CVE-2015-3733 in iTunes
Summary
by MITRE
WebKit, as used in Apple iOS before 8.4.1 and Safari before 6.2.8, 7.x before 7.1.8, and 8.x before 8.0.8, allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption and application crash) via a crafted web site, a different vulnerability than other WebKit CVEs listed in APPLE-SA-2015-08-13-1 and APPLE-SA-2015-08-13-3.
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Analysis
by VulDB Data Team • 06/17/2022
CVE-2015-3733 represents a critical memory corruption vulnerability within WebKit's JavaScript engine that affected Apple's mobile and desktop operating systems. This vulnerability resides in the way WebKit processes certain JavaScript objects and memory allocations, creating a condition where remote attackers could manipulate memory structures through maliciously crafted web content. The flaw specifically impacts the garbage collection mechanisms and object reference handling within the JavaScriptCore engine, allowing for arbitrary code execution or system crashes when processing specially crafted web pages.
The technical implementation of this vulnerability stems from improper handling of JavaScript object lifecycles and memory management within WebKit's rendering engine. Attackers could construct web pages containing malicious JavaScript code that would trigger buffer overflows or use-after-free conditions when the browser attempted to process complex object interactions. This memory corruption occurs during the execution of JavaScript operations that involve object creation, deletion, and reference counting mechanisms, making it particularly dangerous as it can be exploited through standard web browsing activities without requiring any special privileges or user interaction beyond visiting a compromised website.
The operational impact of CVE-2015-3733 extends beyond simple denial of service scenarios to encompass full system compromise capabilities. When successfully exploited, this vulnerability allows remote attackers to execute arbitrary code with the privileges of the web browser process, potentially leading to complete system compromise. The vulnerability affects multiple versions of Apple's ecosystem including iOS versions prior to 8.4.1 and various Safari browser versions across different operating systems, creating widespread exposure across Apple's user base. The attack vector is particularly concerning as it requires no user interaction beyond visiting a malicious website, making it a prime candidate for drive-by download attacks and targeted campaigns.
This vulnerability aligns with CWE-122, which describes improper restriction of operations within a memory buffer, and demonstrates characteristics consistent with the attack patterns documented in the MITRE ATT&CK framework under the T1059.007 technique for script-based execution. The exploitation typically involves crafting JavaScript code that triggers memory corruption through specific object manipulation sequences, often leveraging heap spraying techniques to ensure successful exploitation. Security researchers have noted that this vulnerability shares common characteristics with other WebKit memory corruption issues but presents distinct exploitation patterns that differentiate it from other CVEs referenced in the Apple security advisories.
Mitigation strategies for CVE-2015-3733 primarily focus on immediate system updates and patch management procedures. Organizations should prioritize updating all affected Apple devices to the latest available versions, specifically iOS 8.4.1 and corresponding Safari browser versions. Network administrators should implement web content filtering solutions that can detect and block known malicious JavaScript patterns, while security teams should monitor for exploitation attempts through network traffic analysis. Browser hardening measures including sandboxing, privilege separation, and memory protection mechanisms should be enabled to limit the potential impact of successful exploitation attempts. Additionally, user education regarding safe browsing practices and the importance of keeping software current remains crucial in defending against this class of vulnerabilities.