CVE-2005-1832 in MyBB
Summary
by MITRE
Multiple cross-site scripting (XSS) vulnerabilities in MyBulletinBoard (MyBB) 1.00 RC4 and earlier allow remote attackers to execute arbitrary web script or HTML via the (1) forums, (2) version, or (3) limit parameter to misc.php, (4) page or (5) datecut parameter to forumdisplay.php, (6) username, (7) email, or (8) email2 parameter to member.php, (9) page or (10) usersearch parameter to memberlist.php, (11) pid or (12) tid parameter to showthread.php, or (13) tid parameter to printthread.php.
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Analysis
by VulDB Data Team • 04/30/2019
The vulnerability described in CVE-2005-1832 represents a critical cross-site scripting flaw affecting MyBulletinBoard version 1.00 RC4 and earlier. This vulnerability manifests across multiple script files within the bulletin board system, creating numerous entry points for malicious actors to inject arbitrary web scripts or HTML content into user sessions. The flaw stems from inadequate input validation and output encoding mechanisms that fail to properly sanitize user-supplied data before incorporating it into dynamic web page content. The affected parameters span across several core functionality modules including forum navigation, user management, member listings, and thread viewing components, demonstrating a widespread failure in the application's security controls. This type of vulnerability falls under CWE-79 which specifically addresses cross-site scripting flaws in software applications, making it a fundamental weakness in web application security that has been consistently identified as one of the most prevalent threats in web environments.
The operational impact of this vulnerability extends beyond simple data corruption or display manipulation, as it provides attackers with the capability to execute malicious code within the context of legitimate user sessions. When users navigate to pages containing maliciously crafted parameters, their browsers execute the injected scripts, potentially leading to session hijacking, credential theft, or redirection to malicious sites. The vulnerability affects multiple parameters across different PHP scripts including misc.php, forumdisplay.php, member.php, memberlist.php, showthread.php, and printthread.php, creating a broad attack surface that significantly increases the probability of successful exploitation. Attackers can leverage these entry points to create persistent malicious content that affects all users who view the compromised pages, making this vulnerability particularly dangerous in community-driven platforms where user-generated content is prevalent. The vulnerability's classification aligns with ATT&CK technique T1566 which covers the exploitation of web application vulnerabilities to gain unauthorized access or execute malicious code.
Mitigation strategies for this vulnerability require immediate implementation of comprehensive input validation and output encoding measures across all affected scripts. The most effective approach involves sanitizing all user-supplied input parameters before they are processed or displayed, implementing proper HTML entity encoding for dynamic content, and establishing a robust content security policy to prevent unauthorized script execution. System administrators should prioritize upgrading to patched versions of MyBulletinBoard as soon as possible, as version 1.00 RC4 and earlier contain this critical flaw. Additionally, implementing web application firewalls and security monitoring systems can help detect and block malicious parameter injection attempts. The vulnerability demonstrates the critical importance of input validation in web applications, as the flaw could have been prevented through proper sanitization of all parameters before they are incorporated into dynamic web content, aligning with security best practices established in OWASP Top Ten and other industry standards for web application security. Organizations should conduct thorough security assessments of their web applications to identify similar vulnerabilities in other components that may have been overlooked.