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Vulnerability · Published Apr 4, 2023 · Assigned by GitHub_M

CVE-2023-28998Nextcloud Desktop client misbehaves with E2EE when the server returns empty list of metadata keys

Medium 6.7

In plain English

A medium-severity security flaw in security-advisories from nextcloud. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 53% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.7Medium
Exploit odds (30 days)0.7%top 47.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.20nextcloud-client3.6.6-r0ALPINE-CVE-2023-28998
Alpine:v3.21nextcloud-client3.6.6-r0ALPINE-CVE-2023-28998
Alpine:v3.22nextcloud-client3.6.6-r0ALPINE-CVE-2023-28998
Alpine:v3.23nextcloud-client3.6.6-r0ALPINE-CVE-2023-28998
Alpine:v3.24nextcloud-client3.6.6-r0ALPINE-CVE-2023-28998
Debian:12nextcloud-desktop3.7.0-1DEBIAN-CVE-2023-28998
Debian:13nextcloud-desktop3.7.0-1DEBIAN-CVE-2023-28998
Debian:14nextcloud-desktop3.7.0-1DEBIAN-CVE-2023-28998
Ubuntu:22.04:LTSnextcloud-desktopno fix listedUBUNTU-CVE-2023-28998

Affected products (as reported)

VendorProductVersions
nextcloud security-advisories >= 3.0.0, < 3.6.5

Weakness: CWE-325 · Vector: CVSS:3.1/AV:P/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:N

References