Discourse up to 3.0.1/3.1.0.beta2 Message display_personal_messages_tag_counts information disclosure

Summaryinfo

A vulnerability was found in Discourse up to 3.0.1/3.1.0.beta2 and classified as problematic. The affected element is the function display_personal_messages_tag_counts of the component Message Handler. Such manipulation leads to information disclosure. This vulnerability is uniquely identified as CVE-2023-23935. The attack can be launched remotely. No exploit exists. It is best practice to apply a patch to resolve this issue.

Detailsinfo

A vulnerability was found in Discourse up to 3.0.1/3.1.0.beta2. It has been rated as problematic. Affected by this issue is the function display_personal_messages_tag_counts of the component Message Handler. The manipulation with an unknown input leads to a information disclosure vulnerability. Using CWE to declare the problem leads to CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. Impacted is confidentiality. CVE summarizes:

Discourse is an open-source messaging platform. In versions 3.0.1 and prior on the `stable` branch and versions 3.1.0.beta2 and prior on the `beta` and `tests-passed` branches, the count of personal messages displayed for a tag is a count of all personal messages regardless of whether the personal message is visible to a given user. As a result, any users can technically poll a sensitive tag to determine if a new personal message is created even if the user does not have access to the personal message. In the patched versions, the count of personal messages tagged with a given tag is hidden by default. To revert to the old behaviour of displaying the count of personal messages for a given tag, an admin may enable the `display_personal_messages_tag_counts` site setting.

The weakness was disclosed 03/17/2023 as GHSA-rf8j-mf8c-82v7. The advisory is available at github.com. This vulnerability is handled as CVE-2023-23935 since 01/19/2023. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1592 by the MITRE ATT&CK project.

Applying the patch f31f0b70f82c43d93220ce6fc0d4f57440452f37 is able to eliminate this problem. The bugfix is ready for download at github.com.

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Productinfo

Type

• Chat Software

Name

• Discourse

Version

• 3.0.0
• 3.0.1
• 3.1.0.beta1
• 3.1.0.beta2

License

• open-source

Website

• Product: https://github.com/discourse/discourse/

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