CVE-2024-20728 in Acrobat 2020
Summary
by MITRE • 02/15/2024
Acrobat Reader versions 20.005.30539, 23.008.20470 and earlier are affected by an out-of-bounds write vulnerability that could result in arbitrary code execution in the context of the current user. Exploitation of this issue requires user interaction in that a victim must open a malicious file.
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Analysis
by VulDB Data Team • 02/15/2024
This vulnerability represents a critical out-of-bounds write flaw in Adobe Acrobat Reader affecting multiple version ranges including 20.005.30539, 23.008.20470 and earlier releases. The technical nature of this vulnerability falls under the category of memory corruption issues that can lead to arbitrary code execution when exploited successfully. The flaw occurs within the PDF parsing functionality where improper bounds checking allows an attacker to write data beyond allocated memory regions. This type of vulnerability is particularly dangerous as it can be leveraged to execute malicious code with the privileges of the currently logged-in user, potentially leading to complete system compromise.
The exploitation vector requires social engineering through user interaction since victims must voluntarily open a specially crafted malicious file. This characteristic places the vulnerability within the realm of targeted attacks where attackers craft convincing phishing emails or distribute infected documents through various channels. The attack chain typically begins with the delivery of a malicious PDF document that, when opened by an unpatched Acrobat Reader instance, triggers the out-of-bounds write condition. This scenario aligns with common threat actor methodologies documented in frameworks such as attack trees and adversary tactics, where initial access is achieved through user interaction to bypass traditional network-based defenses.
From a cybersecurity perspective, this vulnerability demonstrates the persistent challenge of securing document processing applications that must handle complex file formats with extensive functionality. The issue is classified as a CWE-787 Out-of-bounds Write according to the Common Weakness Enumeration catalog, which specifically addresses memory safety problems in software implementations. The operational impact extends beyond individual user compromise to potentially affect enterprise environments where Acrobat Reader is widely deployed for document management and collaboration workflows. Organizations that rely heavily on PDF processing for business operations face significant risk exposure since patch deployment may be delayed or incomplete across large user bases.
Security professionals should implement layered mitigation strategies including immediate patching of affected versions, deployment of email filtering solutions to identify potentially malicious attachments, and user education programs focused on recognizing suspicious document files. Network segmentation and application whitelisting can provide additional defense-in-depth measures while monitoring for anomalous PDF processing activities. The vulnerability highlights the importance of maintaining current software patches and implementing automated update mechanisms for widely used applications that process untrusted content. Organizations should also consider deploying sandboxing technologies for PDF handling to isolate potentially malicious documents from core operating system resources, as recommended in various cybersecurity frameworks including nist 800-171 and iso 27001 compliance standards.