Vulnerability · Published Apr 4, 2023 · Assigned by GitHub_M
CVE-2023-28999Nextcloud: Lack of authenticity of metadata keys allows a malicious server to gain access to E2EE folders
Medium 6.9
In plain English
A medium-severity security flaw in security-advisories from nextcloud. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 52% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Nextcloud is an open-source productivity platform. In Nextcloud Desktop client 3.0.0 until 3.8.0, Nextcloud Android app 3.13.0 until 3.25.0, and Nextcloud iOS app 3.0.5 until 4.8.0, a malicious server administrator can gain full access to an end-to-end encrypted folder. They can decrypt files, recover the folder structure and add new files. This issue is fixed in Nextcloud Desktop 3.8.0, Nextcloud Android 3.25.0, and Nextcloud iOS 4.8.0. No known workarounds are available.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.20 | nextcloud-client | 3.8.1-r0 | ALPINE-CVE-2023-28999 |
| Alpine:v3.21 | nextcloud-client | 3.8.1-r0 | ALPINE-CVE-2023-28999 |
| Alpine:v3.22 | nextcloud-client | 3.8.1-r0 | ALPINE-CVE-2023-28999 |
| Alpine:v3.23 | nextcloud-client | 3.8.1-r0 | ALPINE-CVE-2023-28999 |
| Alpine:v3.24 | nextcloud-client | 3.8.1-r0 | ALPINE-CVE-2023-28999 |
| Debian:12 | nextcloud-desktop | no fix listed | DEBIAN-CVE-2023-28999 |
| Debian:13 | nextcloud-desktop | 3.9.0-1 | DEBIAN-CVE-2023-28999 |
| Debian:14 | nextcloud-desktop | 3.9.0-1 | DEBIAN-CVE-2023-28999 |
| Ubuntu:22.04:LTS | nextcloud-desktop | no fix listed | UBUNTU-CVE-2023-28999 |
| Ubuntu:24.04:LTS | nextcloud-desktop | no fix listed | UBUNTU-CVE-2023-28999 |
| Ubuntu:25.10 | nextcloud-desktop | no fix listed | UBUNTU-CVE-2023-28999 |
| Ubuntu:26.04:LTS | nextcloud-desktop | no fix listed | UBUNTU-CVE-2023-28999 |
| Ubuntu:26.10 | nextcloud-desktop | no fix listed | UBUNTU-CVE-2023-28999 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| nextcloud | security-advisories | >= 3.0.0, < 3.8.0>= 3.13.0, < 3.25.0>= 3.0.5, < 4.8.0 |
Weakness: CWE-325 · Vector: CVSS:3.1/AV:P/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:L
References
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-8875-wxww-3rr8 x_refsource_CONFIRM
- https://github.com/nextcloud/desktop/pull/5560 x_refsource_MISC
- https://ethz.ch/content/dam/ethz/special-interest/infk/inst-infsec/appliedcrypto/education/theses/report_DanieleCoppola.pdf x_refsource_MISC