CVE-2021-33714 in JT Utilities
Summary
by MITRE • 07/13/2021
A vulnerability has been identified in JT Utilities (All versions < V13.0.2.0). When parsing specially crafted JT files, a missing check for the validity of an iterator leads to NULL pointer deference condition, causing the application to crash. An attacker could leverage this vulnerability to cause a Denial-of-Service condition in the application.
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Analysis
by VulDB Data Team • 07/16/2021
The vulnerability identified as CVE-2021-33714 affects JT Utilities software across all versions prior to V13.0.2.0, representing a critical security flaw that compromises application stability and availability. This issue manifests specifically during the parsing of JT files, which are commonly used in product lifecycle management and engineering data exchange environments. The vulnerability resides within the file processing logic where the application fails to properly validate iterator states during data parsing operations, creating a dangerous condition that can be exploited by malicious actors.
The technical root cause of this vulnerability stems from a missing validation check for iterator validity within the JT file parsing routine. When the application encounters specially crafted JT files containing malformed iterator references, it attempts to dereference a null pointer without proper bounds checking or state validation. This fundamental flaw in input validation creates a NULL pointer dereference condition that directly results in application crash and termination. The vulnerability operates at the intersection of improper input validation and memory management errors, making it particularly dangerous in production environments where continuous availability is critical.
From an operational perspective, this vulnerability presents a significant denial-of-service risk that can severely impact business operations. Attackers can exploit this weakness by crafting malicious JT files that trigger the NULL pointer dereference, causing the JT Utilities application to terminate unexpectedly. This disruption can occur during critical engineering processes, data exchange operations, or automated workflows that depend on the application's stability. The impact extends beyond simple application crashes as it can interrupt entire product development cycles, data processing pipelines, and collaborative engineering environments that rely on consistent software availability.
The vulnerability aligns with CWE-476 which specifically addresses NULL pointer dereference conditions, and it demonstrates characteristics consistent with ATT&CK technique T1499.004 related to network denial of service attacks. Organizations using JT Utilities in manufacturing, engineering, or product development environments face particular risk as these systems often operate continuously and cannot afford unexpected downtime. The attack surface is relatively narrow since it requires specific file format manipulation, but the potential impact on business operations makes it a serious concern for enterprises dependent on these tools.
Mitigation strategies should prioritize immediate deployment of the vendor-provided patch or update to version V13.0.2.0 which addresses the iterator validation issue. Organizations should implement additional defensive measures including input validation for JT files, network segmentation to limit exposure, and monitoring for unusual application termination patterns. Security teams should also consider implementing file scanning solutions that can detect and quarantine suspicious JT files before they reach the vulnerable application. Regular security assessments of engineering tools and software dependencies should be conducted to identify similar validation gaps that could lead to comparable denial-of-service conditions.
The vulnerability highlights the importance of robust input validation in file processing applications, particularly those handling complex engineering data formats. It underscores the need for comprehensive security testing including fuzzing and boundary condition testing for parsing routines. Organizations should establish secure coding practices that mandate iterator validation and null pointer checks in all data processing functions. Additionally, implementing proper error handling and graceful degradation mechanisms can help prevent complete application crashes while maintaining system availability during edge case scenarios.