CVE-2006-0002 in Exchange
Summary
by MITRE
Unspecified vulnerability in Microsoft Outlook 2000 through 2003, Exchange 5.0 Server SP2 and 5.5 SP4, Exchange 2000 SP3, and Office allows remote attackers to execute arbitrary code via an e-mail message with a crafted Transport Neutral Encapsulation Format (TNEF) MIME attachment, related to message length validation.
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Analysis
by VulDB Data Team • 06/25/2025
This vulnerability resides within Microsoft messaging products spanning multiple versions including Outlook 2000 through 2003 and various Exchange server implementations. The flaw manifests in the processing of TNEF MIME attachments which are commonly used to preserve rich text formatting and embedded objects within email messages. The vulnerability specifically relates to inadequate validation of message length parameters during the parsing of these specialized attachments, creating a potential buffer over-read condition that could be exploited by remote attackers.
The technical implementation of this vulnerability stems from insufficient input validation mechanisms within the email processing pipeline. When Microsoft Outlook or Exchange servers encounter TNEF attachments, they parse the encapsulated data structures without proper bounds checking on the message length fields. This allows an attacker to craft malicious email messages where the TNEF attachment contains malformed length indicators that exceed expected buffer sizes. The vulnerability falls under CWE-129 Input Validation and CWE-121 Stack-based Buffer Overflow categories, representing a classic case where insufficient validation leads to memory corruption.
The operational impact of this vulnerability extends beyond simple remote code execution capabilities to encompass potential system compromise and data exfiltration scenarios. Attackers can leverage this flaw to execute arbitrary code on vulnerable systems with the privileges of the affected service account, typically resulting in complete system compromise. The vulnerability affects organizations using legacy messaging infrastructure, making it particularly dangerous in enterprise environments where older Exchange versions remain operational. According to ATT&CK framework, this vulnerability maps to T1190 Exploit Public-Facing Application and T1059 Command and Scripting Interpreter, representing both initial access and execution phases of an attack lifecycle.
Mitigation strategies should focus on immediate patch deployment for all affected Microsoft products, as well as implementing network-based restrictions on TNEF attachments. Organizations should consider disabling TNEF processing entirely when possible, implementing email filtering rules that block suspicious attachment types, and establishing monitoring for unusual email processing patterns. The vulnerability highlights the importance of proper input validation and buffer management in messaging systems, with recommendations aligning with industry standards such as the OWASP Top Ten and NIST guidelines for secure coding practices. Network segmentation and privileged access controls should also be implemented to limit the potential damage from successful exploitation attempts.