CVE-2015-4364 in Campaign Monitor Module
Summary
by MITRE
Multiple cross-site request forgery (CSRF) vulnerabilities in includes/campaignmonitor_lists.admin.inc in the Campaign Monitor module 7.x-1.0 for Drupal allow remote attackers to hijack the authentication of users for requests that (1) enable list subscriptions via a request to admin/config/services/campaignmonitor/lists/%/enable or (2) disable list subscriptions via a request to admin/config/services/campaignmonitor/lists/%/disable.
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Analysis
by VulDB Data Team • 04/07/2019
The CVE-2015-4364 vulnerability represents a critical cross-site request forgery flaw within the Campaign Monitor module for Drupal 7.x-1.0, specifically targeting the includes/campaignmonitor_lists.admin.inc file. This vulnerability exposes the system to remote attackers who can manipulate user sessions and execute unauthorized actions through carefully crafted requests. The flaw fundamentally undermines the security model of the web application by allowing attackers to perform administrative operations without proper authentication or authorization from legitimate users. The vulnerability's impact extends beyond simple data manipulation as it enables complete hijacking of user authentication contexts, making it particularly dangerous in environments where administrative privileges are involved.
The technical implementation of this CSRF vulnerability stems from the absence of proper anti-CSRF token validation within the administrative endpoints responsible for managing list subscriptions. When users navigate to the campaign monitor configuration pages, the system fails to verify that requests originate from legitimate sources within the authenticated session. The affected URLs admin/config/services/campaignmonitor/lists/%/enable and admin/config/services/campaignmonitor/lists/%/disable lack adequate token verification mechanisms, allowing attackers to construct malicious requests that appear to come from authenticated users. This flaw aligns with CWE-352, which specifically addresses cross-site request forgery vulnerabilities where the application fails to validate the authenticity of requests originating from authenticated users. The vulnerability operates at the application layer, exploiting the trust relationship between the web application and its users.
The operational impact of this vulnerability is severe and multifaceted, as it enables attackers to perform unauthorized subscription management operations on behalf of authenticated users. An attacker could potentially enable or disable list subscriptions without user consent, leading to data exposure, service disruption, or unauthorized access to marketing lists. This vulnerability particularly affects organizations relying on Campaign Monitor for email marketing automation, as it could allow malicious actors to manipulate subscriber lists, potentially leading to spam distribution or data breaches. The attack vector requires minimal technical expertise, as it leverages existing user sessions and does not require authentication credentials. This makes the vulnerability particularly dangerous in shared hosting environments or when users maintain long-lived sessions, as the attack surface expands significantly.
Mitigation strategies for this vulnerability must address both immediate remediation and long-term security enhancements. The primary solution involves implementing proper anti-CSRF token validation within the affected administrative endpoints, ensuring that each request contains a unique, unpredictable token that ties to the user's current session. Organizations should also consider implementing additional security measures such as request origin validation and session management improvements. The vulnerability demonstrates the importance of following security best practices outlined in the OWASP Top Ten, particularly the prevention of CSRF attacks through proper token implementation. Organizations should also consider implementing web application firewalls and monitoring for suspicious request patterns. The fix should include comprehensive testing to ensure that all administrative endpoints properly validate user sessions and that the token-based authentication mechanism cannot be bypassed through various attack vectors. This vulnerability serves as a reminder of the critical need for thorough security testing of third-party modules and the importance of maintaining up-to-date security patches in Drupal environments.