CVE-2013-1012 in iOS
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in WebKit in Apple Safari before 6.0.5 allows remote attackers to inject arbitrary web script or HTML via vectors involving IFRAME elements.
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Analysis
by VulDB Data Team • 05/25/2021
The CVE-2013-1012 vulnerability represents a critical cross-site scripting flaw within Apple Safari's WebKit rendering engine that affected versions prior to 6.0.5. This vulnerability specifically targets the handling of IFRAME elements, creating a pathway for remote attackers to execute malicious scripts within the context of a user's browser session. The flaw exploits the browser's insufficient input validation mechanisms when processing embedded frame content, allowing attackers to inject arbitrary web script or HTML code that executes in the victim's browser environment.
This vulnerability operates through a classic XSS attack vector where malicious IFRAME elements contain crafted payloads designed to exploit the WebKit engine's parsing behavior. When Safari processes these malformed IFRAME tags, the browser fails to properly sanitize or escape the embedded content, leading to the execution of unintended JavaScript code or HTML markup. The vulnerability is particularly dangerous because IFRAME elements are commonly used in web applications, making this attack vector highly prevalent and difficult to detect through standard security measures. The flaw demonstrates a weakness in the browser's content security model and highlights the importance of proper input sanitization at multiple levels within web rendering engines.
The operational impact of CVE-2013-1012 extends beyond simple script execution, as it can enable sophisticated attack chains including session hijacking, credential theft, and redirection to malicious sites. Attackers can leverage this vulnerability to steal user sessions, modify web page content, or redirect users to phishing sites without their knowledge. The vulnerability affects all users of affected Safari versions, creating a broad attack surface that could be exploited across various web applications and services. Security professionals noted that this vulnerability was particularly concerning due to Safari's widespread use on macOS and iOS platforms, potentially exposing millions of users to coordinated attacks.
The technical implementation of this vulnerability aligns with CWE-79 which defines cross-site scripting as a weakness where untrusted data is sent to a web browser without proper validation or sanitization. This flaw also maps to ATT&CK technique T1566.001 which covers spearphishing attachments, as attackers could potentially deliver malicious IFRAME content through email campaigns or compromised websites. Organizations should prioritize updating affected Safari installations to version 6.0.5 or later, while implementing additional security measures such as Content Security Policy headers, input validation, and regular security audits of web applications. Browser vendors and security teams should consider this vulnerability as a reminder of the critical importance of robust input sanitization in web rendering engines and the need for continuous security testing of browser components.
The remediation approach for CVE-2013-1012 requires immediate patch deployment for all affected Safari installations, with additional network-level protections such as web application firewalls that can detect and block malicious IFRAME content. Security teams should also implement user education programs to raise awareness about suspicious web content and the importance of keeping browsers updated. Organizations with Safari-based applications should conduct thorough security assessments of their web applications to identify potential exploitation vectors and implement proper output encoding for all dynamic content. The vulnerability serves as a critical example of how seemingly minor rendering engine flaws can create significant security risks when exploited in real-world scenarios.