CVE-2024-30284: Adobe Acrobat DC RCE Vulnerability

CVE-2024-30284 Overview

CVE-2024-30284 is a Use After Free vulnerability affecting Adobe Acrobat Reader versions 20.005.30574, 24.002.20736 and earlier. This memory corruption flaw could allow an attacker to achieve arbitrary code execution in the context of the current user. Exploitation requires user interaction—specifically, the victim must open a maliciously crafted PDF file.

Critical Impact

Successful exploitation enables arbitrary code execution with current user privileges, potentially allowing attackers to install malware, steal sensitive data, or establish persistent access to compromised systems.

Affected Products

• Adobe Acrobat DC (Continuous track)
• Adobe Acrobat Reader DC (Continuous track)
• Adobe Acrobat (Classic track)
• Adobe Acrobat Reader (Classic track)
• Affected platforms: Microsoft Windows and Apple macOS

Discovery Timeline

• 2024-05-15 - CVE-2024-30284 published to NVD
• 2024-12-02 - Last updated in NVD database

Technical Details for CVE-2024-30284

Vulnerability Analysis

This Use After Free (CWE-416) vulnerability occurs when Adobe Acrobat Reader continues to reference memory after it has been freed. When a PDF document triggers specific operations that deallocate memory structures, subsequent code paths may attempt to access the freed memory region. If an attacker can control the contents of the reallocated memory, they can redirect execution flow and achieve arbitrary code execution.

The local attack vector with required user interaction means the vulnerability is exploited when a user opens a specially crafted PDF file. This is a common attack scenario for document-based exploitation, often delivered through phishing emails or malicious downloads.

Root Cause

The vulnerability stems from improper memory lifecycle management within Adobe Acrobat Reader's PDF parsing and rendering engine. Specifically, the application fails to properly invalidate references to memory objects after they have been deallocated. This creates a dangling pointer condition where the application may subsequently attempt to use the freed memory, leading to memory corruption that can be exploited for code execution.

Attack Vector

The attack requires a victim to open a maliciously crafted PDF file. An attacker would typically:

1. Create a specially crafted PDF document that triggers the Use After Free condition during parsing or rendering
2. Distribute the malicious PDF through phishing emails, compromised websites, or file-sharing platforms
3. When the victim opens the PDF with a vulnerable version of Adobe Acrobat Reader, the memory corruption occurs
4. The attacker gains code execution with the privileges of the current user, potentially leading to full system compromise

The vulnerability exploits the trust users place in PDF documents, which are commonly exchanged in business and personal communications. Since no additional privileges are required beyond what the current user possesses, the impact depends on the victim's access level within the organization.

Detection Methods for CVE-2024-30284

Indicators of Compromise

• Unexpected crashes or abnormal behavior when opening PDF documents in Adobe Acrobat Reader
• Process memory anomalies or suspicious memory allocation patterns in AcroRd32.exe or Acrobat.exe
• Unusual child processes spawned by Adobe Acrobat Reader applications
• Network connections initiated by Adobe Acrobat Reader to unexpected external hosts

Detection Strategies

• Monitor for suspicious PDF file downloads, especially from untrusted sources or email attachments
• Implement endpoint detection rules for Use After Free exploitation patterns targeting Adobe products
• Deploy application whitelisting to prevent unauthorized code execution from document readers
• Enable enhanced logging for Adobe Acrobat Reader process activity

Monitoring Recommendations

• Track Adobe Acrobat Reader version deployments across the enterprise to identify unpatched systems
• Monitor for behavioral anomalies in PDF reader processes, including unexpected DLL loads or API calls
• Implement network monitoring for outbound connections from Adobe Acrobat processes
• Review security logs for crash reports related to Adobe Acrobat Reader memory access violations

How to Mitigate CVE-2024-30284

Immediate Actions Required

• Update Adobe Acrobat Reader to the latest patched version immediately
• Implement Protected View mode in Adobe Acrobat Reader to reduce attack surface
• Block or quarantine suspicious PDF attachments at the email gateway level
• Educate users about the risks of opening PDF files from unknown or untrusted sources

Patch Information

Adobe has released security updates to address this vulnerability. Refer to Adobe Security Advisory APSB24-29 for detailed patch information and download links. Organizations should prioritize updating to versions newer than:

• Acrobat DC Continuous: 24.002.20736
• Acrobat 2020 Classic: 20.005.30574

Workarounds

• Enable Protected View for all PDF files from untrusted sources in Adobe Acrobat Reader preferences
• Disable JavaScript execution in PDF documents through Edit > Preferences > JavaScript
• Consider using alternative PDF readers temporarily until patches are deployed
• Implement application sandboxing or containerization for PDF document processing

# Registry configuration to enable Protected View (Windows)
reg add "HKCU\Software\Adobe\Acrobat Reader\DC\TrustManager" /v bEnhancedSecurityInBrowser /t REG_DWORD /d 1 /f
reg add "HKCU\Software\Adobe\Acrobat Reader\DC\TrustManager" /v bEnhancedSecurityStandalone /t REG_DWORD /d 1 /f