Executive Summary

This vulnerability exists in Weblate versions prior to 5.17, where the tasks API did not verify user access for pending tasks.

As a result, users without proper access could potentially view logs of in-progress operations by brute-forcing the random UUID of the task.

However, exploiting this vulnerability is unlikely due to the default API rate limits that restrict brute-force attempts.

The issue was fixed in version 5.17.

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Impact Analysis

This vulnerability could allow unauthorized users to access logs of ongoing tasks that they should not have permission to see.

Such exposure might lead to information disclosure of sensitive or internal operational details.

However, the impact is limited by the difficulty of exploiting the vulnerability due to API rate limiting and the need to guess random UUIDs.

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Mitigation Strategies

To mitigate this vulnerability, upgrade Weblate to version 5.17 or later, where the issue has been fixed.

Additionally, consider enforcing strict API rate limits and monitoring for unusual brute-force attempts targeting task UUIDs.

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Compliance Impact

The vulnerability in Weblate prior to version 5.17 allows unauthorized users to access logs of in-progress operations by exploiting the tasks API without proper access verification. This improper access control could potentially lead to unauthorized disclosure of sensitive information within the system.

Such unauthorized access to data may impact compliance with data protection standards and regulations like GDPR or HIPAA, which require strict controls on access to personal or sensitive information to prevent data breaches.

However, exploitation is unlikely due to the need to brute-force random UUIDs under default API rate limits, and the confidentiality impact is rated low (CVSS 3.1 score 3.1). The issue has been fixed in version 5.17 by enforcing proper access control on pending tasks.

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Detection Guidance

This vulnerability involves unauthorized access to pending tasks in the Weblate API by guessing the random UUID of a task. Detection involves monitoring API requests for suspicious attempts to access task UUIDs, especially repeated or brute-force style requests to the tasks API endpoint.

You can detect potential exploitation attempts by analyzing your Weblate server logs for unusual access patterns to the tasks API, such as multiple failed attempts to retrieve tasks with different UUIDs.

Suggested commands to help detect such activity include:

• Using grep to find API calls to the tasks endpoint in Weblate access logs: grep "/api/tasks/" /path/to/weblate/access.log
• Counting unique IP addresses making requests to the tasks API: grep "/api/tasks/" /path/to/weblate/access.log | awk '{print $1}' | sort | uniq -c | sort -nr
• Detecting repeated requests with different UUIDs from the same IP (possible brute force): grep "/api/tasks/" /path/to/weblate/access.log | awk '{print $1, $7}' | sort | uniq -c | sort -nr

Additionally, monitoring for HTTP 403 or 404 responses from the tasks API endpoint may indicate access control enforcement or failed attempts to access unauthorized tasks.

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