CVE-2018-4445 in Safari
Summary
by MITRE
"Clear History and Website Data" did not clear the history. The issue was addressed with improved data deletion. This issue affected versions prior to iOS 12.1.1, Safari 12.0.2.
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Analysis
by VulDB Data Team • 04/18/2020
The vulnerability described in CVE-2018-4445 represents a critical flaw in Apple's web browser implementation where the "Clear History and Website Data" functionality failed to properly remove browsing history from the system. This issue existed in versions of iOS prior to 12.1.1 and Safari 12.0.2, creating a persistent security gap that could allow attackers to maintain access to sensitive browsing information even after users believed they had cleared their history. The flaw directly impacts user privacy and could potentially expose confidential information, browsing patterns, and online activities that should have been permanently removed from the device.
The technical nature of this vulnerability stems from inadequate data sanitization processes within the browser's clearing mechanism. When users selected the "Clear History and Website Data" option, the system failed to completely purge all historical records from memory, potentially leaving behind cached data, temporary files, or database entries that could be recovered through forensic analysis or other means. This type of flaw falls under the broader category of improper data deletion and memory management issues that can compromise system integrity and user privacy. The vulnerability aligns with CWE-200, which addresses information exposure, and CWE-540, which covers the inclusion of sensitive information in error messages or logs.
The operational impact of this vulnerability extends beyond simple privacy concerns to encompass potential forensic and security implications for users who rely on the browser's clearing functionality for protection. Attackers could potentially exploit this weakness to reconstruct user browsing patterns, access previously visited websites, or recover sensitive information that users believed had been permanently deleted. This flaw particularly affects individuals who handle confidential information or require strong privacy protections, as the incomplete data deletion could expose their online activities to unauthorized parties. The vulnerability also demonstrates the importance of proper data sanitization in web browsers and mobile operating systems, where users expect complete removal of their digital footprint.
Apple addressed this issue through improved data deletion mechanisms in iOS 12.1.1 and Safari 12.0.2 updates, implementing more robust sanitization processes that ensure complete removal of browsing history and associated data. The fix likely involved enhanced memory management protocols, improved database cleanup procedures, and better verification mechanisms to confirm that all historical records are properly removed from the system. Security professionals should note that this vulnerability highlights the critical importance of thorough testing of privacy and security features, particularly in mobile environments where users may be unaware of the true extent of data deletion. Organizations should prioritize updating to patched versions and educating users about the importance of maintaining current software to prevent exploitation of known vulnerabilities. This remediation aligns with best practices in information security and demonstrates the necessity of comprehensive testing of data sanitization features to prevent information leakage and maintain user privacy protections.