CVE-2013-5158 in iOS
Summary
by MITRE
The Social subsystem in Apple iOS before 7 does not properly restrict access to the cache of Twitter icons, which allows physically proximate attackers to obtain sensitive information about recent Twitter interaction via unspecified vectors.
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Analysis
by VulDB Data Team • 05/25/2021
The vulnerability identified as CVE-2013-5158 resides within Apple iOS versions prior to 7.0, specifically affecting the social subsystem's handling of Twitter icon caching mechanisms. This flaw represents a critical privacy concern that stems from inadequate access controls within the operating system's cache management system. The vulnerability manifests when the iOS device stores Twitter profile icons in a cache that should remain protected from unauthorized access. Attackers capable of physical proximity to the target device can exploit this weakness to extract sensitive information regarding recent Twitter interactions. The unspecified vectors mentioned in the description suggest that the attack could occur through various means including direct device access, side-channel attacks, or through the exploitation of adjacent network access points. This vulnerability directly impacts user privacy by exposing metadata about social media interactions that users may not have intended to share publicly.
The technical implementation of this vulnerability involves the improper enforcement of access controls within iOS's cache subsystem. When users interact with Twitter through the iOS social integration features, profile icons are cached locally on the device for performance optimization. However, the cache mechanism fails to properly isolate these cached elements from unauthorized access attempts. The flaw likely stems from insufficient sandboxing controls or improper file system permissions that allow local processes or physically proximate attackers to access cache directories containing Twitter icon data. This represents a classic example of inadequate privilege separation where sensitive cached data should be restricted to specific applications or user sessions but remains accessible to other system components or unauthorized entities. The vulnerability falls under the category of information disclosure through improper access control mechanisms.
The operational impact of CVE-2013-5158 extends beyond simple privacy concerns to encompass broader security implications for iOS users. Attackers exploiting this vulnerability could gain insights into a user's social media activity patterns, including which accounts they follow, how frequently they interact with specific users, and potentially even their social network structure. This information could be leveraged for social engineering attacks, targeted phishing campaigns, or other forms of malicious activity that exploit social relationships. The physical proximity requirement limits the attack surface but does not eliminate the threat, as attackers may gain access through legitimate means such as device theft, temporary access during repair processes, or through social engineering to gain physical contact with the device. The vulnerability's impact is particularly concerning given that Twitter interactions often reveal personal information, professional relationships, and behavioral patterns that could be valuable to adversaries.
From a cybersecurity framework perspective, this vulnerability aligns with CWE-284, which addresses improper access control mechanisms, and represents a failure in the principle of least privilege. The ATT&CK framework categorizes this issue under privilege escalation and credential access tactics, where attackers can obtain unauthorized access to cached data that should remain protected. The vulnerability demonstrates how seemingly benign caching operations can become security risks when proper access controls are not implemented. Mitigation strategies should focus on implementing proper file system permissions, enhancing sandboxing mechanisms, and ensuring that cached social media data remains isolated from unauthorized access attempts. Apple's subsequent patch for iOS 7.0 addressed these access control issues by implementing stricter cache isolation and proper privilege enforcement. Organizations should also consider implementing device encryption, strong authentication mechanisms, and regular security updates to prevent exploitation of similar vulnerabilities in their mobile environments.