Bug 1226371 (CVE-2024-37887)

Summary: VUL-0: CVE-2024-37887: nextcloud: events information leaked with shared calendars on recurrence exceptions
Product: [openSUSE] openSUSE Distribution Reporter: SMASH SMASH <smash_bz>
Component: SecurityAssignee: Eric Schirra <ecsos>
Status: NEW --- QA Contact: Security Team bot <security-team>
Severity: Normal    
Priority: P3 - Medium CC: camila.matos
Version: Leap 15.6   
Target Milestone: ---   
Hardware: Other   
OS: Other   
URL: https://smash.suse.de/issue/411001/
Whiteboard:
Found By: Security Response Team Services Priority:
Business Priority: Blocker: ---
Marketing QA Status: --- IT Deployment: ---

Description SMASH SMASH 2024-06-14 18:46:47 UTC 
Nextcloud Server is a self hosted personal cloud system. Private shared calendar events' recurrence exceptions can be read by sharees. It is recommended that the Nextcloud Server is upgraded to 27.1.10 or 28.0.6 or 29.0.1 and that the Nextcloud Enterprise Server is upgraded to 27.1.10 or 28.0.6 or 29.0.1.

References:
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2024-37887
https://www.cve.org/CVERecord?id=CVE-2024-37887
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-h4xv-cjpm-j595
https://github.com/nextcloud/server/pull/45309
https://hackerone.com/reports/2479325
Comment 2 Eric Schirra 2024-06-15 09:31:05 UTC 
This once again shows a problem with the stubborn adherence to the default of no major or minor update of packages.
The major version 24 is EndOfLife since 2023-04.
https://github.com/nextcloud/server/wiki/Maintenance-and-Release-Schedule

Leap 15.6 just came out a few days ago. With a package that has been dead for a year.

You can't update from 24 to 29 either. Even if you are allowed to according to suse specifications. Because in nextcloud you only have to/may only update one level at a time. 24 -> 25 -> 26 -> 27 -> 28 -> 29.

So what should you do in this case?