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Tampering by prototype polution

High
cure53 published GHSA-mmhx-hmjr-r674 Sep 16, 2024

Package

npm dompurify (npm)

Affected versions

<2.5.4
<3.1.3

Patched versions

2.5.4
3.1.3

Description

It has been discovered that malicious HTML using special nesting
techniques can bypass the depth checking added to DOMPurify in recent
releases. It was also possible to use Prototype Pollution to weaken the
depth check.

This renders dompurify unable to avoid XSS attack.

Fixed by 1e52026 (3.x branch) and 26e1d69 (2.x branch).

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
High
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
Low
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:H/PR:N/UI:N/S:U/C:L/I:H/A:L

CVE ID

CVE-2024-45801

Weaknesses

Credits