CVE-2011-2431 in Acrobat
Summary
by MITRE
Adobe Reader and Acrobat 8.x before 8.3.1, 9.x before 9.4.6, and 10.x before 10.1.1 allow attackers to execute arbitrary code via unspecified vectors, related to a "security bypass vulnerability."
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Analysis
by VulDB Data Team • 11/20/2021
Adobe Reader and Acrobat versions prior to the specified patches contain a critical security bypass vulnerability that enables remote attackers to execute arbitrary code on affected systems. This vulnerability affects multiple product versions including Adobe Reader 8.x before 8.3.1, 9.x before 9.4.6, and 10.x before 10.1.1, representing a significant risk to enterprise and individual users who rely on these PDF viewing applications. The unspecified nature of the attack vectors suggests that the vulnerability may be exploitable through multiple pathways including malicious PDF files, web-based attacks, or compromised documents that users might encounter during normal operation. This type of vulnerability falls under the CWE-284 access control weakness category, specifically related to improper access control mechanisms that allow unauthorized execution of code. The security bypass aspect indicates that the vulnerability circumvents existing security controls and protections that Adobe implemented to prevent malicious code execution, potentially allowing attackers to bypass sandboxing mechanisms or privilege restrictions that should normally protect the system.
The operational impact of this vulnerability extends beyond simple code execution to potentially compromise entire user environments and enable further attack progression. Attackers could leverage this vulnerability to install malware, steal sensitive data, or establish persistent access to compromised systems. The vulnerability's presence in widely deployed software means that exploitation could occur at scale, affecting both individual users and enterprise networks. Organizations that rely heavily on PDF document processing are particularly at risk since PDF files are commonly shared through email, web downloads, and document management systems. The vulnerability's classification as a security bypass aligns with ATT&CK technique T1059.007 for command and scripting interpreter, where attackers can execute malicious code through compromised applications. This vulnerability also represents a significant risk for phishing campaigns and social engineering attacks where malicious PDF documents serve as delivery mechanisms for more sophisticated attacks.
Mitigation strategies for this vulnerability require immediate patching of all affected Adobe Reader and Acrobat installations to the latest versions that contain the security fixes. System administrators should implement comprehensive patch management processes to ensure all endpoints receive updates promptly, particularly focusing on user workstations that process PDF documents. Network security controls such as PDF file scanning, content filtering, and web application firewalls can provide additional layers of protection while patches are being deployed. Organizations should also consider implementing application whitelisting policies that restrict execution of unauthorized code and limit the impact of potential exploitation. Security monitoring should include detection of suspicious PDF file access patterns and unusual system behavior that might indicate exploitation attempts. The vulnerability demonstrates the importance of maintaining current security patches and implementing defense-in-depth strategies to protect against zero-day exploits that can bypass traditional security controls. Regular security assessments and vulnerability scanning should be conducted to identify and remediate similar issues before they can be exploited by threat actors.