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Debian DSA-4974-1 : nextcloud-desktop - security update

medium Nessus Plugin ID 153485

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Synopsis

The remote Debian host is missing one or more security-related updates.

Description

The remote Debian 10 / 11 host has packages installed that are affected by multiple vulnerabilities as referenced in the dsa-4974 advisory.

 - Nextcloud Desktop Client before 3.3.1 is vulnerable to improper certificate validation due to lack of SSL certificate verification when using the Register with a Provider flow. (CVE-2021-22895)

 - 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.
 (CVE-2021-32728)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Upgrade the nextcloud-desktop packages.

For the stable distribution (bullseye), these problems have been fixed in version 3.1.1-2+deb11u1.

See Also

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=989846

http://www.nessus.org/u?1c0ae60e

https://www.debian.org/security/2021/dsa-4974

https://security-tracker.debian.org/tracker/CVE-2021-22895

https://security-tracker.debian.org/tracker/CVE-2021-32728

https://packages.debian.org/source/buster/nextcloud-desktop

https://packages.debian.org/source/bullseye/nextcloud-desktop

Plugin Details

Severity: Medium

ID: 153485

File Name: debian_DSA-4974.nasl

Version: 1.4

Type: local

Agent: unix

Published: 9/19/2021

Updated: 11/30/2023

Supported Sensors: Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Medium

Base Score: 4.3

Temporal Score: 3.4

Vector: CVSS2#AV:N/AC:M/Au:N/C:N/I:P/A:N

CVSS Score Source: CVE-2021-22895

CVSS v3

Risk Factor: Medium

Base Score: 6.5

Temporal Score: 5.9

Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

CVSS Score Source: CVE-2021-32728

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:caja-nextcloud, p-cpe:/a:debian:debian_linux:dolphin-nextcloud, p-cpe:/a:debian:debian_linux:libnextcloudsync-dev, p-cpe:/a:debian:debian_linux:libnextcloudsync0, p-cpe:/a:debian:debian_linux:nautilus-nextcloud, p-cpe:/a:debian:debian_linux:nemo-nextcloud, p-cpe:/a:debian:debian_linux:nextcloud-desktop, p-cpe:/a:debian:debian_linux:nextcloud-desktop-cmd, p-cpe:/a:debian:debian_linux:nextcloud-desktop-common, p-cpe:/a:debian:debian_linux:nextcloud-desktop-doc, p-cpe:/a:debian:debian_linux:nextcloud-desktop-l10n, cpe:/o:debian:debian_linux:10.0, cpe:/o:debian:debian_linux:11.0

Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 9/19/2021

Vulnerability Publication Date: 6/11/2021

Reference Information

CVE: CVE-2021-22895, CVE-2021-32728