Nextcloud Server up to 16.0.8/17.0.3/18.0.0 Access Control /download access control

entryeditHistoryDiffjsonxmlCTI

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
5.1	$0-$5k	0.11

A vulnerability was found in Nextcloud Server up to 16.0.8/17.0.3/18.0.0 (Cloud Software). It has been classified as problematic. Affected is an unknown part of the file /download of the component Access Control. The manipulation with an unknown input leads to a privilege escalation vulnerability. CWE is classifying the issue as CWE-284. This is going to have an impact on confidentiality. CVE summarizes:

A missing access control check in Nextcloud Server < 18.0.1, < 17.0.4, and < 16.0.9 causes hide-download shares to be downloadable when appending /download to the URL.

The weakness was published 03/20/2020 (Website). The advisory is shared for download at nextcloud.com. This vulnerability is traded as CVE-2020-8139 since 01/28/2020. The exploitability is told to be easy. It is possible to launch the attack remotely. A authentication is necessary for exploitation. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1068.

Upgrading to version 16.0.9, 17.0.4 or 18.0.1 eliminates this vulnerability.

Similar entry is available at 151979.

Productinfoedit

Type

Cloud Software

Name

Nextcloud Server

CPE 2.3infoedit

CPE 2.2infoedit

CVSSv3infoedit

VulDB Meta Base Score: 5.4
VulDB Meta Temp Score: 5.1

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 6.5
NVD Vector: 🔒

CVSSv2infoedit

AV	AC	Au	C	I	A
🔍	🔍	🔍	🔍	🔍	🔍
🔍	🔍	🔍	🔍	🔍	🔍
🔍	🔍	🔍	🔍	🔍	🔍

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
unlock	unlock	unlock	unlock	unlock	unlock
unlock	unlock	unlock	unlock	unlock	unlock
unlock	unlock	unlock	unlock	unlock	unlock

VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

NVD Base Score: 🔒

Exploitinginfoedit

Class: Privilege escalation
CWE: CWE-284
ATT&CK: T1068

Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

Price Prediction: 🔍
Current Price Estimation: 🔒

0-Day	unlock	unlock	unlock	unlock
Today	unlock	unlock	unlock	unlock

Threat Intelligenceinfoedit

Threat: 🔍
Adversaries: 🔍
Geopolitics: 🔍
Economy: 🔍
Predictions: 🔍
Remediation: 🔍

Countermeasuresinfoedit

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Nextcloud Server 16.0.9/17.0.4/18.0.1

Timelineinfoedit

01/28/2020 CVE assigned
03/20/2020 +52 days Advisory disclosed
03/21/2020 +1 days VulDB entry created
10/04/2020 +197 days VulDB last update

Sourcesinfoedit

Advisory: nextcloud.com
Status: Not defined
Confirmation: 🔒

CVE: CVE-2020-8139 (🔒)
See also: 🔒

Entryinfoedit

Created: 03/21/2020 09:16 AM
Updated: 10/04/2020 03:29 PM
Changes: (1) advisory_confirm_url
Complete: 🔍