CVE-2013-0971 in Mac OS X
Summary
by MITRE
Use-after-free vulnerability in PDFKit in Apple Mac OS X before 10.8.3 allows remote attackers to execute arbitrary code or cause a denial of service (application crash) via crafted ink annotations in a PDF document.
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Analysis
by VulDB Data Team • 05/06/2021
The vulnerability identified as CVE-2013-0971 represents a critical use-after-free flaw within PDFKit, Apple's native PDF rendering framework utilized in Mac OS X operating systems. This vulnerability specifically affects versions prior to 10.8.3, creating a significant security risk for users who have not applied the necessary patches. The flaw manifests when PDFKit processes ink annotations within maliciously crafted PDF documents, exploiting a fundamental memory management error that can be remotely exploited by attackers. The vulnerability is classified under CWE-416 as a use-after-free condition, where memory is accessed after it has been freed, potentially leading to unpredictable behavior and exploitation opportunities. This issue falls within the ATT&CK framework under T1203 Exploitation for Client Execution, as it enables remote code execution through compromised PDF rendering functionality.
The technical exploitation of this vulnerability occurs through the manipulation of ink annotations within PDF files, which are typically used for drawing or highlighting elements within documents. When a malicious PDF document containing specially crafted ink annotations is opened, PDFKit's processing routine fails to properly validate memory references associated with these annotations. This failure creates a scenario where freed memory blocks are accessed again, potentially allowing attackers to manipulate memory contents or inject malicious code. The vulnerability's remote exploitability means that users can be compromised simply by opening a malicious PDF file, either through email attachments, web browsing, or file downloads. The use-after-free condition can result in either arbitrary code execution or denial of service, with the former presenting a severe risk of system compromise and the latter potentially enabling denial of service attacks against critical applications.
The operational impact of CVE-2013-0971 extends beyond individual user systems to affect enterprise environments where PDF documents are frequently exchanged and processed. Organizations utilizing Mac OS X systems for document management, legal proceedings, or business communications face significant risk from this vulnerability, as attackers can leverage it to gain unauthorized access to sensitive information or disrupt business operations. The vulnerability's classification as a remote code execution flaw means that attackers do not require physical access to target systems, making it particularly dangerous in networked environments. Security professionals must consider this vulnerability alongside other PDF-related threats and implement comprehensive monitoring for suspicious PDF file handling activities. The vulnerability also highlights the importance of timely patch management, as the issue was resolved in Mac OS X 10.8.3, demonstrating how quickly such flaws can be addressed when properly identified and patched.
Mitigation strategies for CVE-2013-0971 primarily focus on immediate system updates and defensive measures. Organizations should prioritize updating all Mac OS X systems to version 10.8.3 or later, which contains the necessary patches to address the memory management issue within PDFKit. Additionally, implementing content filtering solutions that scan PDF files for malicious annotations can provide an additional layer of protection. Security teams should also consider implementing application sandboxing and restricting PDF file handling capabilities where possible. Network administrators can deploy intrusion detection systems to monitor for suspicious PDF file transfers and implement email filtering that blocks potentially malicious PDF attachments. The vulnerability's resolution demonstrates the importance of maintaining current security patches and the potential consequences of delaying updates. Organizations should also conduct regular security assessments to identify similar memory corruption vulnerabilities in other software components and establish robust incident response procedures for handling potential exploitation attempts.