CVE-2020-25124 in vBulletin
Summary
by MITRE
The Admin CP in vBulletin 5.6.3 allows XSS via an admincp/attachment.php&do=rebuild&type= URI.
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Analysis
by VulDB Data Team • 09/04/2020
The vulnerability identified as CVE-2020-25124 represents a cross-site scripting flaw within the administrative control panel of vBulletin version 5.6.3. This issue specifically manifests in the admincp/attachment.php page where the parameter 'do' and 'type' are processed without adequate input validation or output encoding. The flaw occurs when an attacker can manipulate these URI parameters to inject malicious script code that executes in the context of an authenticated administrator's browser session.
This vulnerability falls under the CWE-79 category of Cross-Site Scripting, which is classified as a critical security weakness in web applications. The specific implementation flaw allows for reflected XSS attacks where malicious payloads are injected through the URL parameters and executed when the administrator navigates to the affected page. The attack vector is particularly dangerous because it targets the administrative interface, which typically has elevated privileges and access to sensitive system functions.
The operational impact of this vulnerability is severe as it provides attackers with the ability to escalate privileges and gain unauthorized access to the administrative control panel. An attacker could potentially execute malicious scripts that steal session cookies, redirect administrators to phishing sites, or modify critical system configurations. The vulnerability is particularly concerning because vBulletin is widely used for community forums and enterprise collaboration platforms where administrators have extensive control over user data, content management, and system configurations.
The attack scenario involves an attacker crafting a malicious URI with specially formatted parameters and sending it to an administrator via social engineering or by exploiting other vulnerabilities. When the administrator clicks the link and the page loads, the malicious JavaScript code executes in their browser context, potentially leading to full administrative compromise. This vulnerability demonstrates a critical failure in input sanitization and output encoding practices within the vBulletin application's administrative components.
Mitigation strategies should include immediate patching of the vBulletin software to version 5.6.4 or later, which contains the necessary fixes for this vulnerability. Organizations should also implement proper input validation and output encoding mechanisms for all user-supplied data in administrative interfaces. Network-level protections such as web application firewalls can provide additional defense-in-depth measures. Regular security audits and penetration testing should be conducted to identify similar vulnerabilities in other components of the application. The vulnerability highlights the importance of following secure coding practices and maintaining up-to-date security patches as outlined in the mitre attack framework where such vulnerabilities are categorized under initial access and privilege escalation techniques.