Get a Demo

Let's Patch It!

Book a short call with one our specialists, we'll walk you through how Endor Patches work, and ask you a few questions about your environment (like your primary programming languages and repository management). We'll also send you an email right after you fill out the form, feel free to reply with any questions you have in advance!

CVE

CVE-2023-35927

Nextcloud system addressbooks can be modified by malicious trusted server
Back to all
CVE

CVE-2023-35927

Nextcloud system addressbooks can be modified by malicious trusted server

NextCloud Server and NextCloud Enterprise Server provide file storage for Nextcloud, a self-hosted productivity platform. In NextCloud Server versions 25.0.0 until 25.0.7 and 26.0.0 until 26.0.2 and Nextcloud Enterprise Server versions 21.0.0 until 21.0.9.12, 22.0.0 until 22.2.10.12, 23.0.0 until 23.0.12.7, 24.0.0 until 24.0.12.2, 25.0.0 until 25.0.7, and 26.0.0 until 26.0.2, when two server are registered as trusted servers for each other and successfully exchanged the share secrets, the malicious server could modify or delete VCards in the system addressbook on the origin server. This would impact the available and shown information in certain places, such as the user search and avatar menu. If a manipulated user modifies their own data in the personal settings the entry is fixed again.

Nextcloud Server n 25.0.7 and 26.0.2 and Nextcloud Enterprise Server 21.0.9.12, 22.2.10.12, 23.0.12.7, 24.0.12.2, 25.0.7, and 26.0.2 contain a patch for this issue. A workaround is available. Remove all trusted servers in the "Administration" > "Sharing" settings …/index.php/settings/admin/sharing. Afterwards, trigger a recreation of the local system addressbook with the following occ dav:sync-system-addressbook.

Package Versions Affected

Package Version
patch Availability
No items found.

Automatically patch vulnerabilities without upgrading

Fix Without Upgrading
Detect compatible fix
Apply safe remediation
Fix with a single pull request

CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
7.6
-
3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:L
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:L
C
H
U
-

Related Resources

No items found.

References

https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/35xxx/CVE-2023-35927.json, https://github.com/nextcloud/security-advisories/security/advisories/GHSA-h7f7-535f-7q87, https://github.com/nextcloud/server/pull/38247, https://hackerone.com/reports/1976754, https://nvd.nist.gov/vuln/detail/CVE-2023-35927

Severity

7.6

CVSS Score
0
10

Basic Information

Ecosystem
Base CVSS
7.6
EPSS Probability
0.00177%
EPSS Percentile
0.39436%
Introduced Version
20ea9a25353129b56d46951fe7d23939665ab2b2
Fix Available
f14c1100ecae34309931be4c51c8d82296ad17d2

Fix Critical Vulnerabilities Instantly

Secure your app without upgrading.
Fix Without Upgrading