CVE-2004-0309 in ZoneAlarm
Summary
by MITRE
Stack-based buffer overflow in the SMTP service support in vsmon.exe in Zone Labs ZoneAlarm before 4.5.538.001, ZoneLabs Integrity client 4.0 before 4.0.146.046, and 4.5 before 4.5.085, allows remote attackers to execute arbitrary code via a long RCPT TO argument.
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Analysis
by VulDB Data Team • 12/15/2024
The vulnerability described in CVE-2004-0309 represents a critical stack-based buffer overflow affecting the SMTP service support functionality within Zone Labs ZoneAlarm security software. This flaw exists in the vsmon.exe process which handles email traffic monitoring and filtering operations. The vulnerability specifically impacts versions of ZoneAlarm before 4.5.538.001 for the main ZoneAlarm product, and versions 4.0 before 4.0.146.046 and 4.5 before 4.5.085 for the Integrity client. The buffer overflow occurs when processing the RCPT TO argument in SMTP protocol communication, which is a standard command used during email delivery to specify recipient addresses. This particular attack vector leverages the SMTP service monitoring capabilities that ZoneAlarm employs to inspect and filter email traffic for security purposes.
The technical implementation of this vulnerability stems from inadequate input validation within the vsmon.exe process when handling email recipient information. When an attacker sends an email with an excessively long RCPT TO argument, the application fails to properly bounds-check the input data before copying it into a fixed-size stack buffer. This classic stack overflow condition allows malicious data to overwrite adjacent memory locations including return addresses and control information, potentially enabling arbitrary code execution. The flaw is categorized under CWE-121 as a stack-based buffer overflow, which represents one of the most common and dangerous types of memory corruption vulnerabilities in software applications. The vulnerability is particularly concerning because it occurs within a security monitoring process that would typically be running with elevated privileges to perform network traffic inspection.
The operational impact of this vulnerability extends beyond simple remote code execution, as it creates a significant attack surface for malicious actors targeting enterprise environments where ZoneAlarm is deployed. Attackers could exploit this vulnerability to gain complete control over systems running affected versions of ZoneAlarm, potentially allowing them to install backdoors, escalate privileges, or redirect network traffic. The attack requires only a remote SMTP connection to the affected system, making it particularly dangerous in network environments where email services are accessible to external parties. This vulnerability directly aligns with ATT&CK technique T1059.007 for command and scripting interpreter, as successful exploitation would enable attackers to execute arbitrary commands on compromised systems. The security implications are severe because ZoneAlarm is designed as a perimeter security solution, and compromising its integrity would undermine the entire security posture of protected networks.
Mitigation strategies for CVE-2004-0309 focus primarily on immediate software updates to patched versions of ZoneAlarm and its Integrity client components. Organizations should prioritize deployment of ZoneAlarm versions 4.5.538.001 or later for the main product, and 4.0.146.046 or later for the Integrity client, along with 4.5.085 or later for the 4.5 series. Additionally, network administrators should implement SMTP filtering rules to limit the size of RCPT TO arguments that can be processed by email servers, creating a defensive layer that prevents exploitation attempts. System hardening measures including stack protection mechanisms and address space layout randomization should be enabled where possible to complicate exploitation attempts. Network segmentation strategies should isolate email services from critical infrastructure to limit the potential impact of successful exploitation. The vulnerability also underscores the importance of input validation and bounds checking in security applications, as highlighted in the OWASP Top 10 2021 as a critical security control that must be implemented throughout application code to prevent similar memory corruption vulnerabilities from occurring in other security products.