CVE-2005-0157 in SmartList
Summary
by MITRE
The confirm add-on in SmartList 3.15 and earlier allows attackers to subscribe arbitrary e-mail addresses by using a valid cookie that specifies an address other than the address for which the cookie was assigned.
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Analysis
by VulDB Data Team • 06/06/2019
The vulnerability described in CVE-2005-0157 represents a significant security flaw within the SmartList 3.15 and earlier versions of the confirm add-on system. This issue specifically targets the email subscription mechanism that relies on cookie-based authentication to validate user addresses. The vulnerability stems from improper validation of cookie contents, allowing malicious actors to exploit the system by leveraging a valid cookie that contains a different email address than the one for which the cookie was originally issued. This creates a fundamental authentication bypass scenario where attackers can effectively impersonate legitimate users or subscribe unauthorized email addresses to lists they should not have access to.
The technical implementation of this vulnerability demonstrates a classic case of insufficient input validation and improper session management. When the confirm add-on processes subscription requests, it accepts cookies that contain email address information without properly verifying that the address within the cookie matches the intended recipient. This weakness falls under the category of insecure direct object reference vulnerabilities, where the system fails to validate the legitimacy of the referenced object. The flaw essentially allows attackers to manipulate the subscription process by simply crafting or reusing a valid cookie with an altered email address, bypassing the normal verification procedures that should ensure only legitimate users can subscribe to specific email lists.
The operational impact of this vulnerability extends beyond simple unauthorized access to email lists. Attackers could potentially use this flaw to flood legitimate users with unwanted emails, conduct spam campaigns, or gain unauthorized access to subscription-based services that rely on email verification. The vulnerability creates a persistent security risk that could be exploited repeatedly without requiring additional authentication credentials, as the valid cookie provides sufficient authority to perform subscription actions. This type of vulnerability is particularly concerning in web applications where email subscription services are commonly used for newsletters, notifications, and user engagement, as it could enable large-scale abuse of these systems.
From a cybersecurity perspective, this vulnerability aligns with several key concepts in the ATT&CK framework, particularly in the privilege escalation and persistence categories where attackers can maintain unauthorized access to systems through manipulated session tokens. The issue also relates to CWE-285, which covers improper authorization in session management, and CWE-347, addressing improper verification of cryptographic signatures. Organizations implementing similar subscription systems should consider implementing additional validation checks that verify the integrity of session tokens and ensure that address information within authentication cookies matches the intended recipient. Mitigation strategies should include implementing proper cookie validation mechanisms, adding additional authentication layers for subscription modifications, and ensuring that all address-related information in session tokens is cryptographically verified to prevent unauthorized modifications.
The vulnerability underscores the critical importance of proper session management and input validation in web applications, particularly those handling user subscriptions and email communications. Security practitioners should implement comprehensive testing procedures that include session token manipulation scenarios and address validation checks. Additionally, organizations should regularly audit their session management implementations to ensure that authentication tokens cannot be easily manipulated to gain unauthorized access to user resources. This vulnerability serves as a reminder that even seemingly simple subscription mechanisms can contain critical security flaws when proper validation and authorization checks are not implemented. The attack vector is particularly dangerous because it requires minimal credentials beyond a valid cookie, making it an attractive target for automated exploitation campaigns.