CVE-2008-2042 in Acrobat Reader
Summary
by MITRE
The Javascript API in Adobe Acrobat Professional 7.0.9 and possibly 8.1.1 exposes a dangerous method, which allows remote attackers to execute arbitrary commands or trigger a buffer overflow via a crafted PDF file that invokes app.checkForUpdate with a malicious callback function.
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Analysis
by VulDB Data Team • 07/31/2021
The vulnerability identified as CVE-2008-2042 represents a critical security flaw in Adobe Acrobat Professional versions 7.0.9 and potentially 8.1.1 that stems from improper input validation within the JavaScript API. This vulnerability exists within the app.checkForUpdate method which is designed to check for software updates but becomes exploitable when malicious code is injected through crafted PDF files. The flaw allows remote attackers to execute arbitrary commands on affected systems by leveraging the dangerous callback function mechanism that the JavaScript API provides. The vulnerability operates at the application layer and demonstrates a classic buffer overflow condition that can be triggered through improper handling of user-supplied data within the Acrobat JavaScript engine.
The technical implementation of this vulnerability involves the exploitation of the JavaScript API's callback functionality where the app.checkForUpdate method accepts parameters that are not properly sanitized or validated. When a malicious PDF file is opened, the JavaScript code within the document can invoke this method with crafted parameters that cause the Acrobat application to execute unintended code sequences. The vulnerability specifically targets the buffer management within the JavaScript execution environment, where insufficient bounds checking allows attackers to overwrite memory regions and potentially execute arbitrary code with the privileges of the Acrobat application. This flaw falls under the CWE-121 category of stack-based buffer overflow and aligns with ATT&CK technique T1059.007 for JavaScript-based execution.
The operational impact of CVE-2008-2042 is severe and affects organizations that rely on Adobe Acrobat for document processing and viewing. Attackers can leverage this vulnerability to gain unauthorized code execution capabilities on target systems, potentially leading to complete system compromise. The remote exploitation nature means that users can be compromised simply by opening a malicious PDF file, making this vulnerability particularly dangerous in enterprise environments where document sharing is common. The attack vector involves social engineering through phishing campaigns or malicious file distribution, where users unknowingly execute the malicious code contained within the PDF. Organizations with outdated Acrobat installations remain at risk, as this vulnerability affects multiple versions within the 7.x and 8.x release lines.
Mitigation strategies for this vulnerability require immediate patching of affected Adobe Acrobat versions to the latest security updates provided by Adobe. System administrators should implement strict document validation policies and consider deploying sandboxing solutions for PDF processing to isolate potentially malicious content. Network-level controls such as PDF content filtering and email scanning should be implemented to prevent malicious PDF files from reaching end users. Additionally, user education programs should emphasize the dangers of opening untrusted PDF documents and the importance of keeping software updated. The vulnerability demonstrates the importance of proper input validation and secure coding practices within application programming interfaces, particularly those exposed to user-supplied data. Organizations should also consider implementing privileged access controls and monitoring for suspicious JavaScript execution patterns within their Acrobat environments to detect potential exploitation attempts.