Mermaid up to 8.13.7 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.
4.7$0-$5k0.00

Summaryinfo

A vulnerability was found in Mermaid up to 8.13.7 and classified as problematic. Affected is an unknown function of the component Markdown Handler. Such manipulation leads to cross site scripting. This vulnerability is uniquely identified as CVE-2021-43861. The attack can be launched remotely. No exploit exists. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in Mermaid up to 8.13.7. Affected by this issue is an unknown code 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 12/30/2021 as GHSA-p3rp-vmj9-gv6v. The advisory is shared for download at github.com. This vulnerability is handled as CVE-2021-43861 since 11/16/2021. 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 8.13.8 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 066b7a0d0bda274d94a2f2d21e4323dab5776d83 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.8
VulDB Meta Temp Score: 4.7

VulDB Base Score: 2.4
VulDB Temp Score: 2.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

CNA Base Score: 7.2
CNA Vector (GitHub, Inc.): 🔍

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: Mermaid 8.13.8
Patch: 066b7a0d0bda274d94a2f2d21e4323dab5776d83

Timelineinfo

11/16/2021 🔍
12/30/2021 +44 days 🔍
12/30/2021 +0 days 🔍
01/05/2022 +6 days 🔍

Sourcesinfo

Advisory: GHSA-p3rp-vmj9-gv6v
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2021-43861 (🔍)
GCVE (CVE): GCVE-0-2021-43861
GCVE (VulDB): GCVE-100-189452

Entryinfo

Created: 12/30/2021 17:39
Updated: 01/05/2022 06:57
Changes: 12/30/2021 17:39 (52), 01/05/2022 06:47 (2), 01/05/2022 06:57 (1)
Complete: 🔍
Cache ID: 216::103

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