CVE-2007-0800 in Firefox
Summary
by MITRE
Cross-zone vulnerability in Mozilla Firefox 1.5.0.9 considers blocked popups to have an internal zone origin, which allows user-assisted remote attackers to cross zone restrictions and read arbitrary file:// URIs by convincing a user to show a blocked popup.
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Analysis
by VulDB Data Team • 07/15/2019
The cross-zone vulnerability identified as CVE-2007-0800 represents a critical security flaw in Mozilla Firefox version 1.5.0.9 that fundamentally undermines the browser's security model. This vulnerability stems from how Firefox handles popup windows and their associated security zones, creating a pathway for attackers to bypass essential security boundaries that separate different trust levels within the browser environment. The flaw specifically affects the zone-based security model that Firefox employs to protect users from potentially malicious content by restricting access to local file systems and other sensitive resources.
The technical implementation of this vulnerability lies in Firefox's handling of blocked popups, where the browser incorrectly assigns these blocked windows an internal zone origin rather than maintaining their proper security context. This misclassification allows malicious actors to exploit the security gap by crafting attacks that leverage user interaction to trigger blocked popup behavior. When a user is convinced to interact with a blocked popup through social engineering tactics, the vulnerability enables access to file:// URI resources that should normally be restricted to the local zone. The flaw essentially allows attackers to manipulate the browser's security zone enforcement mechanisms, creating a scenario where external content can effectively impersonate internal trusted sources.
The operational impact of this vulnerability is significant as it provides remote attackers with the capability to read arbitrary local files on a victim's system through a user-assisted attack vector. This cross-zone privilege escalation allows attackers to access sensitive information stored in local file systems, potentially including configuration files, personal documents, or other locally stored data that should remain protected from web-based access. The attack requires user interaction through social engineering to convince the victim to display a blocked popup, but once successful, it effectively neutralizes the browser's local file system security protections. This vulnerability directly relates to CWE-284, which addresses improper access control, and represents a classic example of how improper privilege management can lead to unauthorized data access.
Mitigation strategies for this vulnerability focus on both immediate browser updates and user education regarding the dangers of interacting with blocked popups. The most effective solution involves upgrading to a patched version of Firefox where the security zone handling has been corrected to properly maintain the security context of blocked popups. Organizations should implement comprehensive security awareness training to help users recognize and avoid social engineering attempts that might lead them to interact with malicious popups. Additionally, browser security policies should be reviewed to ensure that popup blocking is properly configured and that users understand the risks associated with disabling these protections. The vulnerability demonstrates the importance of maintaining strict security boundaries in web browsers and highlights how seemingly minor implementation flaws in security zone handling can result in significant privilege escalation capabilities for attackers. This case study serves as a reminder of the critical importance of proper zone enforcement in browser security architectures and the need for thorough testing of security model implementations.