CVE-2009-2993 in Acrobat Reader
Summary
by MITRE
The JavaScript for Acrobat API in Adobe Reader and Acrobat 7.x before 7.1.4, 8.x before 8.1.7, and 9.x before 9.2 does not properly implement the (1) Privileged Context and (2) Safe Path restrictions for unspecified JavaScript methods, which allows remote attackers to create arbitrary files, and possibly execute arbitrary code, via the cPath parameter in a crafted PDF file. NOTE: some of these details are obtained from third party information.
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Analysis
by VulDB Data Team • 01/25/2025
The vulnerability identified as CVE-2009-2993 represents a critical security flaw in Adobe Reader and Acrobat software versions prior to specific patches. This issue affects the JavaScript for Acrobat API implementation where the software fails to properly enforce privileged context and safe path restrictions for unspecified JavaScript methods. The vulnerability exists across multiple product versions including Adobe Reader 7.x before 7.1.4, 8.x before 8.1.7, and 9.x before 9.2, indicating a widespread impact across the Adobe Acrobat ecosystem. The flaw allows remote attackers to exploit the system through maliciously crafted PDF files that contain specially designed JavaScript code.
The technical implementation of this vulnerability stems from improper enforcement of security boundaries within Adobe's JavaScript execution environment. When the cPath parameter is manipulated in a crafted PDF file, the JavaScript for Acrobat API fails to validate the path restrictions that should normally prevent arbitrary file creation and execution. This represents a classic privilege escalation issue where untrusted input from a PDF document can bypass normal security controls. The vulnerability specifically targets the privileged context mechanism that should normally restrict what operations JavaScript can perform, and the safe path restrictions that should prevent file system access outside designated areas. The lack of proper input validation and path sanitization creates a dangerous attack surface that allows attackers to manipulate the file system through JavaScript execution.
The operational impact of this vulnerability is severe and multifaceted. Remote attackers can leverage this flaw to create arbitrary files on the victim's system, potentially leading to persistent malware installation or data exfiltration. The possibility of arbitrary code execution makes this vulnerability particularly dangerous as it could allow full system compromise. Attackers can craft PDF documents that, when opened in vulnerable versions of Adobe Reader or Acrobat, automatically execute malicious code without user interaction. This makes the vulnerability particularly effective in phishing campaigns or targeted attacks where social engineering is not required. The attack vector through PDF files means that victims can be compromised simply by opening a malicious document, making this a significant threat in enterprise environments where PDF documents are commonly shared and opened.
This vulnerability maps to CWE-22 - Improper Limitation of a Pathname to a Restricted Directory, which specifically addresses path traversal and file system access control issues. The flaw also aligns with ATT&CK technique T1059.007 - Command and Scripting Interpreter: JavaScript, which describes how adversaries use JavaScript to execute malicious code. The improper implementation of privileged context restrictions directly relates to ATT&CK technique T1548.002 - Abuse Elevation Control Mechanism: Bypass User Account Control, as it allows bypassing normal file system access controls. Organizations should implement immediate mitigation strategies including updating to patched versions of Adobe Reader and Acrobat, implementing PDF content filtering, and restricting Adobe Reader functionality through registry modifications or group policies to disable JavaScript execution when possible.
The remediation approach requires organizations to prioritize patch management for Adobe Acrobat and Reader software, ensuring all systems are updated to versions 7.1.4, 8.1.7, or 9.2 respectively. Additional defensive measures include implementing content filtering solutions that can detect and block malicious PDF files, configuring Adobe Reader to disable JavaScript execution, and employing sandboxing technologies to isolate PDF processing. Network administrators should also consider implementing network-based intrusion detection systems that can identify suspicious PDF file patterns and monitor for exploitation attempts. The vulnerability highlights the critical importance of keeping enterprise software updated and maintaining robust security controls around document processing applications. Organizations should also conduct security awareness training to educate users about the risks of opening PDF files from untrusted sources and implement strict document approval processes for sensitive environments.