CVE-2015-5812 in iTunes
Summary
by MITRE
WebKit, as used in Apple iOS before 9 and iTunes before 12.3, 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-2015-09-16-1 and APPLE-SA-2015-09-16-3.
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Analysis
by VulDB Data Team • 11/22/2024
CVE-2015-5812 represents a critical memory corruption vulnerability within WebKit's JavaScript engine that affected Apple's mobile operating system and desktop media software. This vulnerability resides in the way WebKit processes certain JavaScript constructs, specifically in the handling of object properties and memory allocation patterns. The flaw manifests when malicious web content triggers improper memory management during JavaScript execution, leading to unpredictable memory corruption that can be exploited by remote attackers.
The technical exploitation of this vulnerability leverages memory corruption principles that align with common CWE categories including CWE-125: Out-of-bounds Read and CWE-787: Out-of-bounds Write. Attackers craft malicious web pages that, when loaded in Safari or iTunes, cause the browser engine to allocate memory incorrectly or access memory locations outside of allocated bounds. This memory corruption can be leveraged to execute arbitrary code with the privileges of the compromised application, effectively allowing remote code execution on the target system. The vulnerability is particularly dangerous because it operates at the browser engine level, bypassing many traditional security boundaries.
From an operational perspective, this vulnerability created significant risk for iOS users who were running versions prior to iOS 9 and iTunes users on versions before 12.3. The attack surface was extensive since any user visiting a compromised website could be targeted, making this a prime candidate for drive-by download attacks. The impact extends beyond simple code execution to include potential denial of service conditions that could crash applications and potentially lead to system instability. Security researchers noted that the vulnerability's exploitation was particularly concerning because it could be triggered without user interaction beyond visiting a malicious website, making it highly suitable for automated attacks.
The exploitation techniques for CVE-2015-5812 align with ATT&CK framework tactics including T1059.007: Command and Scripting Interpreter: JavaScript and T1203: Exploitation for Client Execution. Security professionals identified that the vulnerability could be chained with other exploits to create more sophisticated attack vectors, particularly in targeted campaigns. Organizations needed to implement immediate mitigation strategies including browser updates, network-based filtering, and user education to prevent exploitation. The vulnerability also highlighted the importance of regular security updates and the risks associated with legacy software versions that may not receive security patches.
Apple addressed this vulnerability through comprehensive code fixes in iOS 9 and iTunes 12.3, implementing memory safety improvements and enhanced input validation within the WebKit JavaScript engine. The fix involved strengthening memory allocation routines and improving bounds checking mechanisms to prevent the specific memory corruption patterns that enabled exploitation. Security teams recommended immediate deployment of these updates across all affected systems and implemented monitoring for potential exploitation attempts. The vulnerability serves as a critical example of how browser engine flaws can create widespread security risks, emphasizing the need for continuous security assessments and rapid response to emerging threats in web-based attack vectors.