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kiwitcms vulnerable to stored XSS via unrestricted files upload

Moderate severity GitHub Reviewed Published May 21, 2023 in kiwitcms/Kiwi • Updated Nov 7, 2023

Package

pip kiwitcms (pip)

Affected versions

< 12.3

Patched versions

12.3

Description

Impact

Kiwi TCMS allows users to upload attachments to test plans, test cases, etc. Earlier versions of Kiwi TCMS had introduced upload validators in order to prevent potentially dangerous files from being uploaded, see GHSA-fwcf-753v-fgcj and Content-Security-Policy definition to prevent cross-site-scripting attacks, see GHSA-2wcr-87wf-cf9j.

The upload validation checks were not robust enough which left the possibility of an attacker to circumvent them and upload a potentially dangerous file. Exploting this flaw a combination of files could be uploaded so that they work together to circumvent the existing Content-Security-Policy and allow execution of arbitrary JavaScript in the browser.

Patches

  • File upload validation code has been improved
  • Kiwi TCMS will now force Content-Type: text/plain when serving uploaded files

Workarounds

  1. Force the Content-Type header via a custom Django middleware, see ExtraHeadersMiddleware in https://github.com/kiwitcms/Kiwi/blob/master/tcms/core/middleware.py#L23 and/or
  2. Force the Content-Type header via Nginx overrides, see location /uploads/ in https://github.com/kiwitcms/Kiwi/blob/master/etc/nginx.conf

References

Disclosed by Antonio Spataro and ek1ng. Additional credits to Ahmed Rabeaa Mosa.

References

@atodorov atodorov published to kiwitcms/Kiwi May 21, 2023
Published to the GitHub Advisory Database May 22, 2023
Reviewed May 22, 2023
Published by the National Vulnerability Database May 27, 2023
Last updated Nov 7, 2023

Severity

Moderate

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
Changed
Confidentiality
Low
Integrity
Low
Availability
None

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:C/C:L/I:L/A:N

EPSS score

0.074%
(34th percentile)

Weaknesses

CVE ID

CVE-2023-32686

GHSA ID

GHSA-x7c2-7wvg-jpx7

Source code

Credits

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