Nextcloud Server 19.0.1 Encrypted File downgrade

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CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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3.3$0-$5k0.00

A vulnerability classified as problematic was found in Nextcloud Server 19.0.1 (Cloud Software). This vulnerability affects some unknown functionality of the component Encrypted File Handler. The manipulation with an unknown input leads to a weak encryption vulnerability. The CWE definition for the vulnerability is CWE-757. As an impact it is known to affect confidentiality. CVE summarizes:

A cryptographic issue in Nextcloud Server 19.0.1 allowed an attacker to downgrade the encryption scheme and break the integrity of encrypted files.

The weakness was published 11/09/2020. The advisory is available at hackerone.com. This vulnerability was named CVE-2020-8150 since 01/28/2020. The exploitation appears to be difficult. The attack can only be initiated within the local network. A single authentication is required for exploitation. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1008 by the MITRE ATT&CK project.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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VulDB Meta Base Score: 3.3
VulDB Meta Temp Score: 3.3

VulDB Base Score: 2.6
VulDB Temp Score: 2.6
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 4.1
NVD Vector: 🔒

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

NVD Base Score: 🔒

Exploitinginfoedit

Class: Weak encryption
CWE: CWE-757
ATT&CK: T1008

Local: No
Remote: Partially

Availability: 🔒
Status: Not defined

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat: 🔍
Adversaries: 🔍
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Countermeasuresinfoedit

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfoedit

01/28/2020 CVE assigned
11/09/2020 +286 days Advisory disclosed
11/09/2020 +0 days VulDB entry created
12/04/2020 +25 days VulDB last update

Sourcesinfoedit

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

CVE: CVE-2020-8150 (🔒)

Entryinfoedit

Created: 11/09/2020 10:29 PM
Updated: 12/04/2020 07:19 AM
Changes: (18) vulnerability_cvss3_nvd_av vulnerability_cvss3_nvd_ac vulnerability_cvss3_nvd_pr vulnerability_cvss3_nvd_ui vulnerability_cvss3_nvd_s vulnerability_cvss3_nvd_c vulnerability_cvss3_nvd_i vulnerability_cvss3_nvd_a vulnerability_cvss2_nvd_av vulnerability_cvss2_nvd_ac vulnerability_cvss2_nvd_au vulnerability_cvss2_nvd_ci vulnerability_cvss2_nvd_ii vulnerability_cvss2_nvd_ai vulnerability_cvss3_meta_basescore vulnerability_cvss3_meta_tempscore vulnerability_cvss2_nvd_basescore vulnerability_cvss3_nvd_basescore
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