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Medium severity · published Apr 4, 2023
CVE-2023-28999
Nextcloud is an open-source productivity platform
6.4
CVSS
0.7%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:L
Attack vector
Network
Complexity
Low
Privileges
High
User interaction
Required
Confidentiality
High
Integrity
High
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.7% · higher than 52% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
DE
Desktop · Nextcloud
3.0.0 before 3.8.0 · source: NVD
NE
Nextcloud · Nextcloud
3.0.5 before 4.8.0; 3.13.0 before 3.25.0 · source: NVD
Affected product
DE
Desktop
Nextcloud
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-28999
CVE.org
https://www.cve.org/CVERecord?id=CVE-2023-28999
Exploit
https://ethz.ch/content/dam/ethz/special-interest/infk/inst-infsec/appliedcrypto/education/theses/report_DanieleCoppola.pdf
Patch
https://github.com/nextcloud/desktop/pull/5560
Vendor Advisory
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-8875-wxww-3rr8
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