CVE-2015-6982 in iOS
Summary
by MITRE
WebKit, as used in Apple iOS before 9.1, 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-2015-10-21-1.
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Analysis
by VulDB Data Team • 09/13/2025
The vulnerability identified as CVE-2015-6982 represents a critical memory corruption flaw within WebKit's JavaScript engine implementation in Apple iOS versions prior to 9.1. This vulnerability exists within the rendering engine that powers Safari and other web-based applications on iOS devices, creating a pathway for remote code execution attacks. The flaw manifests when malicious websites attempt to exploit memory handling inconsistencies in WebKit's JavaScript interpreter, specifically targeting the way the engine processes certain JavaScript code patterns that lead to buffer overflows or use-after-free conditions. The vulnerability is particularly concerning because it operates entirely through web-based attacks without requiring any user interaction beyond visiting a compromised website, making it highly exploitable in real-world scenarios.
The technical nature of this vulnerability stems from improper memory management within WebKit's JavaScript engine, which falls under CWE-125: Out-of-bounds Read and CWE-787: Out-of-bounds Write. Attackers can craft malicious JavaScript code that triggers memory corruption when executed in the browser context, leading to arbitrary code execution or application crashes. The memory corruption occurs during JavaScript object handling and garbage collection processes, where the engine fails to properly validate memory access patterns when processing complex JavaScript constructs. This type of vulnerability is classified as a remote code execution flaw because it can be exploited entirely through web traffic without requiring physical access to the device or any local privilege escalation. The attack vector leverages the browser's JavaScript engine to manipulate memory layout and overwrite critical program structures, potentially allowing attackers to execute malicious code with the privileges of the browser process.
The operational impact of CVE-2015-6982 extends beyond simple application crashes to encompass full system compromise potential, as demonstrated by similar vulnerabilities in the WebKit ecosystem. When exploited successfully, this vulnerability can lead to complete device compromise, allowing attackers to install malicious applications, access sensitive user data, and potentially escalate privileges to system-level access. The vulnerability affects all iOS devices running versions prior to 9.1, including iPhone, iPad, and iPod touch models, making it a widespread concern across Apple's mobile platform. This type of vulnerability aligns with ATT&CK technique T1059.007: Command and Scripting Interpreter: JavaScript, as it leverages JavaScript execution environments to achieve its malicious objectives. The flaw's exploitation can result in persistent backdoors, data exfiltration, and surveillance capabilities that persist even after the initial attack vector is closed.
Mitigation strategies for CVE-2015-6982 focus primarily on immediate system updates and security hardening measures. Apple's recommended solution involves upgrading to iOS 9.1 or later versions, which contain patches addressing the memory corruption issues in WebKit's JavaScript engine. Organizations should implement network-level protections including web filtering solutions that can block known malicious domains and content, while also deploying endpoint protection solutions that monitor for suspicious JavaScript behavior. Browser security configurations should be hardened by disabling unnecessary JavaScript features and implementing strict content security policies to limit the attack surface. Security teams should also consider deploying mobile device management solutions that can enforce security policies and automatically update iOS devices to patched versions. The vulnerability demonstrates the importance of regular security updates and continuous monitoring of browser-based attack vectors, as similar memory corruption flaws have been documented in other browser engines and operating systems, making this a critical area for ongoing security assessment and remediation efforts.