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CVE-2023-28999

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

Published: Apr 4, 2023Updated: Nov 21, 2024 Sources: CVE List NVDCWE-325
NVD MITRE
6.9CVSSMEDIUM
EPSS Score
0.7%
Top 52.6%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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 Breakdown

AV:PAC:LPR:HUI:RS:CC:HI:HA:L
Exploitability
AV:PAttack Vector
Physical
AC:LAttack Complexity
Low
PR:HPrivileges Required
High
UI:RUser Interaction
Required
Scope
S:CScope
Changed
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:LAvailability
Low
Open in CVSS calculator →

Weaknesses

CWE-325CWE-311

Affected Products

security-advisoriesnextcloud
SaaSSaaS Service
Cloud & SaaS / saas-application
desktopnextcloud
On-premDesktop App
Cloud & SaaS / saas-application
nextcloudnextcloud
SaaSSaaS Service
Cloud & SaaS / saas-application
nextcloudoss-projectDECloud & SaaSaka nextcloud server

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

1 technique
Collection
View detailed technique mapping

References

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

Timeline

Published
Apr 4, 2023
Last Updated
Nov 21, 2024

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