Nextcloud Server up to 19.0.12/20.0.10/21.0.2 WebAuthn authentication replay

Summaryinfo

A vulnerability categorized as critical has been discovered in Nextcloud Server up to 19.0.12/20.0.10/21.0.2. Affected by this vulnerability is an unknown functionality of the component WebAuthn. Executing a manipulation can lead to authentication replay. The identification of this vulnerability is CVE-2021-32726. The attack may be launched remotely. There is no exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in Nextcloud Server up to 19.0.12/20.0.10/21.0.2 (Cloud Software). This vulnerability affects an unknown functionality of the component WebAuthn. The manipulation with an unknown input leads to a authentication replay vulnerability. The CWE definition for the vulnerability is CWE-294. A capture-replay flaw exists when the design of the product makes it possible for a malicious user to sniff network traffic and bypass authentication by replaying it to the server in question to the same effect as the original message (or with minor changes). As an impact it is known to affect confidentiality, integrity, and availability.

The weakness was shared 07/13/2021. The advisory is available at github.com. This vulnerability was named CVE-2021-32726. Successful exploitation requires user interaction by the victim. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1040 by the MITRE ATT&CK project.

Upgrading to version 19.0.13, 20.0.11 or 21.0.3 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.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

• Cloud Software

Vendor

• Nextcloud

Name

• Server

Version

• 19.0.0
• 19.0.1
• 19.0.2
• 19.0.3
• 19.0.4
• 19.0.5
• 19.0.6
• 19.0.7
• 19.0.8
• 19.0.9
• 19.0.10
• 19.0.11
• 19.0.12
• 20.0.0
• 20.0.1
• 20.0.2
• 20.0.3
• 20.0.4
• 20.0.5
• 20.0.6
• 20.0.7
• 20.0.8
• 20.0.9
• 20.0.10
• 21.0.0
• 21.0.1
• 21.0.2

License

• open-source

Website

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

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CPE 2.2info

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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