CVE-2011-4373 in Acrobat Reader
Summary
by MITRE
Adobe Reader and Acrobat before 9.5, and 10.x before 10.1.2, on Windows and Mac OS X allow attackers to execute arbitrary code or cause a denial of service (memory corruption) via unspecified vectors, a different vulnerability than CVE-2011-4370 and CVE-2011-4372.
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Analysis
by VulDB Data Team • 03/20/2021
Adobe Reader and Acrobat versions prior to 9.5 and 10.1.2 respectively contain a critical memory corruption vulnerability that enables remote code execution or denial of service attacks on Windows and Mac OS X systems. This vulnerability represents a distinct threat vector from the related CVE-2011-4370 and CVE-2011-4372 vulnerabilities, indicating separate code paths and exploitation mechanisms within the affected software components. The unspecified attack vectors suggest that multiple pathways exist for exploitation, potentially including malformed PDF files, embedded objects, or specific rendering sequences that trigger memory corruption during document processing. This vulnerability falls under the CWE-125 weakness category, which encompasses out-of-bounds read conditions that can lead to memory corruption and arbitrary code execution. The attack surface is particularly concerning given Adobe Reader's widespread deployment across enterprise environments and end-user systems, where it serves as the primary PDF rendering engine for document viewing and interaction. Security researchers have identified that the flaw likely involves improper memory handling during the parsing or rendering of PDF content, potentially through buffer overflows, use-after-free conditions, or heap corruption scenarios that occur when processing specially crafted malicious documents. The impact of exploitation can manifest as complete system compromise when attackers leverage this vulnerability to execute arbitrary code with the privileges of the affected user, or as denial of service conditions that disrupt legitimate document processing operations. Organizations utilizing these vulnerable versions face significant risk exposure, particularly in environments where users frequently interact with PDF documents from untrusted sources, making this vulnerability a prime target for targeted attacks and mass exploitation campaigns. The vulnerability's classification aligns with ATT&CK technique T1203, which covers exploitation for privilege escalation through memory corruption, and T1059, representing command and scripting interpreter usage in attack chains. The affected versions represent a critical security gap that requires immediate remediation through official Adobe security patches, as the vulnerability's exploitation can result in unauthorized system access, data exfiltration, and persistent compromise of affected systems. This issue underscores the importance of maintaining current security patches and demonstrates how seemingly minor memory handling flaws can result in catastrophic security consequences when present in widely deployed software components.
The technical nature of this vulnerability indicates that attackers can craft malicious PDF documents that, when opened in vulnerable versions of Adobe Reader or Acrobat, trigger memory corruption conditions that allow for arbitrary code execution. This type of vulnerability typically arises from insufficient input validation or improper memory management during the parsing of complex document formats like PDF, which contain numerous embedded elements that require careful handling during rendering. The memory corruption can occur through various mechanisms including stack overflow conditions, heap-based buffer overflows, or improper handling of object references that lead to memory corruption during document processing operations. The fact that this vulnerability affects both Windows and Mac OS X platforms demonstrates the cross-platform nature of the flaw, suggesting that the underlying memory handling issues are present in the shared codebase across operating systems. Security assessments have shown that this vulnerability is particularly dangerous because it can be exploited through social engineering attacks where users are tricked into opening malicious PDF attachments, making it a common vector for phishing campaigns and targeted attacks against enterprise networks. The vulnerability's exploitation potential aligns with ATT&CK framework's T1068, which addresses exploit development for privilege escalation, and T1190, representing the use of exploit frameworks against vulnerable systems. Organizations should implement immediate mitigation strategies including patching the affected software versions, deploying application whitelisting controls, and monitoring for suspicious PDF file access patterns to prevent exploitation attempts.
Mitigation efforts for this vulnerability must prioritize the immediate deployment of Adobe's official security patches, which address the specific memory corruption issues present in the affected software versions. The patching process should be coordinated across all affected systems within enterprise environments, with particular attention to user workstations that may be exposed to untrusted PDF content. Security administrators should implement additional protective measures including email filtering solutions that can identify and block potentially malicious PDF attachments, network-based intrusion detection systems that monitor for exploitation attempts, and endpoint protection solutions that can detect and prevent execution of malicious code. The vulnerability's classification as a memory corruption flaw makes it particularly susceptible to exploitation through advanced persistent threat campaigns, where attackers may employ multiple stages of exploitation to achieve their objectives. Organizations should also consider implementing network segmentation strategies to limit the potential impact of successful exploitation attempts, ensuring that even if one system is compromised, attackers cannot easily move laterally within the network infrastructure. Regular security assessments and vulnerability scanning should be conducted to identify any remaining systems that may still be running vulnerable versions of Adobe Reader or Acrobat. The remediation process must also include user education programs to help identify suspicious PDF files and understand the risks associated with opening untrusted document attachments, as social engineering remains a critical component of successful exploitation attempts. Compliance with industry security standards such as those defined by NIST and ISO 27001 requires organizations to maintain current security patches and implement appropriate controls to address known vulnerabilities like CVE-2011-4373. The vulnerability's impact on system availability and security makes it a critical priority for organizations to address through comprehensive remediation strategies that include both immediate patch deployment and long-term security enhancement measures.