Denial of Service in lo48576 fbxcel

Executive Summary

This vulnerability exists in the lo48576 fbxcel software up to version 0.9.0, specifically in the file src/pull_parser/v7400/parser.rs within the Node Header Handler component. It allows an attacker with local access to manipulate the system in a way that causes a denial of service.

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Impact Analysis

The impact of this vulnerability is a denial of service, meaning that the affected software or system could become unavailable or unresponsive when exploited by an attacker with local access.

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Detection Guidance

This vulnerability involves processing malformed FBX files with large or malformed length prefixes that cause denial of service via memory exhaustion or arithmetic overflow.

Detection can focus on monitoring applications that use the fbxcel library, especially those parsing FBX files locally.

Since the attack must be initiated locally and involves malformed FBX files, you can detect suspicious FBX files by checking for unusually large attribute length fields or monitoring application crashes related to FBX parsing.

No specific commands are provided in the resources, but you might use file inspection or custom scripts to parse FBX files and check for abnormal length prefixes in attributes.

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Mitigation Strategies

Immediate mitigation involves avoiding processing untrusted or malformed FBX files locally, as the vulnerability requires local attack initiation.

If you maintain software using the fbxcel library, apply the fix from the pending pull request that replaces unchecked arithmetic with safe checked operations to prevent panics and overflows.

Additionally, implement validation to check length prefixes before allocating memory to prevent excessive or out-of-memory allocations.

Until the fix is accepted and deployed, restrict access to the vulnerable component and monitor for abnormal memory usage or crashes during FBX file processing.

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Compliance Impact

The vulnerability results in a denial of service that must be initiated locally and does not impact confidentiality or integrity.

Since the vulnerability does not involve data breach or unauthorized data access, it is unlikely to directly affect compliance with standards such as GDPR or HIPAA, which primarily focus on data protection and privacy.

However, denial of service could indirectly impact availability requirements under some regulations, but given the low severity score and local attack vector, the compliance impact is minimal.

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