CVE-2011-2435 in Acrobat
Summary
by MITRE
Buffer overflow in Adobe Reader and Acrobat 8.x before 8.3.1, 9.x before 9.4.6, and 10.x before 10.1.1 allows attackers to execute arbitrary code via unspecified vectors.
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Analysis
by VulDB Data Team • 11/20/2021
The vulnerability identified as CVE-2011-2435 represents a critical buffer overflow flaw affecting Adobe Reader and Acrobat software across multiple versions including 8.x before 8.3.1, 9.x before 9.4.6, and 10.x before 10.1.1. This vulnerability falls under the CWE-121 category of stack-based buffer overflow, where insufficient bounds checking allows attackers to write beyond allocated memory boundaries. The flaw manifests in the handling of malformed input data within the PDF processing engine, creating opportunities for malicious code execution. The unspecified vectors suggest that the attack could occur through various means such as crafted PDF files, embedded objects, or malformed data streams that trigger the vulnerable code path during document parsing operations.
The technical implementation of this buffer overflow leverages the inherent weaknesses in memory management within Adobe's PDF rendering components. When processing specially crafted PDF documents, the application fails to properly validate input lengths against allocated buffer sizes, allowing attackers to overwrite adjacent memory locations. This memory corruption can potentially overwrite return addresses, function pointers, or other critical control data structures, enabling attackers to redirect program execution flow. The vulnerability is particularly dangerous because it operates at the application level within the PDF processing pipeline, making it accessible through standard document opening procedures that users commonly perform without security awareness.
The operational impact of CVE-2011-2435 extends significantly beyond simple code execution capabilities, as it provides attackers with persistent access to target systems through the Adobe Reader application. This vulnerability aligns with ATT&CK technique T1059.007 for command and script interpreter execution, enabling adversaries to establish persistent backdoors or deploy additional malware payloads. The widespread adoption of Adobe Reader across enterprise environments amplifies the potential impact, as successful exploitation can compromise multiple systems within a network. Organizations utilizing these vulnerable versions face heightened risk of data breaches, system compromise, and potential lateral movement within their infrastructure. The vulnerability's exploitation typically requires user interaction through opening malicious PDF documents, making social engineering attacks particularly effective in combination with this technical flaw.
Mitigation strategies for CVE-2011-2435 should prioritize immediate software updates to patched versions of Adobe Reader and Acrobat, as this represents the most effective defense against exploitation. Organizations should implement strict document handling policies that restrict PDF file access from untrusted sources and deploy sandboxing technologies to isolate PDF processing activities. Network-based security controls including intrusion detection systems and web application firewalls can help detect and block malicious PDF content attempts. Additionally, security awareness training should emphasize the dangers of opening unexpected PDF attachments, while endpoint protection solutions should be configured to monitor for suspicious process behaviors and memory access patterns. The vulnerability demonstrates the importance of maintaining up-to-date software patches and implementing defense-in-depth strategies that protect against both known and emerging threats in the cybersecurity landscape.