CVE-2022-38437 in Acrobat Reader
Summary
by MITRE • 10/15/2022
Adobe Acrobat Reader versions 22.002.20212 (and earlier) and 20.005.30381 (and earlier) are affected by a Use After Free vulnerability that could lead to disclosure of sensitive memory. An attacker could leverage this vulnerability to bypass mitigations such as ASLR. 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 • 11/09/2022
The vulnerability identified as CVE-2022-38437 represents a critical use after free flaw in Adobe Acrobat Reader affecting multiple version ranges including 22.002.20212 and earlier, as well as 20.005.30381 and earlier. This type of vulnerability occurs when a program continues to reference memory after it has been freed, creating a dangerous condition that can be exploited by malicious actors. The flaw specifically impacts the memory management functions within the PDF rendering engine of Adobe Acrobat Reader, where improper handling of memory allocation and deallocation creates opportunities for attackers to manipulate program execution flow.
The technical nature of this vulnerability aligns with CWE-416 which defines use after free conditions as a common security flaw where memory is accessed after it has been freed by the program. This particular issue manifests in the context of Adobe Acrobat Reader's handling of PDF objects, where a crafted malicious file can trigger improper memory management that allows for arbitrary code execution. The vulnerability's impact extends beyond simple code execution as it specifically enables attackers to bypass critical security mitigations such as Address Space Layout Randomization, which is designed to prevent attackers from predicting memory locations for exploitation purposes. This bypass capability significantly increases the exploitability and effectiveness of attacks against vulnerable systems.
The operational impact of CVE-2022-38437 requires specific user interaction to be exploited, meaning victims must actively open a maliciously crafted PDF file for the attack to succeed. This user interaction requirement provides a natural defense mechanism but also highlights the social engineering component that attackers must employ to compromise systems. The vulnerability's exploitation potential creates serious security implications for organizations that rely heavily on PDF document processing, as it could enable attackers to gain unauthorized access to sensitive information, execute malicious code, or establish persistent access to target systems. The fact that this affects widely used software versions makes the vulnerability particularly concerning for enterprise environments where Acrobat Reader is commonly deployed.
Mitigation strategies for CVE-2022-38437 should prioritize immediate patch deployment from Adobe, as the vendor has released security updates addressing this specific vulnerability. Organizations should implement layered security controls including email filtering to prevent malicious PDF attachments from reaching users, application whitelisting to restrict execution of unauthorized PDF viewers, and regular security awareness training to educate users about identifying potentially malicious documents. Network-based protections such as web application firewalls and content inspection systems can provide additional defense in depth. The vulnerability's classification under ATT&CK technique T1203 (Exploitation for Client Execution) emphasizes the importance of endpoint protection measures and regular vulnerability scanning to identify systems running vulnerable versions of Adobe Acrobat Reader. Security teams should also consider implementing monitoring for suspicious PDF file access patterns and ensure comprehensive incident response procedures are in place to address potential exploitation attempts.