CVE-2003-0929 in MAILsweeper
Summary
by MITRE
Clearswift MAILsweeper before 4.3.15 does not properly detect and filter ZIP 6.0 encoded files, which allows remote attackers to bypass intended policy.
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Analysis
by VulDB Data Team • 07/03/2024
The vulnerability identified as CVE-2003-0929 affects Clearswift MAILsweeper versions prior to 4.3.15, representing a critical flaw in email security filtering mechanisms. This issue stems from insufficient detection capabilities within the email gateway's content filtering system, specifically concerning ZIP 6.0 encoded files that are commonly used for file compression and packaging. The vulnerability exists in the software's ability to properly identify and quarantine malicious content that has been obfuscated through ZIP 6.0 compression techniques, creating a significant security gap in email protection protocols.
The technical flaw manifests in the software's decompression and analysis algorithms that fail to properly handle or recognize ZIP 6.0 encoded files during the email scanning process. When an attacker sends an email containing malicious content packaged in a ZIP 6.0 archive, the MAILsweeper system does not adequately inspect the compressed content, allowing potentially harmful files to bypass security policies. This weakness specifically impacts the software's ability to perform deep content inspection and can be categorized under CWE-20, which addresses improper input validation, and CWE-502, which deals with deserialization of untrusted data. The vulnerability operates at the intersection of archive handling and content filtering, creating a path for attackers to exploit the system's failure to properly decompress and analyze compressed content.
The operational impact of this vulnerability extends beyond simple bypass of security measures, as it enables attackers to circumvent email security policies designed to prevent the delivery of malicious content. Remote attackers can leverage this weakness to deliver phishing emails, malware payloads, or other harmful content that would otherwise be blocked by the security system. This creates a persistent threat vector that can affect organizations relying on MAILsweeper for email protection, potentially leading to data breaches, system compromises, or other security incidents. The vulnerability's remote exploitability means that attackers do not require physical access to the system, making it particularly dangerous in networked environments where email traffic flows continuously.
Organizations utilizing Clearswift MAILsweeper versions prior to 4.3.15 should immediately implement mitigation strategies including mandatory software updates to the patched version, enhanced monitoring of email traffic for suspicious compressed content, and implementation of additional security layers such as sandboxing for suspicious attachments. The ATT&CK framework categorizes this vulnerability under T1190, which addresses exploit public-facing application, and T1078, which deals with valid accounts, as attackers may use this weakness to deliver payloads through legitimate email channels. Security administrators should also consider implementing network-based intrusion detection systems to monitor for unusual patterns of compressed file transfers and establish comprehensive incident response procedures to address potential exploitation attempts. The vulnerability highlights the importance of proper decompression and content analysis in email security systems, emphasizing the need for robust input validation and comprehensive security testing of content filtering mechanisms.