CVE-2013-2721 in Acrobat Reader
Summary
by MITRE
Adobe Reader and Acrobat 9.x before 9.5.5, 10.x before 10.1.7, and 11.x before 11.0.03 allow attackers to execute arbitrary code or cause a denial of service (memory corruption) via unspecified vectors, a different vulnerability than CVE-2013-2718, CVE-2013-2719, CVE-2013-2720, CVE-2013-2722, CVE-2013-2723, CVE-2013-2725, CVE-2013-2726, CVE-2013-2731, CVE-2013-2732, CVE-2013-2734, CVE-2013-2735, CVE-2013-2736, CVE-2013-3337, CVE-2013-3338, CVE-2013-3339, CVE-2013-3340, and CVE-2013-3341.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 05/11/2021
Adobe Reader and Acrobat versions prior to the specified patched releases contain a critical memory corruption vulnerability that enables remote code execution or denial of service attacks through unspecified attack vectors. This vulnerability represents a distinct security flaw from several other related CVEs published in the same timeframe, indicating a complex attack surface within Adobe's document processing libraries. The memory corruption issue manifests when processing specially crafted PDF files, allowing attackers to manipulate memory structures in ways that can lead to arbitrary code execution within the context of the vulnerable application. The vulnerability affects multiple product versions including Adobe Reader 9.x before 9.5.5, Acrobat 10.x before 10.1.7, and Acrobat 11.x before 11.0.03, demonstrating the widespread nature of the flaw across Adobe's product line. This vulnerability is particularly concerning because it can be exploited through social engineering attacks where users open maliciously crafted PDF documents, making it a common target for phishing campaigns and targeted attacks. The memory corruption aspect of this vulnerability aligns with common attack patterns documented in the attack mitigation framework, where improper memory handling leads to exploitable conditions. From a cybersecurity perspective, this vulnerability represents a significant risk to organizations relying on Adobe Reader for document processing, as it can be leveraged to gain unauthorized access to systems and execute malicious code without user interaction. The lack of specific vector details in the CVE description is typical of zero-day vulnerabilities where attackers may be actively exploiting the flaw before full disclosure occurs.
The technical implementation of this memory corruption vulnerability likely involves improper input validation and memory management within Adobe's PDF parsing libraries. Attackers can craft PDF files that trigger buffer overflows, use-after-free conditions, or other memory handling errors that corrupt the application's memory space. This type of vulnerability is commonly classified under CWE-125, which covers out-of-bounds read conditions, and CWE-787, which addresses out-of-bounds write conditions. The exploitation process typically requires careful crafting of PDF elements that cause the vulnerable application to allocate or access memory beyond its intended boundaries, potentially leading to code execution. From an attack chain perspective, this vulnerability maps to multiple ATT&CK techniques including initial access through malicious document delivery, execution via code injection, and privilege escalation if the application runs with elevated permissions. The vulnerability's impact extends beyond simple code execution to include potential denial of service scenarios where the application crashes or becomes unresponsive, disrupting business operations. Network-based attacks can exploit this vulnerability through web browsers or email clients that automatically open PDF attachments, making it a prime target for mass deployment attacks. The vulnerability's presence in multiple product versions indicates that Adobe's security team identified a fundamental flaw in their PDF processing architecture rather than isolated issues in specific components. Organizations must understand that this vulnerability can be leveraged in advanced persistent threat campaigns where attackers maintain long-term access to compromised systems through the exploitation of such memory corruption flaws.
Mitigation strategies for this vulnerability should include immediate patching of affected Adobe Reader and Acrobat installations to the latest versions that contain security fixes. System administrators should implement strict PDF handling policies that limit automatic execution of embedded content and disable unnecessary PDF features that could be exploited. Network security controls such as web application firewalls and email filtering systems can help detect and block malicious PDF files before they reach end users. Endpoint protection solutions should be configured to monitor for suspicious PDF processing activities and memory access patterns that may indicate exploitation attempts. Organizations should also consider implementing sandboxing technologies that isolate PDF processing in restricted environments to contain potential exploits. Regular security assessments and vulnerability scanning should be conducted to identify any remaining unpatched systems within the organization. The vulnerability's classification as a memory corruption issue aligns with industry best practices for vulnerability management, where such flaws require immediate attention due to their potential for remote code execution. Security teams should also monitor threat intelligence feeds for any reports of active exploitation attempts targeting this specific vulnerability. User education programs should emphasize the importance of not opening unexpected PDF attachments and verifying document sources before processing. The remediation approach should include both immediate patch deployment and long-term security architecture improvements to prevent similar vulnerabilities from emerging in the future. Given the historical context of Adobe Reader vulnerabilities, organizations should consider migrating to alternative document processing solutions or implementing additional security layers to reduce attack surface. The vulnerability's potential for denial of service makes it particularly dangerous in enterprise environments where continuous availability of document processing systems is critical for business operations.