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Kiwi TCMS Stored Cross-site Scripting via SVG file

High severity GitHub Reviewed Published Mar 29, 2023 in kiwitcms/Kiwi • Updated Apr 6, 2023

Package

pip kiwitcms (pip)

Affected versions

< 12.1

Patched versions

12.1

Description

Impact

Kiwi TCMS accepts SVG files uploaded by users which could potentially contain JavaScript code. If SVG images are viewed directly, i.e. not rendered in an HTML page, this JavaScript code could execute.

Patches

This vulnerability has been fixed by configuring Kiwi TCMS to serve with the Content-Security-Policy HTTP header which blocks inline JavaScript in all modern browsers.

Workarounds

Configure Content-Security-Policy header, see commit 6617cee0.

References

You can visit https://digi.ninja/blog/svg_xss.php for more technical details.

Independently disclosed by Antonio Spataro and @1d8.

References

@atodorov atodorov published to kiwitcms/Kiwi Mar 29, 2023
Published by the National Vulnerability Database Mar 29, 2023
Published to the GitHub Advisory Database Mar 30, 2023
Reviewed Mar 30, 2023
Last updated Apr 6, 2023

Severity

High

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
Low

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:L

EPSS score

0.054%
(24th percentile)

Weaknesses

CVE ID

CVE-2023-27489

GHSA ID

GHSA-2wcr-87wf-cf9j

Source code

Credits

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