CVE-2014-1303 in iOS
Summary
by MITRE
Heap-based buffer overflow in Apple Safari 7.0.2 allows remote attackers to execute arbitrary code and bypass a sandbox protection mechanism via unspecified vectors, as demonstrated by Liang Chen during a Pwn2Own competition at CanSecWest 2014.
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Analysis
by VulDB Data Team • 05/09/2026
The heap-based buffer overflow vulnerability identified as CVE-2014-1303 represents a critical security flaw in Apple Safari version 7.0.2 that fundamentally undermines the browser's security architecture. This vulnerability operates within the heap memory management system of the web browser, creating an exploitable condition where malicious input can overwrite adjacent memory regions. The flaw specifically targets the memory allocation patterns used by Safari's rendering engine, allowing attackers to manipulate heap metadata and control program execution flow. The vulnerability was particularly significant because it not only enabled arbitrary code execution but also bypassed the sandbox protection mechanisms that are designed to contain malicious activities within isolated environments. During the Pwn2Own competition at CanSecWest 2014, researcher Liang Chen successfully demonstrated this vulnerability, showcasing how attackers could leverage the heap overflow to gain full system control while circumventing Safari's security boundaries. This type of vulnerability falls under CWE-121 heap-based buffer overflow, which is classified as a critical weakness in memory safety that directly relates to the improper handling of buffer boundaries in heap-allocated memory regions. The attack vector leverages the browser's handling of web content, particularly when processing malformed or maliciously crafted HTML elements, JavaScript, or other web resources that trigger the vulnerable code path. The exploit demonstrates the intersection of multiple attack techniques including memory corruption, code execution, and sandbox escape, making it particularly dangerous in real-world scenarios where users might encounter malicious web content.
The operational impact of CVE-2014-1303 extends far beyond simple arbitrary code execution, as it fundamentally compromises the security model that Safari employs to protect users from malicious web content. When exploited, this vulnerability allows attackers to bypass the sandbox protection that isolates browser processes from the underlying operating system, effectively removing the security boundaries that prevent malicious code from accessing sensitive system resources. The heap overflow enables attackers to manipulate memory structures in ways that can lead to privilege escalation, file system access, and persistence mechanisms. The sandbox bypass is particularly concerning because it undermines the core security principle that web browser processes should be isolated from system-level operations. This vulnerability affects all users running Safari 7.0.2 regardless of their security awareness or system configurations, as the exploit can be triggered through normal web browsing activities. The attack requires no user interaction beyond visiting a malicious website, making it highly dangerous in phishing campaigns or compromised websites. From an ATT&CK framework perspective, this vulnerability maps to multiple techniques including T1059 command and scripting interpreter, T1068 local privilege escalation, and T1134 credential access, as attackers can leverage the compromised browser to access system credentials and escalate privileges. The vulnerability also aligns with T1078 valid accounts and T1210 exploitation for credential theft, since the sandbox escape allows attackers to access system resources that were previously protected.
The mitigation strategies for CVE-2014-1303 require immediate action from users and organizations to address the critical security risk. Apple released Safari 7.0.3 and subsequent updates that fixed the heap-based buffer overflow by implementing proper bounds checking and memory management controls. Organizations should prioritize immediate patch deployment across all affected systems and implement browser security policies that restrict access to untrusted websites. Network administrators should consider implementing web filtering solutions and browser hardening measures to reduce the attack surface. The vulnerability highlights the importance of keeping software updated and demonstrates how even well-established browsers can contain critical flaws that require rapid response. Security teams should monitor for exploitation attempts and implement intrusion detection systems that can identify potential exploitation attempts targeting this vulnerability. The fix implemented by Apple involved strengthening heap memory management routines and adding additional validation checks to prevent the overflow condition from occurring in the first place. This type of vulnerability also underscores the necessity of regular security assessments and penetration testing to identify similar memory corruption flaws in browser engines and other complex software systems. The incident serves as a reminder of the critical importance of secure coding practices and the need for comprehensive memory safety validation in browser security architectures. Organizations should also consider implementing additional security layers such as exploit protection mechanisms, application whitelisting, and user behavior analytics to detect and prevent exploitation attempts targeting this and similar vulnerabilities. The vulnerability's demonstration at a public security competition emphasizes the ongoing threat landscape and the need for continuous vigilance in protecting against sophisticated exploitation techniques that can bypass traditional security controls.