CVE-2004-2587 in SmarterMail
Summary
by MITRE
login.aspx in SmarterTools SmarterMail 1.6.1511 and 1.6.1529 allows remote attackers to cause a denial of service via a long txtusername parameter, possibly due to a buffer overflow.
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Analysis
by VulDB Data Team • 06/30/2018
The vulnerability identified as CVE-2004-2587 affects SmarterTools SmarterMail version 1.6.1511 and 1.6.1529, specifically targeting the login.aspx web page component. This issue represents a classic buffer overflow vulnerability that occurs when the application fails to properly validate input length before processing user-supplied data. The flaw manifests when an attacker submits an excessively long txtusername parameter through the login form, causing the application to attempt to store this data in a fixed-size buffer that cannot accommodate the excessive input length. The vulnerability falls under the category of improper input validation and buffer handling, which are fundamental security weaknesses that have been extensively documented in various security frameworks and standards.
The technical implementation of this vulnerability demonstrates a clear lack of input sanitization and boundary checking within the application's authentication mechanism. When the login.aspx page processes the txtusername parameter, it likely uses a fixed-length character array or buffer to store the username value without performing adequate length validation or bounds checking. This allows an attacker to exceed the allocated buffer space, potentially causing memory corruption that results in application instability or complete service termination. The vulnerability operates at the application layer and can be exploited remotely without requiring authentication, making it particularly dangerous as it can be leveraged by anyone with access to the target system's network. This type of flaw directly relates to CWE-121, which describes stack-based buffer overflow conditions, and CWE-122, which covers heap-based buffer overflow scenarios that can occur during dynamic memory allocation.
The operational impact of this vulnerability extends beyond simple denial of service, as it can potentially be leveraged as a stepping stone for more sophisticated attacks. When the application crashes or becomes unresponsive due to buffer overflow conditions, legitimate users are denied access to the email services, creating a significant disruption to business operations. Organizations relying on SmarterMail for their email infrastructure face potential downtime that could affect communication and productivity across their user base. The vulnerability's remote exploitability means that attackers can target the service from anywhere on the network, making it particularly attractive for malicious actors seeking to disrupt services or create opportunities for additional attacks. From an attacker perspective, this vulnerability aligns with techniques described in the ATT&CK framework under the T1499 category, which covers network denial of service attacks. The ability to cause a denial of service through input manipulation represents a fundamental weakness that can be exploited for various malicious purposes, including service disruption, data availability attacks, and potentially as a precursor to more complex exploitation attempts.
The recommended mitigation strategies for this vulnerability include immediate application patching from the vendor, as the issue affects specific versions of SmarterMail that are no longer supported. Organizations should implement input validation measures at the application level, including length restrictions on username parameters and proper buffer management practices. Network-level protections such as web application firewalls can provide additional defense-in-depth measures to detect and block malicious input patterns. The vulnerability highlights the importance of proper input validation and buffer handling in web applications, emphasizing the need for developers to follow secure coding practices that prevent buffer overflow conditions. Security teams should also implement monitoring for unusual login attempts and service disruptions that may indicate exploitation attempts. Given that this vulnerability affects legacy software versions, organizations should plan for migration to supported and more secure versions of the email platform to prevent similar issues from occurring in the future. The remediation process should include thorough testing to ensure that the patch or mitigation does not introduce compatibility issues with existing email services and user workflows.