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Sanitize vulnerable to Improper Input Validation and Cross-site Scripting

High severity GitHub Reviewed Published Mar 21, 2018 to the GitHub Advisory Database • Updated Jan 23, 2023

Package

bundler sanitize (RubyGems)

Affected versions

>= 3.0.0, < 4.6.3

Patched versions

4.6.3

Description

When Sanitize <= 4.6.2 is used in combination with libxml2 >= 2.9.2, a specially crafted HTML fragment can cause libxml2 to generate improperly escaped output, allowing non-whitelisted attributes to be used on whitelisted elements.

This can allow HTML and JavaScript injection, which could result in XSS if Sanitize's output is served to browsers.

References

Published to the GitHub Advisory Database Mar 21, 2018
Published by the National Vulnerability Database Mar 30, 2018
Reviewed Jun 16, 2020
Last updated Jan 23, 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
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
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:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

EPSS score

0.142%
(50th percentile)

Weaknesses

CVE ID

CVE-2018-3740

GHSA ID

GHSA-7f42-p84j-f58p

Source code

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