stems from inadequate input validation and output sanitization within the PBLang application's core modules. The search string parameter processed by search.php fails to properly sanitize user input before rendering it within the web page context, creating an opening for attackers to inject malicious javascript code or html elements. Similarly, the private messaging functionality in pm.php and pmpshow.php processes subject and body fields without sufficient validation, allowing attackers to craft malicious payloads that execute when other users view the compromised messages. These flaws align with CWE-79, which specifically addresses cross-site scripting vulnerabilities resulting from insufficient input sanitization and improper output encoding.
The operational impact of this vulnerability extends beyond simple script injection, as it creates persistent attack vectors that can compromise user sessions and facilitate more sophisticated attacks. An attacker could potentially redirect users to malicious websites, steal session cookies, or inject persistent malicious content that affects all users interacting with the vulnerable components. The vulnerability affects the fundamental security model of the platform by undermining the trust between users and the application. This type of vulnerability also increases the risk of credential theft, session hijacking, and potential data exfiltration from user accounts that utilize the affected messaging system.
Mitigation strategies for this vulnerability require immediate implementation of comprehensive input validation and output encoding mechanisms across all user-facing application components. The most effective approach involves implementing strict sanitization of all user input before processing and ensuring proper HTML encoding of output data to prevent script execution in browser contexts. Organizations should deploy web application firewalls to detect and block malicious input patterns, while also implementing content security policies to limit script execution capabilities. Regular security assessments and code reviews should focus on input validation mechanisms, with particular attention to areas handling user-generated content. The vulnerability also highlights the importance of following secure coding practices and implementing defense-in-depth strategies to prevent similar issues in future application development cycles, aligning with ATT&CK technique T1059 for command and script injection attacks. Additionally, regular patch management and security updates should be implemented to address known vulnerabilities and maintain the platform's security posture against evolving threats.