CVE-2023-0973 in STEPTools
Summary
by MITRE • 03/13/2023
STEPTools v18SP1 ifcmesh library (v18.1) is affected due to a null pointer dereference, which could allow an attacker to deny application usage when reading a specially constructed file, resulting in an application crash.
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Analysis
by VulDB Data Team • 04/02/2023
The vulnerability identified as CVE-2023-0973 affects the STEPTools v18SP1 ifcmesh library version 18.1, representing a critical null pointer dereference flaw that fundamentally compromises application stability and availability. This issue resides within the file parsing functionality of the library, specifically when processing specially crafted input files that trigger improper memory handling during the reading process. The vulnerability stems from inadequate input validation and error handling mechanisms within the library's mesh processing routines, where the code fails to properly check for null references before attempting to access memory locations. Such a flaw creates a predictable crash condition that can be reliably exploited by attackers who understand the library's parsing behavior and can construct malicious files that trigger the problematic execution path.
The technical exploitation of this vulnerability occurs when an application utilizing the ifcmesh library attempts to read a malformed file that contains specific patterns or structures designed to cause the library to dereference a null pointer during mesh data processing. This type of flaw falls under CWE-476, which specifically addresses null pointer dereference conditions in software systems. The attack vector is particularly concerning because it requires no elevated privileges or complex exploitation techniques, making it accessible to adversaries with basic knowledge of the library's behavior. When the vulnerable code path executes, it results in an immediate application crash that terminates the process and renders the application unavailable to legitimate users, effectively creating a denial of service condition that can be triggered remotely through file upload mechanisms or when processing untrusted input data.
The operational impact of CVE-2023-0973 extends beyond simple application crashes to encompass broader system availability and reliability concerns within environments that depend on STEPTools for CAD data processing and exchange. Organizations utilizing this library in critical workflows such as product design, manufacturing, or engineering analysis face significant risk of service disruption when attackers exploit this vulnerability through crafted files that may be encountered during normal business operations. The vulnerability's exploitation can occur in various contexts including web applications that accept STEP file uploads, automated data processing pipelines, or collaborative platforms where users can submit design files. From an attacker's perspective, this flaw aligns with ATT&CK technique T1499.004 which covers network denial of service attacks, and can be classified under T1566.001 for spearphishing attachments that contain malicious files. The vulnerability's presence in the ifcmesh library means that any application built on top of STEPTools v18SP1 is potentially exposed to this attack vector, creating a widespread impact across multiple software implementations that depend on this particular library version.
Mitigation strategies for CVE-2023-0973 should focus on immediate defensive measures including input validation and sanitization of all files processed through the affected library, along with implementing proper error handling mechanisms that prevent null pointer dereference conditions from causing application termination. Organizations should prioritize updating to the latest version of STEPTools that contains patches for this vulnerability, as the vendor has likely released a fixed version that addresses the null pointer dereference issue. Additionally, implementing sandboxing techniques for file processing, deploying network segmentation to limit exposure, and establishing robust monitoring for application crash events can help detect exploitation attempts. The implementation of proper memory safety checks and defensive programming practices within the library codebase would address the root cause by ensuring that all pointer operations include appropriate null checks before memory access occurs. Security teams should also consider implementing file type validation and content scanning mechanisms to identify and reject potentially malicious files before they reach the vulnerable library processing routines.