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Gon gem lack of escaping certain input when outputting as JSON

Moderate severity GitHub Reviewed Published Apr 30, 2021 to the GitHub Advisory Database • Updated Aug 29, 2023

Package

bundler gon (RubyGems)

Affected versions

< 6.4.0

Patched versions

6.4.0

Description

An issue was discovered in the gon gem before gon-6.4.0 for Ruby. MultiJson does not honor the escape_mode parameter to escape fields as an XSS protection mechanism. To mitigate, json_dumper.rb in gon now does escaping for XSS by default without relying on MultiJson.

References

Published by the National Vulnerability Database Sep 23, 2020
Reviewed Apr 28, 2021
Published to the GitHub Advisory Database Apr 30, 2021
Last updated Aug 29, 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
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:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS score

0.610%
(79th percentile)

Weaknesses

CVE ID

CVE-2020-25739

GHSA ID

GHSA-78vq-9j56-wrfr

Source code

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