CVE-2007-3033 in Windows
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in Windows Vista Feed Headlines Gadget (aka Sidebar RSS Feeds Gadget) in Windows Vista allows user-assisted remote attackers to execute arbitrary code via an RSS feed with crafted HTML attributes, which are not properly removed and are rendered in the local zone.
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Analysis
by VulDB Data Team • 01/05/2025
The vulnerability identified as CVE-2007-3033 represents a critical cross-site scripting flaw within the Windows Vista Feed Headlines Gadget, also known as the Sidebar RSS Feeds Gadget. This gadget was integrated into the Windows Vista operating system's Sidebar component, providing users with a convenient way to display RSS feed content directly on their desktop. The vulnerability specifically affects how the gadget processes and renders HTML content from RSS feeds, creating a dangerous attack vector that can be exploited by remote adversaries.
The technical flaw stems from insufficient input validation and sanitization within the gadget's HTML processing engine. When users subscribe to RSS feeds through the gadget, the system fails to properly sanitize HTML attributes contained within the feed content. This inadequate sanitization allows malicious HTML code to persist in the feed data and subsequently be rendered within the local security zone of the gadget. The vulnerability operates under CWE-79 which specifically addresses cross-site scripting flaws where untrusted data is improperly handled during web application processing. The gadget's failure to strip or properly encode potentially dangerous HTML attributes creates an environment where attacker-controlled content can execute within the context of the local zone, bypassing typical security boundaries.
The operational impact of this vulnerability extends beyond simple XSS exploitation to potentially enable arbitrary code execution. Attackers can craft malicious RSS feeds containing specially crafted HTML attributes that, when processed by the vulnerable gadget, can trigger code execution on the victim's system. This user-assisted attack vector means that victims must actively subscribe to the malicious feed, but once they do, the gadget becomes a conduit for executing malicious payloads. The local zone rendering context provides attackers with elevated privileges since the gadget operates with the same security permissions as the user, potentially allowing for privilege escalation or system compromise. This vulnerability aligns with ATT&CK technique T1059.007 which covers scriptlets and the execution of malicious code through web-based interfaces.
Mitigation strategies for CVE-2007-3033 should focus on both immediate remediation and long-term security hardening. Microsoft addressed this vulnerability through security updates that improved HTML sanitization within the gadget's processing pipeline. Organizations should ensure that all Windows Vista systems receive the applicable security patches, particularly those released in the July 2007 security update cycle. Additionally, network administrators should consider implementing feed filtering mechanisms to prevent the importation of RSS feeds from untrusted sources. The vulnerability highlights the importance of proper input validation and the principle of least privilege in gadget and sidebar component design. Security best practices recommend that all third-party components and gadgets undergo rigorous security testing for XSS vulnerabilities, particularly those that process untrusted web content. The incident also underscores the need for regular security assessments of desktop environments and the importance of maintaining current security patches across all operating system components.