CVE-2003-1107 in Windows Media Player
Summary
by MITRE
The DHTML capability in Microsoft Windows Media Player (WMP) 6.4, 7.0, 7.1, and 9 may run certain URL commands from a security zone that is less trusted than the current zone, which allows attackers to bypass intended access restrictions.
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Analysis
by VulDB Data Team • 11/19/2024
The vulnerability described in CVE-2003-1107 represents a significant security flaw in Microsoft Windows Media Player versions 6.4, 7.0, 7.1, and 9 that relates to improper handling of DHTML content and security zone boundaries. This issue stems from the way WMP processes embedded HTML content within media files, particularly when those files contain URL commands that should be restricted based on security zone policies. The flaw allows malicious actors to execute commands from less trusted security zones, effectively circumventing the intended security controls that separate trusted and untrusted content sources.
The technical implementation of this vulnerability involves the DHTML (Dynamic HTML) capabilities within Windows Media Player's rendering engine. When WMP encounters media files containing embedded DHTML content, it processes URL commands that are typically restricted based on the security zone of the content source. The flaw occurs because WMP fails to properly enforce security zone boundaries when executing these commands, allowing commands from a less trusted zone to be executed within the context of a more trusted zone. This cross-zone execution represents a classic privilege escalation vulnerability where untrusted content gains access to trusted execution contexts.
From an operational perspective, this vulnerability poses substantial risks to users who may inadvertently open malicious media files or visit compromised websites that serve such content. Attackers can exploit this weakness by creating specially crafted media files or web pages that contain DHTML commands designed to execute harmful actions such as downloading additional malware, modifying system files, or accessing sensitive data. The impact extends beyond simple malware execution as it represents a fundamental breakdown in the security model of the Windows Media Player application, potentially allowing attackers to perform actions that should be restricted by security policies. This vulnerability particularly affects environments where users may encounter untrusted content from web sources or email attachments containing media files.
The security implications of CVE-2003-1107 align with CWE-284, which describes improper access control vulnerabilities, and relates to the broader category of privilege escalation flaws in software applications. This weakness can be mapped to ATT&CK technique T1059.007 for command and scripting interpreter usage, as attackers may leverage this vulnerability to execute arbitrary commands. Organizations should implement multiple layers of defense including regular security updates, user education about avoiding untrusted media content, and network-level filtering to prevent access to known malicious sources. The vulnerability also highlights the importance of sandboxing techniques and security zone enforcement mechanisms that should be implemented across all media processing applications to prevent similar cross-zone execution scenarios. Microsoft addressed this vulnerability through security patches that corrected the DHTML command processing behavior and enforced proper security zone boundaries, emphasizing the critical nature of maintaining secure content handling in multimedia applications.