CVE-2022-34217 in Acrobat Reader
Summary
by MITRE • 07/15/2022
Adobe Acrobat Reader versions 22.001.20142 (and earlier), 20.005.30334 (and earlier) and 17.012.30229 (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.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 08/01/2022
The vulnerability identified as CVE-2022-34217 represents a critical out-of-bounds write flaw within Adobe Acrobat Reader applications across multiple version ranges including 22.001.20142 and earlier, 20.005.30334 and earlier, and 17.012.30229 and earlier. This type of vulnerability falls under the Common Weakness Enumeration category CWE-787, which specifically addresses out-of-bounds write conditions that can lead to memory corruption and arbitrary code execution. The flaw exists in the document parsing functionality of Acrobat Reader, where improper bounds checking allows attackers to write data beyond the allocated memory boundaries. Such vulnerabilities are particularly dangerous because they can be exploited to overwrite critical memory locations including function pointers, return addresses, or other control data structures that govern program execution flow.
The exploitation of this vulnerability requires user interaction through social engineering techniques where victims must open a maliciously crafted PDF file. This attack vector aligns with the ATT&CK framework's technique T1203, which involves gaining access through the execution of malicious code via user interaction. The attack begins when a user opens a specially crafted PDF document that contains malformed data structures designed to trigger the out-of-bounds write condition. When the reader processes this malformed data, it writes beyond the intended memory boundaries, potentially overwriting critical program execution elements. The attacker can leverage this memory corruption to redirect program execution to malicious code, effectively achieving arbitrary code execution in the context of the current user account.
The operational impact of this vulnerability extends beyond simple exploitation as it represents a significant risk to enterprise security environments where Acrobat Reader is widely deployed. Organizations using these vulnerable versions face potential compromise through targeted attacks that could lead to data exfiltration, lateral movement, or persistent access within network perimeters. The vulnerability affects users across multiple operating systems including Windows, macOS, and Linux platforms where Adobe Reader is installed, making it a broad attack surface. Security teams must consider the implications of this flaw in their incident response planning, as exploitation could result in full system compromise if the user has elevated privileges. The vulnerability's reliance on user interaction creates a challenge for automated defense mechanisms, requiring user education and awareness programs alongside technical mitigations.
Mitigation strategies for CVE-2022-34217 should prioritize immediate patching of all affected Adobe Acrobat Reader installations to the latest secure versions. Organizations should implement network-based controls such as PDF file filtering at perimeter defenses to block potentially malicious documents before they reach end users. The principle of least privilege should be enforced where possible, limiting user permissions to reduce potential impact from successful exploitation. Security monitoring should include detection of unusual PDF processing activities and memory access patterns that might indicate exploitation attempts. Additionally, regular vulnerability assessments should verify that all Acrobat Reader installations across the enterprise are patched and that no legacy versions remain in use. Implementation of endpoint protection solutions with behavioral monitoring capabilities can provide additional defense layers against exploitation attempts. Organizations should also consider implementing zero-trust network access controls that require verification of all file downloads and processing activities regardless of user credentials or network location.