CVE-2023-35928
Description
Nextcloud Server is a space for data storage on Nextcloud, a self-hosted productivity playform. In NextCloud Server versions 25.0.0 until 25.0.7 and 26.0.0 until 26.0.2 and Nextcloud Enterprise Server versions 19.0.0 until 19.0.13.9, 20.0.0 until 20.0.14.14, 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, a user could use this functionality to get access to the login credentials of another user and take over their account. This issue has been patched in Nextcloud Server versions 25.0.7 and 26.0.2 and NextCloud Enterprise Server versions 19.0.13.9, 20.0.14.14, 21.0.9.12, 22.2.10.12, 23.0.12.7, 24.0.12.2, 25.0.7, and 26.0.2.
Three workarounds are available. Disable app files_external. Change config setting "Allow users to mount external storage" to disabled in "Administration" > "External storage" settings …/index.php/settings/admin/externalstorages. Change config setting to disallow users to create external storages in "Administration" > "External storage" settings …/index.php/settings/admin/externalstorages with the types FTP, Nextcloud, SFTP, and/or WebDAV.
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Affected products
5cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:-:*:*:*+ 2 more
- cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:-:*:*:*range: >=25.0.0,<25.0.7
- cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:enterprise:*:*:*range: >=19.0.0,<19.0.13.9
- (no CPE)range: 25.0.0 until 25.0.7, 26.0.0 until 26.0.2
- Range: 25.0.0 until 25.0.7, 26.0.0 until 26.0.2
- Range: Nextcloud Enterprise Server >= 19.0.0, < 19.0.13.9
Patches
Vulnerability mechanics
References
3- github.com/nextcloud/security-advisories/security/advisories/GHSA-637g-xp2c-qh5hnvdVendor Advisory
- hackerone.com/reports/1978882nvdThird Party Advisory
- github.com/nextcloud/server/pull/38265nvdIssue Tracking
News mentions
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