CVE-2016-4598 in Mac OS X
Summary
by MITRE
QuickTime in Apple OS X before 10.11.6 allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a crafted image.
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Analysis
by VulDB Data Team • 10/01/2024
The vulnerability identified as CVE-2016-4598 represents a critical memory corruption flaw within Apple QuickTime media framework affecting macOS versions prior to 10.11.6. This vulnerability resides in the image parsing functionality of QuickTime, which is responsible for processing various multimedia file formats including images. The flaw manifests when QuickTime encounters specially crafted image files that trigger improper memory handling during the decoding process. Security researchers classified this issue as a remote code execution vulnerability because attackers can exploit it through maliciously crafted image files delivered via web browsers, email attachments, or other attack vectors that leverage QuickTime's image processing capabilities.
The technical implementation of this vulnerability stems from inadequate input validation and memory management within QuickTime's image parsing routines. When QuickTime processes malformed image files, the application fails to properly validate buffer boundaries and memory allocation parameters, leading to heap-based buffer overflows or other memory corruption conditions. These memory corruption issues can be leveraged by remote attackers to overwrite critical memory locations, potentially allowing them to execute arbitrary code with the privileges of the affected application. The vulnerability's classification as a memory corruption issue aligns with CWE-121, which describes heap-based buffer overflow conditions that can lead to arbitrary code execution. The flaw specifically impacts QuickTime's handling of image formats such as JPEG, PNG, and other supported multimedia file types, making it particularly dangerous in environments where users frequently interact with web content or email attachments.
The operational impact of CVE-2016-4598 extends beyond simple denial of service scenarios, as it presents a significant threat to enterprise security infrastructure. Organizations running affected macOS versions face potential compromise through social engineering attacks that deliver malicious image files through email campaigns or compromised websites. The vulnerability's remote exploitation capability means that attackers do not require local access to the system to exploit it, making it particularly dangerous for organizations with mobile workforces or those that do not maintain strict network segmentation. Additionally, the vulnerability's presence in QuickTime's core image processing functionality means that legitimate users could be compromised through normal browsing activities, including visiting compromised websites or opening seemingly benign email attachments. This attack surface aligns with ATT&CK technique T1068, which describes local privilege escalation and remote code execution through exploitation of software vulnerabilities. The vulnerability's impact is further amplified by the fact that QuickTime was often installed as a default component on macOS systems, making the attack surface widespread across both personal and enterprise environments.
Mitigation strategies for CVE-2016-4598 focus primarily on immediate system updates and application management. Apple released security patches for macOS 10.11.6 that addressed the memory corruption issues in QuickTime's image handling routines. Organizations should prioritize deployment of these patches across all affected systems, particularly in environments where users interact with untrusted web content or email systems. Additional defensive measures include implementing web content filtering solutions that can block or quarantine potentially malicious image files, disabling QuickTime plugin support in web browsers, and monitoring for unusual memory usage patterns that might indicate exploitation attempts. Network-based intrusion detection systems should be configured to detect attempts to access QuickTime-related services or file formats that could trigger the vulnerability. Security teams should also consider implementing application whitelisting policies that restrict the execution of QuickTime components to only trusted environments, thereby reducing the attack surface for this and similar vulnerabilities. The remediation approach aligns with industry best practices outlined in NIST SP 800-128 for vulnerability management and patch deployment, ensuring that organizations maintain defense-in-depth strategies against remote code execution threats.