Vulnerability Details : CVE-2023-28998
Potential exploit
The Nextcloud Desktop Client is a tool to synchronize files from Nextcloud Server. Starting with version 3.0.0 and prior to version 3.6.5, 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.? Users should upgrade the Nextcloud Desktop client to 3.6.5 to receive a patch. No known workarounds are available.
Products affected by CVE-2023-28998
- cpe:2.3:a:nextcloud:desktop:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2023-28998
0.56%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 66 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2023-28998
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
6.1
|
MEDIUM | CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:N |
0.9
|
5.2
|
NIST | |
|
6.7
|
MEDIUM | CVSS:3.1/AV:P/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:N |
0.4
|
5.8
|
GitHub, Inc. |
CWE ids for CVE-2023-28998
-
The product does not implement a required step in a cryptographic algorithm, resulting in weaker encryption than advertised by the algorithm.Assigned by: security-advisories@github.com (Primary)
References for CVE-2023-28998
-
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-jh3g-wpwv-cqgr
Desktop clients misbehaves with end-to-end encryption when the server returns an empty list of metadata keys · Advisory · nextcloud/security-advisories · GitHubVendor Advisory
-
https://github.com/nextcloud/desktop/pull/5323
Bugfix/e2ee vulnerability empty metadatakeys by allexzander · Pull Request #5323 · nextcloud/desktop · GitHubPatch;Vendor Advisory
-
https://ethz.ch/content/dam/ethz/special-interest/infk/inst-infsec/appliedcrypto/education/theses/report_DanieleCoppola.pdf
Exploit;Technical Description;Third Party Advisory
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