Executive Summary

This vulnerability affects Mattermost Plugins versions up to 11.6, 10.18.11, 11.3.6, and 11.6.5.0. The issue is that these versions fail to properly sanitize error responses received from the OpenAI API before logging them.

As a result, a user who has access to the server logs or support packets can inspect the mattermost.log entries generated during authentication failures and obtain a valid or partially reconstructable OpenAI API key.

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Impact Analysis

The vulnerability can lead to unauthorized disclosure of OpenAI API keys by exposing them in server logs.

If an attacker or unauthorized user gains access to these logs, they could retrieve the API key and potentially misuse it, leading to unauthorized access to OpenAI services or data.

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Detection Guidance

This vulnerability can be detected by inspecting the mattermost.log entries for error responses from the OpenAI API that have not been sanitized. Specifically, look for logs generated during authentication failures that may contain valid or partially reconstructable OpenAI API keys.

Commands to detect this might include searching the log files for suspicious entries related to OpenAI API authentication errors. For example, using grep on Linux systems:

• grep -i 'openai' /path/to/mattermost.log
• grep -i 'authentication failure' /path/to/mattermost.log
• grep -Eo 'sk-[a-zA-Z0-9]{48}' /path/to/mattermost.log # to search for possible API keys

These commands help identify if any OpenAI API keys or related sensitive information have been logged due to the vulnerability.

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Mitigation Strategies

Immediate mitigation steps include upgrading Mattermost Plugins to a version later than 11.6, 10.18.11, 11.3.6, or 11.6.5.0 where this vulnerability is fixed.

Additionally, restrict access to server logs and support packets to trusted personnel only, as the vulnerability allows users with such access to obtain OpenAI API keys.

Review and rotate any potentially exposed OpenAI API keys to prevent unauthorized use.

Monitor Mattermost Security Updates for official patches and advisories.

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Compliance Impact

This vulnerability allows a user with access to server logs or support packets to obtain a valid or partially reconstructable OpenAI API key by inspecting log entries. Exposure of sensitive API keys in logs could lead to unauthorized access to data or services, potentially impacting the confidentiality requirements of standards like GDPR and HIPAA.

Since the vulnerability involves failure to sanitize error responses before logging, it may result in leakage of sensitive information, which is a concern under data protection regulations that mandate secure handling and logging of sensitive data.

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