Improper Certificate Validation Affecting nextcloud-desktop package, versions <3.3.1-1


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.45% (75th percentile)

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  • Snyk IDSNYK-DEBIANUNSTABLE-NEXTCLOUDDESKTOP-1567817
  • published20 Aug 2021
  • disclosed18 Aug 2021

Introduced: 18 Aug 2021

CVE-2021-32728  (opens in a new tab)
CWE-295  (opens in a new tab)

How to fix?

Upgrade Debian:unstable nextcloud-desktop to version 3.3.1-1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream nextcloud-desktop package and not the nextcloud-desktop package as distributed by Debian. See How to fix? for Debian:unstable relevant fixed versions and status.

The Nextcloud Desktop Client is a tool to synchronize files from Nextcloud Server with a computer. Clients using the Nextcloud end-to-end encryption feature download the public and private key via an API endpoint. In versions prior to 3.3.0, the Nextcloud Desktop client fails to check if a private key belongs to previously downloaded public certificate. If the Nextcloud instance serves a malicious public key, the data would be encrypted for this key and thus could be accessible to a malicious actor. This issue is fixed in Nextcloud Desktop Client version 3.3.0. There are no known workarounds aside from upgrading.

CVSS Scores

version 3.1