CVE-2006-6983 in MYweb4net Browser
Summary
by MITRE
Cross-domain vulnerability in MYweb4net Browser 3.8.8.0 allows remote attackers to access restricted information from other domains via an object tag with a data parameter that references a link on the attacker s originating site that specifies a Location HTTP header that references the target site, which then makes that content available through the outerHTML attribute of the object, a similar vulnerability to CVE-2006-3280.
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Analysis
by VulDB Data Team • 10/14/2017
This vulnerability represents a sophisticated cross-domain access flaw in MYweb4net Browser version 3.8.8.0 that exploits the browser's handling of object tags and HTTP headers to bypass security boundaries between domains. The vulnerability operates through a carefully crafted object tag with a data parameter that points to a malicious link hosted on the attacker's domain. When the browser processes this object, it follows the Location HTTP header directive that references the target site, effectively tricking the browser into retrieving content from a restricted domain and making it accessible through the outerHTML attribute of the object element. This creates a pathway for remote attackers to access information that should be protected by cross-domain security policies, fundamentally undermining the browser's security model.
The technical implementation of this vulnerability leverages the browser's object tag processing mechanism and HTTP header handling to create an unauthorized cross-domain data transfer channel. When the browser encounters the object tag with the malicious data parameter, it follows the Location HTTP header to fetch content from the target domain, which then becomes accessible through the outerHTML attribute. This behavior creates a security boundary violation where content from one domain becomes accessible to another domain without proper authorization. The vulnerability is particularly concerning because it operates at the browser level and can be exploited through standard web content without requiring special privileges or complex attack vectors. This type of vulnerability is classified under CWE-200 as "Information Exposure" and represents a classic case of cross-domain information leakage.
The operational impact of this vulnerability extends beyond simple information disclosure, as it enables attackers to potentially access sensitive data from other domains that should be protected by the browser's same-origin policy. Attackers can leverage this flaw to gather information from restricted domains, potentially including authentication tokens, session data, or other confidential information. The vulnerability is particularly dangerous in environments where multiple domains are accessed within the same browser context, as it could allow attackers to aggregate data from various sources. This type of attack falls under the ATT&CK framework category of T1071.004 for Application Layer Protocol: DNS and T1566 for Phishing, as it involves crafting malicious web content that exploits browser behavior to access unauthorized resources.
Mitigation strategies for this vulnerability must address both the browser-level implementation and the broader security architecture. Browser vendors should implement stricter validation of object tag parameters and HTTP headers to prevent unauthorized cross-domain content access. The recommended approach includes updating the browser to a patched version that properly enforces cross-domain security policies and implementing Content Security Policy headers that restrict object tag usage. Organizations should also consider deploying web application firewalls that can detect and block suspicious object tag usage patterns, as well as implementing proper network segmentation to limit the potential impact of such attacks. Additionally, regular security audits should verify that object tag handling and HTTP header processing conform to security best practices, and that proper access controls are in place to prevent unauthorized data access across domain boundaries. This vulnerability demonstrates the critical importance of maintaining robust cross-domain security controls in web browsers and the need for continuous monitoring and updating of security measures to address emerging threats.