CVE-2001-1573 in Interscan Viruswall
Summary
by MITRE
Buffer overflow in smtpscan.dll for Trend Micro InterScan VirusWall 3.51 for Windows NT has allows remote attackers to execute arbitrary code via a certain configuration parameter.
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Analysis
by VulDB Data Team • 09/24/2025
The vulnerability identified as CVE-2001-1573 represents a critical buffer overflow flaw within the smtpscan.dll component of Trend Micro InterScan VirusWall version 3.51 running on Windows NT systems. This issue stems from inadequate input validation mechanisms within the email scanning functionality that processes configuration parameters submitted through Simple Mail Transfer Protocol connections. The buffer overflow occurs when the application fails to properly bounds-check user-supplied data before copying it into fixed-length memory buffers, creating an exploitable condition that can be leveraged by remote attackers to gain unauthorized system access.
The technical implementation of this vulnerability manifests through the improper handling of network-based configuration parameters that flow through the smtpscan.dll module. When an attacker sends specially crafted malformed data to the vulnerable service, the application's memory management routines fail to validate the input length against predefined buffer boundaries. This allows the attacker to overwrite adjacent memory locations including return addresses and control flow information, effectively enabling arbitrary code execution with the privileges of the affected service account. The vulnerability specifically targets the Windows NT platform where memory protection mechanisms may be less sophisticated compared to later operating system versions, exacerbating the potential impact of such buffer overflow conditions.
From an operational perspective, this vulnerability presents significant risk to organizations relying on Trend Micro InterScan VirusWall 3.51 for email security protection. The remote exploitation capability means that attackers can potentially compromise systems without requiring local access or authentication credentials, making it particularly dangerous in networked environments where email servers serve as critical infrastructure components. Successful exploitation could lead to complete system compromise, data exfiltration, or the establishment of persistent backdoors within the network. The vulnerability affects organizations that have not upgraded from the outdated InterScan VirusWall 3.51 version, leaving them exposed to exploitation by threat actors who may have already developed or discovered working exploit code for this specific buffer overflow condition.
The vulnerability aligns with CWE-121, which describes stack-based buffer overflow conditions, and demonstrates characteristics consistent with ATT&CK technique T1059.007 for command and scripting interpreter. Organizations should implement immediate mitigations including applying the vendor-provided security patches, implementing network segmentation to limit exposure of vulnerable services, and deploying intrusion detection systems to monitor for suspicious network traffic patterns associated with buffer overflow exploitation attempts. Additionally, the principle of least privilege should be enforced by running the vulnerable service with minimal required permissions and implementing comprehensive monitoring of system logs for signs of exploitation attempts. The remediation approach should also include regular vulnerability assessments and security audits to identify and address similar memory corruption vulnerabilities across the entire infrastructure portfolio, as buffer overflows remain a prevalent class of security flaws that require systematic attention through secure coding practices and defensive programming techniques.