CVE-2008-1485 in PunBB
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in PunBB 1.2.16 and earlier allows remote attackers to inject arbitrary web script or HTML via the get_host parameter to moderate.php.
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Analysis
by VulDB Data Team • 09/20/2018
The CVE-2008-1485 vulnerability represents a critical cross-site scripting flaw discovered in PunBB version 1.2.16 and earlier, demonstrating a fundamental weakness in input validation and output sanitization within web applications. This vulnerability specifically affects the moderate.php script which processes user input through the get_host parameter, creating an attack vector that enables malicious actors to execute arbitrary web scripts or HTML code within the context of other users' browsers. The vulnerability stems from insufficient validation of user-supplied data, allowing attackers to inject malicious payloads that persist in the application's response, thereby compromising user sessions and potentially leading to unauthorized access or data theft.
The technical implementation of this vulnerability aligns with CWE-79, which specifically addresses cross-site scripting flaws in web applications. The flaw occurs when the application fails to properly escape or sanitize user input before incorporating it into dynamic web content, creating an environment where attacker-controlled data can be executed as script code. In the context of PunBB's moderate.php script, the get_host parameter serves as the injection point where malicious input can be passed through HTTP requests, bypassing normal security controls and allowing the execution of arbitrary code within the victim's browser context. This particular vulnerability falls under the category of reflected XSS attacks, where the malicious payload is reflected back to the user through the application's response rather than being stored in a database.
The operational impact of this vulnerability extends beyond simple script injection, potentially enabling attackers to perform session hijacking, deface the forum, steal sensitive user information, or redirect victims to malicious websites. When exploited, the vulnerability allows remote attackers to manipulate forum content, compromise user credentials, or gain unauthorized administrative privileges within the PunBB environment. The attack requires minimal technical expertise and can be executed through simple HTTP requests, making it particularly dangerous for widely deployed forum applications. Organizations running affected versions of PunBB face significant risks to their users' security and data integrity, as the vulnerability can be exploited by anyone with access to the forum's moderation interface.
Mitigation strategies for CVE-2008-1485 should prioritize immediate patching of affected PunBB installations to version 1.2.17 or later, which includes proper input validation and output sanitization mechanisms. System administrators should implement comprehensive input filtering that removes or escapes potentially dangerous characters from user-supplied data, particularly focusing on the get_host parameter in moderate.php. The implementation of Content Security Policy (CSP) headers can provide additional protection layers by restricting the sources from which scripts can be executed within the browser context. Additionally, regular security audits and penetration testing should be conducted to identify similar vulnerabilities in other web applications, while implementing proper logging and monitoring to detect potential exploitation attempts. Organizations should also consider implementing web application firewalls to provide an additional barrier against XSS attacks, and ensure that all users are educated about the risks of clicking on suspicious links or providing personal information on compromised forums. The vulnerability serves as a reminder of the critical importance of secure coding practices and regular security updates in maintaining web application integrity.