CVE-2011-2099 in Acrobat
Summary
by MITRE
Adobe Reader and Acrobat 8.x before 8.3, 9.x before 9.4.5, and 10.x before 10.1 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-2011-2098.
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Analysis
by VulDB Data Team • 10/17/2018
Adobe Reader and Acrobat versions prior to 8.3, 9.4.5, and 10.1 contain a critical memory corruption vulnerability that enables remote code execution and denial of service attacks. This vulnerability affects both Windows and Mac OS X operating systems and represents a distinct security flaw from CVE-2011-2098, indicating separate attack vectors and exploitation mechanisms. The unspecified nature of the attack vectors suggests multiple potential entry points within the software's processing functions, likely involving memory handling routines that fail to properly validate input data. The vulnerability stems from inadequate memory management practices within the PDF parsing and rendering components of Adobe's document processing engine, creating opportunities for attackers to craft malicious PDF files that trigger buffer overflows or other memory corruption conditions when processed by the affected software versions.
The technical implementation of this vulnerability demonstrates weaknesses in Adobe's memory handling and input validation mechanisms, which fall under the CWE-125 vulnerability category for out-of-bounds read conditions and potentially CWE-787 for out-of-bounds write operations. Attackers can exploit this flaw by crafting specially designed PDF documents that, when opened or processed by vulnerable Adobe Reader or Acrobat installations, cause memory corruption that can be leveraged to execute arbitrary code with the privileges of the affected user. The memory corruption occurs during the parsing or rendering of PDF content, particularly when handling malformed or maliciously constructed PDF objects, streams, or embedded content that exceeds expected memory boundaries. This type of vulnerability aligns with ATT&CK technique T1203 for Exploitation for Client Execution, where adversaries leverage vulnerabilities in software applications to execute malicious code on target systems.
The operational impact of CVE-2011-2099 extends beyond simple denial of service scenarios to encompass full system compromise capabilities, making it a severe threat to enterprise and individual users alike. Organizations relying on Adobe Reader for document viewing and processing face significant risk exposure, as the vulnerability can be exploited through email attachments, web downloads, or any mechanism that delivers malicious PDF content to vulnerable systems. The widespread deployment of Adobe Reader across enterprise environments means that successful exploitation can result in unauthorized access to sensitive data, privilege escalation, and potential lateral movement within network infrastructures. The vulnerability's presence in multiple version ranges indicates a long-standing issue that required multiple patches to address, emphasizing the need for regular security updates and patch management processes. Security professionals should consider this vulnerability when conducting risk assessments for legacy software environments, particularly those that cannot immediately migrate to newer versions due to compatibility requirements or organizational constraints.
Organizations should implement immediate mitigation strategies including mandatory security updates to the latest Adobe Reader and Acrobat versions, network-based protections such as web application firewalls that can detect and block malicious PDF content, and user education regarding safe document handling practices. System administrators should also consider implementing sandboxing techniques and privilege separation to limit the potential damage from successful exploitation attempts. The vulnerability serves as a reminder of the critical importance of maintaining current security patches for widely used software applications, as the attack surface for such vulnerabilities remains extensive due to the ubiquitous nature of PDF document processing across both personal and enterprise computing environments.