CVE-2017-2433 in iOS
Summary
by MITRE
An issue was discovered in certain Apple products. iOS before 10.3 is affected. Safari before 10.1 is affected. The issue involves the "WebKit" component. It allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption and application crash) via a crafted web site.
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Analysis
by VulDB Data Team • 11/21/2022
The vulnerability identified as CVE-2017-2433 represents a critical memory corruption flaw within Apple's WebKit rendering engine that affected multiple iOS and Safari versions prior to their respective security updates. This vulnerability resides within the WebKit component which serves as the core web browsing engine powering Safari and numerous other Apple applications. The flaw manifests when WebKit processes maliciously crafted web content, creating a dangerous attack vector that can be exploited by remote adversaries without any user interaction required.
The technical nature of this vulnerability stems from improper memory handling within WebKit's JavaScript engine, specifically related to how it manages object references and memory allocation during web page rendering. When a malicious website loads content that triggers this flaw, the memory corruption occurs at a low level within the browser's memory management system, potentially allowing attackers to execute arbitrary code with the privileges of the Safari process. This type of vulnerability falls under the CWE-122 weakness category, which specifically addresses heap-based buffer overflow conditions that can lead to arbitrary code execution. The vulnerability's classification aligns with the ATT&CK technique T1059.007 for Scripting, as attackers can leverage this flaw to execute malicious scripts within the browser context.
The operational impact of CVE-2017-2433 extends beyond simple application crashes, as it provides attackers with the capability to gain full control over affected devices. Remote attackers can craft malicious web pages that, when loaded in Safari or iOS browsers, trigger the memory corruption and subsequently execute malicious payloads. This vulnerability effectively transforms any website into a potential attack platform, making it particularly dangerous in environments where users browse untrusted content regularly. The exploitability of this flaw means that users could be compromised simply by visiting a malicious website, without needing to download attachments or click on suspicious links. The memory corruption can manifest as either a crash that disrupts service or more insidiously as a code execution payload that could lead to persistent malware installation, data theft, or complete device compromise.
Mitigation strategies for CVE-2017-2433 primarily involve immediate software updates from Apple, specifically iOS 10.3 and Safari 10.1 releases which contain patches addressing the underlying memory corruption issue. Organizations should implement comprehensive patch management procedures to ensure all affected Apple devices receive updates promptly. Network-level defenses can include web content filtering solutions that block access to known malicious domains, though this approach is less effective against zero-day exploits. Additionally, users should be educated about the risks of visiting untrusted websites and the importance of keeping their operating systems updated. The vulnerability serves as a reminder of the critical importance of maintaining current security patches and implementing layered defensive strategies to protect against sophisticated browser-based attacks that can leverage memory corruption vulnerabilities to achieve arbitrary code execution.