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Bypassing Cross-Site Scripting Protection in TYPO3 HTML Sanitizer

Moderate severity GitHub Reviewed Published Nov 14, 2023 in TYPO3/html-sanitizer • Updated Nov 15, 2023

Package

composer typo3/html-sanitizer (Composer)

Affected versions

>= 1.0.0, <= 1.5.2
>= 2.0.0, <= 2.1.3

Patched versions

1.5.3
2.1.4

Description

CVSS: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N/E:F/RL:O/RC:C (4.4)

Problem

DOM processing instructions are not handled correctly. This allows bypassing the cross-site scripting mechanism of typo3/html-sanitizer.

Solution

Update to typo3/html-sanitizer versions 1.5.3 or 2.1.4 that fix the problem described.

Credits

Thanks to Yaniv Nizry and Niels Dossche who reported this issue, and to TYPO3 core & security team member Oliver Hader who fixed the issue.

References

References

@ohader ohader published to TYPO3/html-sanitizer Nov 14, 2023
Published by the National Vulnerability Database Nov 14, 2023
Published to the GitHub Advisory Database Nov 14, 2023
Reviewed Nov 14, 2023
Last updated Nov 15, 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
High
Privileges required
None
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:H/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS score

0.101%
(43rd percentile)

Weaknesses

CVE ID

CVE-2023-47125

GHSA ID

GHSA-mm79-jhqm-9j54

Source code

Credits

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