CVE-2003-1154 in MAILsweeper
Summary
by MITRE
MAILsweeper for SMTP 4.3 allows remote attackers to bypass virus protection via a mail message with a malformed zip attachment, as exploited by certain MIMAIL virus variants.
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Analysis
by VulDB Data Team • 06/16/2018
The vulnerability described in CVE-2003-1154 represents a critical security flaw in MAILsweeper for SMTP version 4.3 that directly undermines the software's core antivirus protection capabilities. This vulnerability specifically targets the mail filtering system's ability to properly scan and identify malicious content within email attachments, creating a significant attack vector for threat actors seeking to circumvent security controls. The flaw manifests when the system encounters mail messages containing malformed zip attachments that exploit parsing inconsistencies in the antivirus scanning engine.
The technical implementation of this vulnerability stems from insufficient input validation and sanitization within the MAILsweeper SMTP filtering software. When processing email messages with malformed zip attachments, the system fails to properly interpret or reject these suspicious file structures, allowing malicious code to bypass the antivirus detection mechanisms entirely. This represents a classic case of improper handling of structured data input where the software does not adequately validate the integrity and format of archive files before processing them for potential threats. The vulnerability specifically affects the MIME attachment parsing functionality, where the system's zip file decompression and scanning logic contains a parsing flaw that permits malicious code execution.
The operational impact of this vulnerability extends beyond simple bypass of antivirus protection, as it enables the successful delivery of malware to target systems through email channels that should have been blocked by security controls. Attackers exploiting this vulnerability can leverage the MIMAIL virus variants to spread malicious code across networks, potentially leading to complete system compromise, data exfiltration, and unauthorized access to sensitive information. The implications are particularly severe for organizations relying on MAILsweeper as their primary email security solution, as this vulnerability effectively nullifies the protection provided by the software. From an attack perspective, this vulnerability aligns with the ATT&CK technique T1192 - Spearphishing Attachment, where attackers use malicious attachments to deliver payloads, and demonstrates the importance of proper input validation in security software. The vulnerability also relates to CWE-20, which describes improper input validation, and CWE-457, which covers use of uninitialized variables, as the system fails to properly validate the zip file structures before processing them.
Organizations affected by this vulnerability should implement immediate mitigations including updating to patched versions of MAILsweeper for SMTP, implementing additional email security layers such as secondary antivirus scanning, and configuring more restrictive email attachment policies. Network administrators should also consider implementing email content filtering rules that specifically target known malicious zip file patterns and ensure that all email security solutions maintain proper input validation mechanisms. The vulnerability highlights the critical importance of robust input validation in security software and demonstrates how seemingly minor parsing flaws can have major security implications. Regular security assessments of email filtering systems should include testing for similar input validation vulnerabilities, and organizations should maintain comprehensive email security policies that do not rely solely on any single protection mechanism. This vulnerability serves as a reminder of the necessity for defense in depth strategies and the importance of validating all input data regardless of its source or expected format.