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LINE Debugging Interface Information Disclosure

Medium

Synopsis

When monitoring bot accounts, users use the chat streaming API as a means to view chat, event, and other logs for a given bot. A sample logging endpoint looks like the following: https://chat-streaming-api.line.biz/api/v1/sse?token=kixNaKJQJ6iVNZWLVL6...  Accessing this endpoint does not require any authentication beyond what is included in the URL. If this link were generated and passed around to developers or captured in some sort of log aggregator, it could potentially be leaked to parties that should not have this privilege. This exposed potentially sensitive chat communications and PII of users communicating with the bot.

Solution

LINE has patched this issue by limiting all access tokens to a single use.

Disclosure Timeline

February 3, 2021 - Tenable requests security contact.
February 4, 2021 - Vendor provides dedicated security contact.
February 8, 2021 - Tenable discloses vulnerabilities.
February 9, 2021 - Vendor acknowledges.
March 2, 2021 - Tenable requests status update.
March 8, 2021 - Vendor states that issue was patched.

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Tenable takes product security very seriously. If you believe you have found a vulnerability in one of our products, we ask that you please work with us to quickly resolve it in order to protect customers. Tenable believes in responding quickly to such reports, maintaining communication with researchers, and providing a solution in short order.

For more details on submitting vulnerability information, please see our Vulnerability Reporting Guidelines page.

If you have questions or corrections about this advisory, please email [email protected]

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