CVE-2021-44422 in Drawings
Summary
by MITRE • 12/21/2021
An Improper Input Validation Vulnerability exists when reading a BMP file using Open Design Alliance Drawings SDK before 2022.12. Crafted data in a BMP file can trigger a write operation past the end of an allocated buffer, or lead to a heap-based buffer overflow. 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 identified as CVE-2021-44422 represents a critical improper input validation flaw within the Open Design Alliance Drawings SDK version 2022.12 and earlier. This issue specifically manifests when processing Bitmap (.bmp) image files, exposing systems to potential exploitation through malformed input data. The vulnerability stems from inadequate validation of input parameters during the parsing of BMP file structures, creating a scenario where crafted malicious data can manipulate memory operations beyond their intended boundaries. The flaw is classified under CWE-121 as a stack-based buffer overflow, though it manifests in heap memory operations due to the nature of the SDK's memory management during file processing. This vulnerability directly impacts the security posture of systems that utilize the Open Design Alliance Drawings SDK for handling bitmap image files, particularly in environments where untrusted input is processed without proper sanitization.
The technical exploitation of this vulnerability occurs through the manipulation of BMP file headers and data structures to trigger a heap-based buffer overflow condition. When the SDK attempts to parse a malformed BMP file, the input validation mechanisms fail to properly check the size parameters within the file structure, leading to a situation where memory allocation occurs based on manipulated values. This allows an attacker to write data beyond the boundaries of allocated heap memory regions, potentially overwriting adjacent memory structures including function pointers, return addresses, or other critical program data. The buffer overflow creates an opportunity for arbitrary code execution within the context of the current process, effectively allowing an attacker to gain control over the application's execution flow and potentially escalate privileges. The vulnerability's exploitation requires careful crafting of the BMP file structure to ensure that the overflow occurs in a manner that can be controlled to redirect program execution.
The operational impact of CVE-2021-44422 extends beyond simple code execution, as it represents a significant threat vector for attackers seeking to compromise systems that process BMP files through the affected SDK. Systems utilizing the Open Design Alliance Drawings SDK in applications such as CAD software, document management systems, or any platform that handles bitmap image processing become vulnerable to remote code execution attacks. The vulnerability's potential for exploitation is particularly concerning in enterprise environments where users may unknowingly open maliciously crafted BMP files, leading to unauthorized access to sensitive systems. Attackers can leverage this flaw through various attack vectors including email attachments, web downloads, or file sharing platforms where BMP files are commonly used. The impact is compounded by the fact that the vulnerability affects multiple applications that depend on the SDK, creating a widespread potential attack surface across different software implementations.
Mitigation strategies for CVE-2021-44422 primarily focus on immediate software updates and implementation of defensive programming practices. The most effective remediation involves upgrading to Open Design Alliance Drawings SDK version 2022.12 or later, which includes proper input validation mechanisms and memory boundary checks. Organizations should also implement strict input validation policies for all image file processing operations, including the use of sandboxed environments when handling untrusted file inputs. Network segmentation and access controls can help limit the potential impact of successful exploitation attempts, while application whitelisting can prevent unauthorized applications from processing BMP files. Additionally, security monitoring should be enhanced to detect unusual file processing patterns or memory allocation behaviors that might indicate exploitation attempts. The vulnerability's classification under ATT&CK technique T1203 (Exploitation for Client Execution) emphasizes the need for comprehensive endpoint protection measures including behavioral monitoring and exploit prevention technologies. Regular security assessments of applications utilizing the SDK should be conducted to ensure proper implementation of secure coding practices and to identify potential similar vulnerabilities in other components of the software stack.