Vulnerability Details : CVE-2023-35928
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.
Products affected by CVE-2023-35928
- Nextcloud » Nextcloud Server » Enterprise EditionVersions from including (>=) 20.0.0 and before (<) 20.0.14.14cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:enterprise:*:*:*
- Nextcloud » Nextcloud Server » Enterprise EditionVersions from including (>=) 23.0.0 and before (<) 23.0.12.7cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:enterprise:*:*:*
- Nextcloud » Nextcloud Server » Enterprise EditionVersions from including (>=) 25.0.0 and before (<) 25.0.7cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:enterprise:*:*:*
- Nextcloud » Nextcloud Server » Enterprise EditionVersions from including (>=) 24.0.0 and before (<) 24.0.12.2cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:enterprise:*:*:*
- Nextcloud » Nextcloud Server » Enterprise EditionVersions from including (>=) 26.0.0 and before (<) 26.0.2cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:enterprise:*:*:*
- Nextcloud » Nextcloud Server » Enterprise EditionVersions from including (>=) 21.0.0 and before (<) 21.0.9.12cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:enterprise:*:*:*
- Nextcloud » Nextcloud Server » Enterprise EditionVersions from including (>=) 22.0.0 and before (<) 22.2.10.12cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:enterprise:*:*:*
- cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:-:*:*:*
- Nextcloud » Nextcloud Server » Enterprise EditionVersions from including (>=) 19.0.0 and before (<) 19.0.13.9cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:enterprise:*:*:*
- cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:-:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2023-35928
0.28%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 68 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2023-35928
Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
---|---|---|---|---|---|---|
8.8
|
HIGH | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
2.8
|
5.9
|
NIST | |
8.4
|
HIGH | CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:H |
1.7
|
6.0
|
GitHub, Inc. |
CWE ids for CVE-2023-35928
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The product does not handle or incorrectly handles when it has insufficient privileges to perform an operation, leading to resultant weaknesses.Assigned by: security-advisories@github.com (Secondary)
References for CVE-2023-35928
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https://hackerone.com/reports/1978882
Sign in | HackerOneThird Party Advisory
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https://github.com/nextcloud/security-advisories/security/advisories/GHSA-637g-xp2c-qh5h
User scoped external storage can be used to gather credentials of other users · Advisory · nextcloud/security-advisories · GitHubVendor Advisory
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https://github.com/nextcloud/server/pull/38265
check the username when doing external storage session auth by icewind1991 · Pull Request #38265 · nextcloud/server · GitHubIssue Tracking
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