CVE-2018-4309 in iCloud
Summary
by MITRE
A cross-site scripting issue existed in Safari. This issue was addressed with improved URL validation. This issue affected versions prior to iOS 12, tvOS 12, Safari 12, iTunes 12.9 for Windows, iCloud for Windows 7.7.
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Analysis
by VulDB Data Team • 08/22/2023
The vulnerability identified as CVE-2018-4309 represents a cross-site scripting flaw that impacted Apple's Safari web browser and related software components. This security weakness allowed malicious actors to inject arbitrary JavaScript code into web pages viewed by Safari users, potentially compromising user sessions and enabling unauthorized access to sensitive information. The vulnerability stemmed from insufficient validation of URL parameters and web addresses, creating opportunities for attackers to craft malicious links that could execute harmful scripts within the browser context. The flaw was particularly concerning given Safari's widespread use across Apple's ecosystem, affecting not only desktop users but also those utilizing iOS devices, tvOS systems, and Windows-based applications that relied on Apple's web technologies.
The technical implementation of this vulnerability falls under the CWE-79 category of Cross-Site Scripting, specifically representing a classic reflected XSS attack vector. The flaw occurred when Safari failed to properly sanitize user-supplied input from URLs before rendering them in web pages, allowing attackers to inject malicious script payloads through parameters in web addresses. This weakness was particularly dangerous because it could be exploited through various attack vectors including phishing emails, malicious websites, or compromised web applications that users might inadvertently visit. The vulnerability's exploitation required minimal user interaction, often just clicking on a malicious link, making it particularly effective for large-scale attacks targeting Apple device users.
The operational impact of CVE-2018-4309 extended across multiple Apple platforms and software versions, creating a significant security risk for users of iOS 11 and earlier versions, tvOS 11 and earlier, Safari 11 and earlier, and the corresponding Windows applications. This cross-platform nature meant that attackers could potentially target users across different devices and operating systems, amplifying the vulnerability's reach and impact. The affected software versions included critical components of Apple's ecosystem such as iCloud for Windows, iTunes for Windows, and Safari itself, which meant that users could be compromised regardless of their primary device platform. The vulnerability's presence in these widely-used applications created a substantial attack surface that could be leveraged to steal session cookies, perform unauthorized actions on behalf of users, or redirect users to malicious sites.
Apple's response to this vulnerability involved implementing enhanced URL validation mechanisms that properly sanitized and escaped user input before processing web addresses. This fix aligned with the ATT&CK framework's mitigation strategies for web application attacks, specifically addressing the T1059.007 technique related to script injection. The remediation required updates to Safari's core rendering engine and URL parsing components, ensuring that potentially malicious content would be neutralized before execution. Users were advised to update to the affected versions including iOS 12, tvOS 12, Safari 12, iTunes 12.9 for Windows, and iCloud for Windows 7.7, which contained the necessary security patches. The resolution demonstrated Apple's commitment to maintaining secure web browsing experiences while highlighting the ongoing challenge of protecting users against sophisticated web-based attacks that exploit browser rendering vulnerabilities. Organizations needed to ensure timely deployment of these updates across their Apple device fleets to maintain security posture and prevent exploitation of this particular XSS vulnerability.