CVE-2021-44423 in Drawings Explorer
Summary
by MITRE • 12/21/2021
An out-of-bounds read vulnerability exists when reading a BMP file using Open Design Alliance (ODA) Drawings Explorer before 2022.12. The specific issue exists after loading BMP files. Unchecked input data from a crafted BMP file leads to an out-of-bounds read. An attacker can leverage this vulnerability to execute code in the context of the current process.
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Analysis
by VulDB Data Team • 12/25/2021
The vulnerability CVE-2021-44423 represents a critical out-of-bounds read flaw within Open Design Alliance Drawings Explorer software version prior to 2022.12. This security weakness specifically manifests when processing bitmap image files through the ODA library, creating a dangerous condition that can be exploited by malicious actors. The vulnerability stems from inadequate input validation mechanisms that fail to properly sanitize or verify the structure and content of BMP files before processing. When a maliciously crafted BMP file is loaded into the application, the software attempts to read memory locations beyond the allocated buffer boundaries, resulting in unpredictable behavior and potential code execution.
The technical exploitation of this vulnerability occurs through a combination of buffer overflow conditions and memory access violations that are characteristic of out-of-bounds read scenarios. This type of flaw falls under the CWE-125 category of Out-of-Bounds Read, which is classified as a fundamental memory safety issue in software development. The attack vector specifically targets the BMP file parsing functionality where the application does not adequately validate the file headers, pixel data structures, or metadata fields. When the application encounters malformed or specially crafted BMP file structures, it proceeds to access memory regions that were not intended for reading, potentially exposing sensitive memory contents or causing application crashes that can be leveraged for further exploitation.
The operational impact of this vulnerability extends beyond simple denial-of-service conditions, as it provides a pathway for remote code execution within the context of the current user process. This means that an attacker who successfully exploits this vulnerability can execute arbitrary code with the privileges of the user running the Drawings Explorer application. The implications are particularly severe in enterprise environments where design and engineering applications often run with elevated privileges or have access to sensitive project data. The vulnerability affects not only individual users but also organizations that rely on ODA Drawings Explorer for CAD document processing, potentially allowing attackers to gain unauthorized access to confidential design files, intellectual property, or system resources.
Mitigation strategies for CVE-2021-44423 should prioritize immediate software updates to version 2022.12 or later, which contain the necessary patches to address the buffer validation issues. Organizations should also implement network segmentation and access controls to limit exposure of vulnerable systems, particularly those handling CAD and design files. Additionally, input validation should be enhanced through the implementation of strict file format checking mechanisms and sandboxing techniques that isolate file processing operations. The ATT&CK framework categorizes this vulnerability under the T1059.007 technique for Windows Subsystem for Linux and similar process injection methods, making it particularly dangerous when combined with other exploitation techniques. Security monitoring should include detection of unusual file processing patterns and memory access violations that could indicate exploitation attempts, while regular security assessments should verify that all ODA components are properly updated and patched against known vulnerabilities.