Impact Analysis

This vulnerability can cause protobufjs to throw exceptions or enter recursive calls, disrupting the normal operation of applications using affected protobufjs versions.

Such disruptions can lead to denial of service, where parts of the application relying on protobufjs for decoding, verification, serialization, or RPC calls may fail or become unresponsive.

The vulnerability does not allow attackers to execute arbitrary code or gain unauthorized access, but it can impact application availability and reliability.

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Executive Summary

This vulnerability affects protobufjs versions 8.0.0 to 8.5.0 and 7.6.0 to 7.6.2, where certain schema-derived names can shadow important runtime properties used by protobufjs helpers.

Specifically, fields named "hasOwnProperty", fields or oneof names like "$type" when loaded via JSON/reflection descriptors, and service methods with the generated helper name "rpcCall" can cause protobufjs to mistakenly read schema-controlled data instead of its internal helpers.

This leads to deterministic exceptions or recursive calls during operations such as decode post-checks, verification, object conversion, JSON serialization, or RPC invocation.

The issue does not allow code execution but can disrupt normal functionality, causing denial of service.

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Detection Guidance

This vulnerability can be detected by identifying if your system is running protobufjs versions between 7.6.0 to 7.6.2 or 8.0.0 to 8.5.0, which are affected versions.

Additionally, detection involves checking if your protobuf schemas contain fields named "hasOwnProperty", fields or oneof names like "$type" when loaded via JSON/reflection descriptors, or service methods that generate the helper name "rpcCall".

Since the vulnerability manifests as exceptions or recursive calls during decode post-checks, verification, object conversion, JSON serialization, or RPC invocation, monitoring application logs for such errors when processing protobuf messages can help detect the issue.

There are no specific commands provided in the resources, but you can use commands to check the protobufjs version in your project, for example:

• npm list protobufjs
• grep -rE 'hasOwnProperty|\$type|rpcCall' path/to/your/protobuf/schemas

Also, reviewing logs for errors related to decode post-checks or recursive calls in protobufjs usage may help identify exploitation attempts.

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Mitigation Strategies

Immediate mitigation steps include upgrading protobufjs to version 8.6.0 or 7.6.3, where this vulnerability is fixed.

If upgrading is not immediately possible, you should avoid loading untrusted schemas that contain the problematic field or method names such as "hasOwnProperty", "$type", or "rpcCall".

Another workaround is to validate and rename any schema-derived names that could collide with protobufjs runtime helpers before loading them.

These steps help prevent the vulnerability from causing exceptions or recursive calls that disrupt functionality.

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Compliance Impact

The provided information does not specify any direct impact of this vulnerability on compliance with common standards and regulations such as GDPR or HIPAA.

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