Share tokens for public calendars disclosed (NC-SA-2017-011)

Summary

#Share tokens for public calendars disclosed (NC-SA-2017-011)

Risk level: Medium CVSS v3 Base Score: 4.3 (AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N) CWE: Information Exposure Through Directory Listing (CWE-548)

#Description A logical error caused disclosure of valid share tokens for public calendars. Thus granting an attacker potentially access to publicly shared calendars without knowing the share token.

#Affected Software

• Nextcloud Server < 11.0.3 (CVE-2017-0894)

#Action Taken The error has been fixed and regression tests been added.

#Acknowledgements The Nextcloud team thanks the following people for their research and responsible disclosure of the above advisory:

• Lukas Reschke - Nextcloud GmbH ([email protected]) - Vulnerability discovery and disclosure.