Nextcloud Calendar up to 4.4.3 Email Address resource consumption

Summaryinfo

A vulnerability marked as problematic has been reported in Nextcloud Calendar up to 4.4.3. Affected by this issue is some unknown functionality of the component Email Address Handler. The manipulation leads to resource consumption. This vulnerability is traded as CVE-2023-45150. It is possible to initiate the attack remotely. There is no exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in Nextcloud Calendar up to 4.4.3 (Calendar Software). This issue affects an unknown code of the component Email Address Handler. The manipulation with an unknown input leads to a resource consumption vulnerability. Using CWE to declare the problem leads to CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. Impacted is availability. The summary by CVE is:

Nextcloud calendar is a calendar app for the Nextcloud server platform. Due to missing precondition checks the server was trying to validate strings of any length as email addresses even when megabytes of data were provided, eventually making the server busy and unresponsive. It is recommended that the Nextcloud Calendar app is upgraded to 4.4.4. The only workaround for users unable to upgrade is to disable the calendar app.

The weakness was shared 10/16/2023 as GHSA-r936-8gwm-w452. The advisory is shared at github.com. The identification of this vulnerability is CVE-2023-45150 since 10/04/2023. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1499 for this issue.

Upgrading to version 4.4.4 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.

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Productinfo

Type

• Calendar Software

Vendor

• Nextcloud

Name

• Calendar

Version

• 4.4.0
• 4.4.1
• 4.4.2
• 4.4.3

License

• open-source

Website

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

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