CVE-2011-4372 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-2011-4373.
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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 and denial of service attacks on both Windows and Mac OS X platforms. This vulnerability represents a distinct threat vector from the closely related CVE-2011-4370 and CVE-2011-4373, indicating multiple attack surfaces within the Adobe Acrobat ecosystem. The flaw manifests through unspecified vectors that likely involve improper memory handling during document processing, potentially exploiting buffer overflows or use-after-free conditions that occur when parsing maliciously crafted PDF files. Such vulnerabilities fall under the CWE-125 weakness category, which encompasses out-of-bounds read conditions, and may also align with CWE-787 for out-of-bounds writes. The attack surface extends beyond simple exploitation to include sophisticated attack techniques that leverage the Adobe Acrobat runtime environment, making this vulnerability particularly dangerous in enterprise settings where PDF documents are frequently processed. The memory corruption aspect of this vulnerability allows attackers to manipulate heap memory structures, potentially leading to arbitrary code execution with the privileges of the affected user. This type of vulnerability directly maps to ATT&CK technique T1203, which covers exploitation for privilege escalation through memory corruption attacks. The impact of this vulnerability extends to both denial of service scenarios where legitimate users cannot access PDF documents and more severe cases where attackers can execute malicious code on target systems. The vulnerability affects widely deployed software across multiple operating systems, making it a prime target for attackers seeking to compromise endpoints through social engineering campaigns that deliver malicious PDF files. The vulnerability's presence in both Windows and Mac OS X environments indicates that the underlying memory management flaw exists across the Adobe Acrobat platform architecture, suggesting a systemic issue rather than isolated component failure.
The technical implementation of this vulnerability likely involves improper handling of PDF objects, streams, or cross-reference tables during parsing operations. When Adobe Reader or Acrobat processes malicious PDF content, the application may attempt to allocate memory for document elements without proper bounds checking, leading to memory corruption that can be exploited to overwrite critical memory locations. This type of vulnerability typically requires specific conditions to be met, including the presence of certain PDF structures or encoding that triggers the flawed memory handling code path. The exploitation process would likely involve crafting a PDF file that, when opened, causes the application to execute malicious code through memory corruption techniques such as return-oriented programming or direct code injection. The vulnerability's classification as a memory corruption issue places it within the broader category of heap-based buffer overflow attacks that have been prevalent in Adobe's product line. These types of vulnerabilities often require attackers to understand the specific memory layout and application behavior to successfully exploit the flaw. The lack of specific vector details in the CVE description suggests that the vulnerability may involve multiple attack paths or that the exact conditions for exploitation are complex enough to warrant further analysis. The vulnerability's impact on both Windows and Mac OS X systems indicates that the underlying memory corruption issue exists in the shared codebase between platforms, making the exploitation potential more widespread and predictable.
Mitigation strategies for this vulnerability require immediate patch application as the primary defense mechanism, with system administrators prioritizing the deployment of Adobe Acrobat updates to versions 9.5 and 10.1.2 respectively. Organizations should implement comprehensive network security controls including PDF file filtering and sandboxing mechanisms to prevent potentially malicious documents from reaching end users. The vulnerability's nature as a memory corruption flaw makes traditional signature-based detection methods less effective, requiring organizations to adopt more sophisticated behavioral analysis approaches. Security teams should monitor for exploitation attempts through network traffic analysis and endpoint detection systems that can identify anomalous PDF processing behavior. The vulnerability's potential for privilege escalation makes it particularly dangerous in enterprise environments where users may have elevated privileges when opening PDF documents. Network segmentation and user access controls should be implemented to limit the potential impact of successful exploitation attempts. Organizations should also consider implementing application whitelisting policies that restrict PDF processing to trusted applications, reducing the attack surface for this type of vulnerability. The vulnerability's presence across multiple platforms necessitates a coordinated patching approach that accounts for different operating system environments and their specific security configurations. Regular security assessments and vulnerability scanning should be conducted to identify systems that may have been missed during initial patch deployment, ensuring comprehensive coverage of all affected Adobe Acrobat installations.