CVE-2014-9468 in Instantforum
Summary
by MITRE
Multiple cross-site scripting (XSS) vulnerabilities in InstantASP InstantForum.NET 4.1.3, 4.1.2, 4.1.1, 4.0.0, 4.1.0, and 3.4.0 allow remote attackers to inject arbitrary web script or HTML via the SessionID parameter to (1) Join.aspx or (2) Logon.aspx.
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Analysis
by VulDB Data Team • 04/16/2022
The CVE-2014-9468 vulnerability represents a critical cross-site scripting flaw affecting InstantASP InstantForum.NET versions 3.4.0 through 4.1.3, with exploitation occurring through the SessionID parameter in two key authentication pages. This vulnerability falls under the CWE-79 category of Cross-Site Scripting, specifically manifesting as stored or reflected XSS depending on how the malicious payload is delivered and processed within the application's authentication flow. The affected endpoints Join.aspx and Logon.aspx serve as primary attack vectors where user-supplied SessionID parameters are not properly sanitized or validated, creating opportunities for malicious actors to inject arbitrary HTML and JavaScript code into the application's response.
The technical exploitation of this vulnerability occurs when an attacker crafts a malicious SessionID parameter containing embedded script tags and submits it to either the Join.aspx or Logon.aspx pages. The application fails to implement proper input validation or output encoding mechanisms for this parameter, allowing the malicious code to be executed within the context of other users' browsers who subsequently access the affected pages. This creates a persistent threat where authenticated users may unknowingly execute malicious scripts when their browser processes the compromised session data, potentially leading to session hijacking, credential theft, or redirection to malicious sites.
The operational impact of CVE-2014-9468 extends beyond simple script execution as it undermines the fundamental security assumptions of the forum application's authentication system. Attackers can leverage this vulnerability to establish persistent access to user accounts, monitor user activities, or manipulate forum content through the execution of malicious scripts that can modify the user interface, steal cookies, or redirect users to phishing sites. The vulnerability is particularly concerning in forum environments where users trust the application's security and may inadvertently execute malicious payloads when interacting with compromised session data. This risk is amplified by the fact that the SessionID parameter is commonly used in authentication flows, making it a prime target for attackers seeking to compromise user sessions and gain unauthorized access to sensitive forum data.
Security mitigations for this vulnerability should focus on implementing comprehensive input validation and output encoding mechanisms for all user-supplied parameters, particularly those used in authentication flows. The application should enforce strict parameter validation for SessionID values, rejecting any input containing potentially dangerous characters or script tags. Additionally, proper HTML encoding should be implemented when rendering user-supplied data in the application's response, ensuring that any malicious content is neutralized before being displayed to users. Organizations should also implement Content Security Policy headers to provide an additional layer of protection against XSS attacks, and consider implementing secure session management practices that do not rely on predictable or easily manipulable session identifiers. The vulnerability demonstrates the critical importance of input sanitization in web applications and aligns with ATT&CK technique T1059.001 for command and scripting interpreter, as attackers can execute arbitrary scripts through the vulnerable parameter handling.