CVE-2008-3336 in PunBB
Summary
by MITRE
Multiple cross-site scripting (XSS) vulnerabilities in PunBB before 1.2.19 allow remote attackers to inject arbitrary web script or HTML via unspecified vectors in (1) include/parser.php and (2) moderate.php.
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Analysis
by VulDB Data Team • 09/30/2018
The vulnerability identified as CVE-2008-3336 represents a critical cross-site scripting flaw affecting PunBB forums version 1.2.18 and earlier. This vulnerability stems from inadequate input validation and output encoding mechanisms within the forum software's core components, specifically in the include/parser.php and moderate.php files. The issue allows remote attackers to execute malicious scripts in the context of affected users' browsers, potentially leading to unauthorized access to sensitive data or complete session hijacking. The vulnerability's classification as CWE-79 indicates a failure to properly sanitize user-supplied input before it is rendered in web pages, creating an exploitable entry point for malicious actors.
The technical exploitation of this vulnerability occurs through the manipulation of input parameters that are processed by the affected PHP scripts. In include/parser.php and moderate.php, user-provided data is not adequately filtered or escaped before being displayed in web interfaces, enabling attackers to inject malicious JavaScript code or HTML content. When unsuspecting users view pages containing this malicious content, their browsers execute the injected scripts, potentially compromising their sessions or redirecting them to malicious sites. The vulnerability's impact extends beyond simple script injection as it can be leveraged for more sophisticated attacks including credential theft, data exfiltration, and privilege escalation within the forum environment.
The operational impact of CVE-2008-3336 is significant for organizations relying on PunBB forums for communication and collaboration. Attackers can exploit this vulnerability to gain unauthorized access to user accounts, manipulate forum content, and potentially establish persistent access points within the network infrastructure. The vulnerability affects the integrity and confidentiality of the forum's data, as well as the trust relationships between users and administrators. Given that forums often contain sensitive information shared by users, successful exploitation could lead to the compromise of personal data, business secrets, or confidential communications. The vulnerability also impacts the availability of the forum service, as attackers may use the XSS flaws to redirect users to malicious sites or inject content that disrupts normal forum operations.
Organizations should implement immediate mitigations including upgrading to PunBB version 1.2.19 or later, which contains the necessary patches to address the XSS vulnerabilities. Additional defensive measures include implementing proper input validation and output encoding mechanisms, deploying web application firewalls, and conducting regular security assessments of forum components. The vulnerability aligns with ATT&CK technique T1566.001 for initial access through spearphishing attachments and T1071.001 for application layer protocol usage. Security teams should also consider implementing content security policies and monitoring for suspicious user activity patterns that may indicate exploitation attempts. Regular security training for administrators and users can help prevent successful exploitation by raising awareness of potential attack vectors and encouraging secure browsing practices.