CVE-2009-4061 in Agreement module
Summary
by MITRE
Multiple cross-site scripting (XSS) vulnerabilities in the Agreement module 6.x before 6.x-1.2 for Drupal allow remote attackers to inject arbitrary web script or HTML via unspecified vectors.
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Analysis
by VulDB Data Team • 12/15/2017
The vulnerability identified as CVE-2009-4061 represents a critical cross-site scripting weakness within the Agreement module for Drupal version 6.x prior to 6.x-1.2. This security flaw resides in the module's handling of user input and data validation processes, creating an exploitable condition that enables remote attackers to execute malicious scripts within the context of affected websites. The vulnerability's classification as a persistent XSS issue means that malicious content injected through this vector can be stored on the server and subsequently served to other users, making it particularly dangerous for web applications that rely on user-generated content or administrative interfaces.
The technical implementation of this vulnerability stems from insufficient input sanitization and output encoding mechanisms within the Agreement module's codebase. Attackers can leverage this weakness by crafting malicious payloads that exploit unspecified vectors within the module's data processing pipeline. These vectors typically involve parameters or fields that are not properly validated or escaped before being rendered in web pages. The flaw aligns with CWE-79, which specifically addresses cross-site scripting vulnerabilities where untrusted data is incorporated into web pages without proper validation or encoding. The vulnerability's impact extends beyond simple script execution as it can potentially allow attackers to steal session cookies, perform unauthorized actions on behalf of users, or redirect victims to malicious websites.
Operationally, this vulnerability poses significant risks to Drupal websites utilizing the Agreement module, particularly those that handle sensitive contractual information or user agreements. The remote exploitation capability means that attackers can compromise these systems without requiring local access or authentication, making the attack surface extremely wide. The stored nature of the XSS payload allows for persistent damage, where malicious scripts can affect multiple users over time rather than just a single session. This vulnerability directly impacts the integrity and confidentiality of user data, potentially leading to account takeovers, data exfiltration, and unauthorized modifications to website content. Organizations using affected Drupal versions face potential reputational damage and regulatory compliance issues if user data is compromised through such attacks.
Mitigation strategies for CVE-2009-4061 primarily involve immediate patching of the Agreement module to version 6.x-1.2 or later, which contains the necessary security fixes. System administrators should also implement additional defensive measures such as web application firewalls that can detect and block malicious script injection attempts, input validation rules that sanitize all user-supplied data, and output encoding mechanisms that properly escape HTML characters in rendered content. The remediation process should include thorough testing of the updated module to ensure that existing functionality remains intact while addressing the XSS vulnerability. Organizations should also conduct comprehensive security assessments of their Drupal installations to identify other potentially vulnerable modules or components that may require similar updates. This vulnerability demonstrates the importance of maintaining current security patches and implementing defense-in-depth strategies that include both perimeter security controls and internal input validation mechanisms. The incident aligns with ATT&CK technique T1566, which covers the exploitation of vulnerabilities for initial access, and T1059, which addresses the execution of malicious code through web applications, highlighting the need for comprehensive security monitoring and incident response capabilities.