CVE-2004-0503 in Outlook
Summary
by MITRE
Microsoft Outlook 2003 allows remote attackers to bypass the default zone restrictions and execute script within media files via a Rich Text Format (RTF) message containing an OLE object for the Windows Media Player, which bypasses Media Player s setting to disallow scripting and may lead to unprompted installation of an executable when exploited in conjunction with predictable-file-location exposures such as CVE-2004-0502.
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Analysis
by VulDB Data Team • 06/07/2017
This vulnerability represents a sophisticated attack vector targeting Microsoft Outlook 2003 that exploits the interaction between Rich Text Format processing and OLE object handling within the Windows Media Player component. The flaw resides in how Outlook processes RTF messages containing embedded OLE objects that reference Windows Media Player functionality, creating a pathway for remote code execution that circumvents built-in security restrictions.
The technical implementation leverages the default zone security model that normally prevents scripting within media files by exploiting a design oversight in the RTF parsing engine. When Outlook encounters an RTF message with an embedded OLE object referencing Windows Media Player, it allows the media player to execute scripts that would normally be blocked by the player's security settings. This occurs because the OLE object embedding mechanism bypasses the normal security boundaries that typically protect against such script execution.
The operational impact of this vulnerability is significant as it enables attackers to execute arbitrary code on targeted systems without user interaction or explicit prompts. The vulnerability becomes particularly dangerous when combined with other exploits such as CVE-2004-0502, which provides predictable file location exposure that allows for automatic execution of malicious payloads. This combination creates a complete attack chain that can result in unauthorized software installation and potential system compromise.
Security researchers have classified this vulnerability under CWE-264, which addresses permissions, privileges, and access control issues, and it aligns with ATT&CK techniques related to privilege escalation and execution through legitimate system processes. The vulnerability demonstrates how seemingly isolated security controls can be bypassed through creative exploitation of component interactions within complex software applications.
Mitigation strategies should focus on implementing strict email content filtering and sandboxing mechanisms that prevent OLE object processing in email messages. Organizations should disable automatic media player scripting capabilities and implement comprehensive network security controls that monitor for suspicious RTF content. Additionally, regular security updates and patches should be applied immediately when available, as Microsoft has addressed this vulnerability through targeted security updates that modify the RTF parsing behavior and strengthen the default security restrictions for embedded media objects.
The broader implications of this vulnerability highlight the importance of defense-in-depth strategies and the need for organizations to maintain comprehensive security awareness training to prevent users from inadvertently executing malicious content through email attachments or embedded objects. Security professionals should also consider implementing email security gateways that can detect and block suspicious RTF content before it reaches end-user systems, particularly in environments where legacy applications like Outlook 2003 continue to be used.