Nextcloud Server up to 22.2.8/23.0.5/24.0.1 Federated Share sharing excessive authentication

Summaryinfo

A vulnerability was found in Nextcloud Server up to 22.2.8/23.0.5/24.0.1. It has been classified as problematic. This affects an unknown function of the file index.php/settings/admin/sharing of the component Federated Share Handler. This manipulation causes excessive authentication. The identification of this vulnerability is CVE-2022-31118. It is possible to initiate the attack remotely. There is no exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability has been found in Nextcloud Server up to 22.2.8/23.0.5/24.0.1 (Cloud Software) and classified as problematic. Affected by this vulnerability is an unknown code block of the file index.php/settings/admin/sharing of the component Federated Share Handler. The manipulation with an unknown input leads to a excessive authentication vulnerability. The CWE definition for the vulnerability is CWE-307. The product does not implement sufficient measures to prevent multiple failed authentication attempts within a short time frame, making it more susceptible to brute force attacks. As an impact it is known to affect confidentiality. The summary by CVE is:

Nextcloud server is an open source personal cloud solution. In affected versions an attacker could brute force to find if federated sharing is being used and potentially try to brute force access tokens for federated shares (`a-zA-Z0-9` ^ 15). It is recommended that the Nextcloud Server is upgraded to 22.2.9, 23.0.6 or 24.0.2. Users unable to upgrade may disable federated sharing via the Admin Sharing settings in `index.php/settings/admin/sharing`.

The weakness was shared 08/05/2022 as GHSA-2vwh-5v93-3vcq. The advisory is shared at github.com. This vulnerability is known as CVE-2022-31118 since 05/18/2022. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1110.001 for this issue.

Upgrading to version 22.2.9, 23.0.6 or 24.0.2 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• Cloud Software

Vendor

• Nextcloud

Name

• Server

Version

• 22.2.0
• 22.2.1
• 22.2.2
• 22.2.3
• 22.2.4
• 22.2.5
• 22.2.6
• 22.2.7
• 22.2.8
• 23.0.0
• 23.0.1
• 23.0.2
• 23.0.3
• 23.0.4
• 23.0.5
• 24.0.0
• 24.0.1

License

• open-source

Website

• Product: https://github.com/nextcloud/server/

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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