CVE-2024-38527 – @zenuml/core

Package

Manager: npm
Name: @zenuml/core
Vulnerable Version: >=0 <3.23.25

Severity

Level: Medium

CVSS v3.1: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N

CVSS v4.0: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

EPSS: 0.00131 pctl0.33461

Details

Cross-site Scripting in ZenUML ### Summary Markdown-based comments in the ZenUML diagram syntax are susceptible to Cross-site Scripting (XSS). ### Details The comment feature allows the user to attach small notes for reference. This feature allows the user to enter in their comment in markdown comment, allowing them to use common markdown features, such as `**` for bolded text. However, the markdown text is currently not sanitized before rendering, allowing an attacker to enter a malicious payload for the comment which leads to XSS. https://github.com/mermaid-js/zenuml-core/blob/dcfee8cde42673c09e19401f43ad8506658c8442/src/components/DiagramFrame/SeqDiagram/MessageLayer/Block/Statement/Comment/Comment.vue#L65 ### PoC ``` // p<img onerror=alert(1) src=""/> A->B:hi ``` Above is a POC diagram payload that results in an XSS. Here is a similar POC in mermaid.live: https://mermaid.live/edit#pako:eNpNjrFuwyAQhl8F3dRK1DaQGhs1kVq1Y6duFQsylwTVgEWw1MTyuxc5S7df39399y0wRIug4IZh9qMOdU2mF-dPJAZMKaa9GTHlB_ZILmnYa9BQH3R4fTq8qbMDCh6TN86WhkUHQjTkM3rUoEq0Jv2Ui7CWPTPn-HUNA6icZqQwT9ZkfHfmlIwHdTTjpVC0Lsf0eVfazChMJoBa4BdUL6uGC8n7TrCGd5zCFRRnXbVjvBVNK3gJXbtSuMVYSlnFC-Kyf961UshWbmXf2-y_xcf29c7WP2yrVC0 ### Impact This puts existing applications that use ZenUML **unsandboxed** at risk of arbitrary JavaScript execution when rendering user-controlled diagrams.

Metadata

Created: 2024-06-26T19:03:54Z
Modified: 2024-06-26T21:56:14Z
Source: https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2024/06/GHSA-q6xv-jm4v-349h/GHSA-q6xv-jm4v-349h.json
CWE IDs: ["CWE-79", "CWE-80"]
Alternative ID: GHSA-q6xv-jm4v-349h
Finding: F425
Auto approve: 1