CVE-2023-28999

Nextcloud: Lack of authenticity of metadata keys allows a malicious server to gain access to E2EE folders

CVSS 6.9 MEDIUMEPSS 0.7%CWE-325

Vexday Risk Score

13Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 6.9EPSS 0.7%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

04 Apr 2023Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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.

CVSS:3.1/AV:P/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:L

Affected products

nextcloud · security-advisories

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References

https://ethz.ch/content/dam/ethz/special-interest/infk/inst-infsec/appliedcrypto/education/theses/report_DanieleCoppola.pdf https://github.com/nextcloud/desktop/pull/5560 https://github.com/nextcloud/security-advisories/security/advisories/GHSA-8875-wxww-3rr8