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CVE-2023-28999

Date: April 4, 2023

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.

Language: C++

Severity Score

Related Resources (6)

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-8875-wxww-3rr8
https://ethz.ch/content/dam/ethz/special-interest/infk/inst-infsec/appliedcrypto/education/theses/report_DanieleCoppola.pdf
https://security-tracker.debian.org/tracker/CVE-2023-28999
https://nvd.nist.gov/vuln/detail/CVE-2023-28999
https://github.com/nextcloud/desktop/pull/5560
https://www.mend.io/vulnerability-database/CVE-2023-28999

Severity Score

Weakness Type (CWE)

Missing Encryption of Sensitive Data

CWE-311

Missing Cryptographic Step

CWE-325

CVSS v3.1

Base Score:
Attack Vector (AV): PHYSICAL
Attack Complexity (AC): LOW
Privileges Required (PR): HIGH
User Interaction (UI): REQUIRED
Scope (S): CHANGED
Confidentiality (C): HIGH
Integrity (I): HIGH
Availability (A): LOW

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