CVE-2008-4232 in iPhone OS
Summary
by MITRE
Safari in Apple iPhone OS 2.0 through 2.1 and iPhone OS for iPod touch 2.1 through 2.1 does not restrict an IFRAME s content display to the boundaries of the IFRAME, which allows remote attackers to spoof a user interface via a crafted HTML document.
If you want to get best quality of vulnerability data, you may have to visit VulDB.
Analysis
by VulDB Data Team • 08/30/2019
This vulnerability exists in Apple iPhone OS versions 2.0 through 2.1 and iPod touch OS 2.1, representing a critical security flaw in the Safari web browser implementation. The issue stems from improper handling of iframe content rendering where the browser fails to properly contain display boundaries for iframe elements. This technical deficiency allows malicious actors to craft HTML documents that can bypass normal visual constraints, enabling unauthorized interface manipulation. The vulnerability specifically affects the rendering engine's approach to iframe containment, creating a window for cross-site scripting and user interface spoofing attacks.
The core technical flaw manifests when Safari processes HTML documents containing specially crafted iframe elements that do not respect their defined boundaries. This behavior creates a security boundary violation where content from one iframe can potentially overlay or interfere with other interface elements, allowing attackers to construct deceptive user experiences. The vulnerability operates at the rendering layer of the browser, where proper containment mechanisms fail to enforce visual boundaries. According to CWE standards, this represents a weakness in the implementation of containment or sandboxing mechanisms, specifically CWE-676, which deals with the use of potentially dangerous functions or constructs. The flaw essentially allows for a form of visual spoofing where attackers can manipulate the browser's display behavior to create misleading interfaces.
The operational impact of this vulnerability extends beyond simple visual deception to potential security risks including phishing attacks, credential harvesting, and user manipulation. Attackers can exploit this weakness to create fake login screens, fraudulent bank interfaces, or deceptive administrative panels that appear legitimate to users. The vulnerability enables a form of user interface redressing attack where users are tricked into interacting with malicious interfaces that masquerade as legitimate applications or websites. This type of attack aligns with ATT&CK framework technique T1531, which covers "Account Access Removal" through deceptive interface manipulation, though the primary impact here is user deception rather than direct account access. The vulnerability essentially undermines user trust in the browser's interface integrity and can lead to significant security incidents when users are misled into providing sensitive information.
Mitigation strategies for this vulnerability require immediate system updates to newer iPhone OS versions where Apple has implemented proper iframe boundary containment. Users should ensure their devices are running the latest available software versions, as Apple typically addresses such rendering engine issues in security updates. Network administrators should consider implementing web filtering solutions that can detect and block suspicious HTML content containing malformed iframe structures. The vulnerability highlights the importance of proper sandboxing mechanisms in mobile browsers and emphasizes the need for comprehensive testing of rendering engines against boundary violation attacks. Organizations should also implement user awareness training to help identify potentially deceptive interfaces that might exploit this vulnerability, particularly when users encounter unexpected or suspicious login prompts. Security monitoring should include detection of unusual iframe behaviors in web traffic to identify potential exploitation attempts.