Nextcloud Server up to 18.0.10/19.0.4/20.0.1 Markdown cross site scripting

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 (≈)
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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.
3.4$0-$5k0.00

Summaryinfo

A vulnerability labeled as problematic has been found in Nextcloud Server up to 18.0.10/19.0.4/20.0.1. This vulnerability affects unknown code of the component Markdown Handler. Such manipulation leads to cross site scripting. This vulnerability is uniquely identified as CVE-2020-8294. The attack can be launched remotely. No exploit exists. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Nextcloud Server up to 18.0.10/19.0.4/20.0.1 (Cloud Software). It has been rated as problematic. Affected by this issue is an unknown part of the component Markdown Handler. The manipulation with an unknown input leads to a cross site scripting vulnerability. Using CWE to declare the problem leads to CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. Impacted is integrity.

The weakness was disclosed 02/04/2021 as https:/hackerone.com/reports/1023787. The advisory is shared for download at nextcloud.com. This vulnerability is handled as CVE-2020-8294. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1059.007.

Upgrading to version 18.0.11, 19.0.5 or 20.0.2 eliminates this vulnerability.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

Vendor

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 3.5
VulDB Meta Temp Score: 3.4

VulDB Base Score: 3.5
VulDB Temp Score: 3.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Cross site scripting
CWE: CWE-79 / CWE-94 / CWE-74
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Server 18.0.11/19.0.5/20.0.2

Timelineinfo

01/28/2020 🔍
02/04/2021 +373 days 🔍
02/04/2021 +0 days 🔍
02/23/2021 +19 days 🔍

Sourcesinfo

Advisory: https:/hackerone.com/reports/1023787
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2020-8294 (🔍)
GCVE (CVE): GCVE-0-2020-8294
GCVE (VulDB): GCVE-100-169172

Entryinfo

Created: 02/04/2021 10:38
Updated: 02/23/2021 13:00
Changes: 02/04/2021 10:38 (40), 02/23/2021 13:00 (6)
Complete: 🔍
Cache ID: 216::103

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