CVE-2017-2386 in tvOS
Summary
by MITRE
An issue was discovered in certain Apple products. iOS before 10.3 is affected. Safari before 10.1 is affected. tvOS before 10.2 is affected. The issue involves the "WebKit" component. It allows remote attackers to bypass the Same Origin Policy and obtain sensitive information via a crafted web site.
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Analysis
by VulDB Data Team • 11/22/2022
The vulnerability identified as CVE-2017-2386 represents a critical security flaw within Apple's WebKit rendering engine that affects multiple operating systems and browser versions. This issue resides in the core web browsing component responsible for processing and displaying web content across Apple's ecosystem. The vulnerability specifically targets the Same Origin Policy implementation within WebKit, which serves as a fundamental security mechanism that prevents unauthorized access to resources across different domains. When compromised, this policy allows malicious actors to bypass essential web security boundaries that typically isolate content from different origins.
The technical nature of this vulnerability stems from improper handling of cross-origin resource sharing within the WebKit component. Attackers can craft malicious websites that exploit this weakness to access sensitive information that should be restricted to specific origins. This bypass enables unauthorized data access and potentially allows for more sophisticated attacks such as cross-site scripting or data exfiltration. The flaw operates at the browser engine level, making it particularly dangerous as it can affect any web content loaded through the vulnerable browsers regardless of the website's security practices.
The operational impact of CVE-2017-2386 extends across Apple's entire product portfolio that utilizes WebKit, including iOS devices running versions prior to 10.3, Safari browsers before version 10.1, and tvOS systems before 10.2. This widespread exposure means that users across multiple device types and platforms could be compromised through a single malicious website. The vulnerability creates a persistent security risk for users who visit compromised websites, as the attack can occur without any user interaction beyond navigating to the malicious site. Organizations using Apple devices for business operations face significant risks, as this flaw could enable attackers to access confidential information, session tokens, or other sensitive data that should remain protected by the Same Origin Policy.
Security researchers categorize this vulnerability under CWE-284, which deals with improper access control mechanisms, and it aligns with ATT&CK technique T1059.001 for command and control communications. The remediation strategy focuses on updating affected systems to versions that include patched WebKit components, with Apple releasing iOS 10.3, Safari 10.1, and tvOS 10.2 as the primary fixes. Organizations should prioritize immediate deployment of these updates across all affected devices and implement network monitoring to detect potential exploitation attempts. Additional mitigations include browser security hardening measures, user education about visiting untrusted websites, and implementing web application firewalls to detect and block malicious content that might exploit this vulnerability.