CVE-2006-6987 in FineBrowser
Summary
by MITRE
Cross-domain vulnerability in FineBrowser Freeware 3.2.2 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 • 08/19/2018
This vulnerability exists in FineBrowser Freeware version 3.2.2 and represents a cross-domain information disclosure flaw that enables remote attackers to access restricted content from other domains. The vulnerability stems from the browser's improper handling of object tags with data parameters that reference external sites through HTTP Location headers. When an attacker crafts a malicious object tag that points to their own site and includes a Location header directing to a target domain, the browser processes this request in a manner that allows the target content to be exposed through the outerHTML attribute of the object element.
The technical mechanism behind this vulnerability involves the browser's cross-domain security policies being bypassed through the manipulation of HTTP headers and object embedding. Specifically, when the browser encounters an object tag with a data parameter referencing an attacker-controlled URL, it processes the Location header in the HTTP response to redirect to the target domain. The browser then makes the content from the target domain available through the outerHTML attribute of the object element, effectively creating a cross-domain information leakage channel. This behavior is similar to the previously documented CVE-2006-3280 vulnerability, which demonstrated comparable cross-domain data exposure mechanisms through different attack vectors.
The operational impact of this vulnerability is significant as it allows attackers to bypass standard cross-domain security restrictions that are fundamental to web browser security models. An attacker could potentially access sensitive information from other domains, including but not limited to internal network resources, user data, or system information that should be restricted to specific domains. The vulnerability affects the core security principle of same-origin policy enforcement, which is a critical component of web security architecture and is referenced in CWE-94 as an improper control of generation of code vulnerability. This weakness specifically relates to the improper handling of cross-domain requests and the exposure of internal resources through web browser object attributes.
This vulnerability aligns with several ATT&CK framework techniques including T1071.001 for application layer protocols and T1566 for credential access through social engineering. The attack vector relies on the manipulation of web browser objects and HTTP headers to create unauthorized data access pathways. Organizations using FineBrowser Freeware 3.2.2 should consider immediate mitigation through browser updates or the implementation of network-level controls that restrict cross-domain object embedding. The vulnerability demonstrates the importance of proper HTTP header validation and the need for robust cross-domain security policies in web browsers. Security practitioners should also implement monitoring for suspicious object tag usage and Location header manipulation patterns that could indicate exploitation attempts.
The flaw represents a failure in the browser's security model implementation and specifically addresses CWE-200, which deals with information exposure, and CWE-123, which covers weakness in the design of access control mechanisms. The vulnerability exploits the trust relationship between the browser and its object embedding mechanisms, allowing attackers to leverage legitimate browser functionality to access restricted resources. This type of vulnerability is particularly concerning because it operates at the browser level and can potentially bypass traditional network security controls that focus on network-level traffic inspection rather than application-level content manipulation. The similarity to CVE-2006-3280 indicates a pattern of vulnerabilities in how browsers handle cross-domain object references and HTTP header processing, suggesting that this represents a broader class of issues in web browser security implementations.