CVE-2012-0585 in iOS
Summary
by MITRE
The Private Browsing feature in Safari in Apple iOS before 5.1 allows remote attackers to bypass intended privacy settings and insert history entries via JavaScript code that calls the (1) pushState or (2) replaceState method.
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Analysis
by VulDB Data Team • 01/27/2025
The vulnerability described in CVE-2012-0585 represents a critical flaw in Apple iOS Safari's Private Browsing implementation that fundamentally undermines user privacy expectations. This issue affects iOS versions prior to 5.1 and specifically targets the browser's handling of history management within private browsing sessions. The flaw enables malicious actors to circumvent the core privacy protections that users rely upon when engaging in private browsing modes, creating a significant security risk for individuals who expect their browsing activities to remain confidential.
The technical mechanism behind this vulnerability involves the manipulation of JavaScript history APIs, specifically the pushState and replaceState methods that are part of the HTML5 History API specification. These methods are designed to allow web applications to modify the browser's history stack without triggering navigation events. However, in the affected iOS versions, Safari's private browsing mode failed to properly restrict access to these APIs, allowing JavaScript code executed within private browsing contexts to manipulate the browser history. This creates a direct pathway for attackers to insert entries into the browser's history database, effectively compromising the privacy assurances that private browsing is supposed to provide.
From an operational impact perspective, this vulnerability enables attackers to track user behavior across different websites and sessions, even when users believe they are browsing privately. The implications extend beyond simple privacy violations to potential security risks including session hijacking, targeted advertising tracking, and the ability to correlate user activities across multiple browsing sessions. The vulnerability essentially allows for the creation of a persistent tracking mechanism that defeats the fundamental purpose of private browsing mode, which is to prevent the browser from storing any record of user activities.
The flaw aligns with CWE-200, which addresses information exposure, and represents a failure in access control mechanisms within the browser's security model. From an ATT&CK framework perspective, this vulnerability maps to T1566, representing the use of malicious content to gain access to user systems, and potentially T1071, where adversaries leverage web protocols and applications to achieve their objectives. The vulnerability demonstrates how seemingly benign browser APIs can be exploited to undermine security boundaries when proper access controls are not implemented.
Mitigation strategies for this vulnerability required immediate system updates to iOS 5.1 or later versions where Apple addressed the issue through proper restriction of history manipulation APIs in private browsing contexts. Organizations should ensure their iOS devices remain updated with the latest security patches and implement additional monitoring to detect unusual browser behavior. Users should be educated about the importance of keeping their operating systems current and understanding that private browsing modes, while helpful, should not be considered absolute privacy guarantees without proper system updates and security configurations in place.