CVE-2003-0604 in Windows Media Player
Summary
by MITRE
Windows Media Player (WMP) 7 and 8, as running on Internet Explorer and possibly other Microsoft products that process HTML, allows remote attackers to bypass zone restrictions and access or execute arbitrary files via an IFRAME tag pointing to an ASF file whose Content-location contains a File:// URL.
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Analysis
by VulDB Data Team • 05/26/2019
This vulnerability in Windows Media Player versions 7 and 8 represents a critical security flaw that exploits the interaction between media player components and web browser environments. The issue arises when Internet Explorer processes HTML content that includes an IFRAME tag referencing an ASF (Advanced Systems Format) file, where the Content-location header contains a file:// URL. This configuration creates an unexpected execution path that allows attackers to circumvent the security zone restrictions that normally prevent local file access from web-based content. The vulnerability specifically targets the way WMP handles embedded media content and processes URL references within HTML documents, creating a pathway for arbitrary file access and execution that bypasses standard browser security mechanisms.
The technical implementation of this flaw involves the manipulation of HTTP headers and URL processing within the web browser context. When an IFRAME tag references an ASF file with a Content-location header containing a file:// URL, Windows Media Player interprets this reference differently than expected, potentially executing the file from the local system rather than treating it as remote content. This behavior stems from insufficient validation of URL schemes and location headers during media processing, allowing attackers to craft malicious HTML content that appears benign but triggers the exploitation path. The vulnerability operates at the intersection of web browser security models and media player file handling, where the expected security boundaries are crossed through improper URL resolution and content processing.
The operational impact of this vulnerability is significant as it enables remote attackers to execute arbitrary code on vulnerable systems with the privileges of the user running Internet Explorer. Attackers can leverage this flaw to download and execute malicious files, potentially leading to complete system compromise, data exfiltration, or further lateral movement within networks. The vulnerability affects not only Internet Explorer but also other Microsoft products that process HTML and handle ASF files, expanding the potential attack surface. This type of attack is particularly dangerous because it can be delivered through standard web browsing activities, making it difficult to detect and prevent through traditional network monitoring approaches. The exploitation requires minimal user interaction beyond visiting a malicious webpage, making it highly effective for phishing campaigns and drive-by download attacks.
Security mitigations for this vulnerability include immediate deployment of Microsoft security patches and updates that address the improper URL handling and zone restriction bypass. Organizations should implement browser security configurations that restrict IFRAME usage and content loading from untrusted sources. Network administrators should consider implementing web application firewalls and content filtering solutions that can detect and block malicious IFRAME references containing file:// URLs. The vulnerability aligns with CWE-22 (Improper Limitation of a Pathname to a Restricted Directory) and CWE-264 (Permissions, Privileges, and Access Controls) categories, demonstrating how improper input validation and access control mechanisms can lead to privilege escalation. From an ATT&CK framework perspective, this vulnerability maps to T1059 (Command and Scripting Interpreter) and T1203 (Exploitation for Client Execution) tactics, as it enables attackers to execute arbitrary commands and gain initial access through client-side exploitation. Regular security assessments and user education about avoiding suspicious web content remain essential defensive measures against this class of vulnerability.