Description

Squidex is an open source headless CMS and content management hub. In affected versions a stored Cross-Site Scripting (XSS) vulnerability enables privilege escalation of authenticated users. The SVG element filtering mechanism intended to stop XSS attacks through uploaded SVG images, is insufficient resulting to stored XSS attacks. Squidex allows the CMS contributors to be granted the permission of uploading an SVG asset. When the asset is uploaded, a filtering mechanism is performed to validate that the SVG does not contain malicious code. The validation logic consists of traversing the HTML nodes in the DOM. In order for the validation to succeed, 2 conditions must be met: 1. No HTML tags included in a "blacklist" called "InvalidSvgElements" are present. This list only contains the element "script". and 2. No attributes of HTML tags begin with "on" (i.e. onerror, onclick) (line 65). If either of the 2 conditions is not satisfied, validation fails and the file/asset is not uploaded. However it is possible to bypass the above filtering mechanism and execute arbitrary JavaScript code by introducing other HTML elements such as an <iframe> element with a "src" attribute containing a "javascript:" value. Authenticated adversaries with the "assets.create" permission, can leverage this vulnerability to upload a malicious SVG as an asset, targeting any registered user that will attempt to open/view the asset through the Squidex CMS.

Severity

 

CVSS Version 3.x CVSS Version 2.0

CVSS 3.x Severity and Metrics:

CNA:  GitHub, Inc.

Base Score:  5.4 MEDIUM

Vector:  CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

NVD Analysts use publicly available information to associate vector strings and CVSS scores. We also display any CVSS information provided within the CVE List from the CNA.

Note: The NVD and the CNA have provided the same score. When this occurs only the CNA information is displayed, but the Acceptance Level icon for the CNA is given a checkmark to signify NVD concurrence.

CVSS 2.0 Severity and Metrics:

NIST: NVD

Base Score: N/A

NVD assessment not yet provided.

NVD Analysts use publicly available information to associate vector strings and CVSS scores. We also display any CVSS information provided within the CVE List from the CNA.

Note: NVD Analysts have not published a CVSS score for this CVE at this time. NVD Analysts use publicly available information at the time of analysis to associate CVSS vector strings.

References to Advisories, Solutions, and Tools

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Hyperlink	Resource
https://github.com/Squidex/squidex/security/advisories/GHSA-xfr4-qg2v-7v5m	Exploit  Vendor Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-79	Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')	GitHub, Inc.

Known Affected Software Configurations Switch to CPE 2.2

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Change History

2 change records found show changes

Initial Analysis by NIST 11/14/2023 3:07:05 PM

Action	Type	Old Value	New Value
Added	CPE Configuration		OR *cpe:2.3:a:squidex.io:squidex:*:*:*:*:*:*:*:* versions up to (including) 7.8.2
Added	CVSS V3.1		NIST AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Changed	Reference Type	https://github.com/Squidex/squidex/security/advisories/GHSA-xfr4-qg2v-7v5m No Types Assigned	https://github.com/Squidex/squidex/security/advisories/GHSA-xfr4-qg2v-7v5m Exploit, Vendor Advisory

New CVE Received by NIST 11/07/2023 1:15:09 PM

Action	Type	Old Value	New Value
Added	CVSS V3.1		GitHub, Inc. AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Added	CWE		GitHub, Inc. CWE-79
Added	Description		Record truncated, showing 500 of 1449 characters. View Entire Change Record Squidex is an open source headless CMS and content management hub. In affected versions a stored Cross-Site Scripting (XSS) vulnerability enables privilege escalation of authenticated users. The SVG element filtering mechanism intended to stop XSS attacks through uploaded SVG images, is insufficient resulting to stored XSS attacks. Squidex allows the CMS contributors to be granted the permission of uploading an SVG asset. When the asset is uploaded, a filtering mechanism is performed to validate
Added	Reference		GitHub, Inc. https://github.com/Squidex/squidex/security/advisories/GHSA-xfr4-qg2v-7v5m [No types assigned]