Vulnerabilities in pkg:gem/gon

PACKAGE
Advisory Identifier: GHSA-78vq-9j56-wrfr
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Advisory Summary

CVE-2020-25739 is a MODERATE (CVSS 6.1) gon gem lack of escaping vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting Gon libraries in the RubyGems ecosystem. The issue involves gon gem lack of escaping certain input when outputting as json. Remediation is available by upgrading affected packages to version 6.4.0.

1 Known Advisory Record(s)
Package Vulnerability Intelligence

pkg:gem/gon

1 Known Advisory Record(s)

Vulnerability advisories affecting package pkg:gem/gon. Select an advisory below to view technical details or fixes.

Advisory ID CVE / NVD Severity Summary
GHSA-78vq-9j56-wrfr CVE-2020-25739 MODERATE Gon gem lack of escaping certain input when outputting as JSON

CVE-2020-25739 at a Glance

CVE Identifier CVE-2020-25739
GHSA Identifier GHSA-78vq-9j56-wrfr
Severity MODERATE
CVSS v3.1 Base Score 6.1
CWE Classification CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Product Gon
Package Ecosystem RubyGems
Published Date
Last Updated

Security Impact

CVSS: 6.1

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction Required (UI:R)
Scope Changed (S:C)
Confidentiality Low (C:L)
Integrity Low (I:L)
Availability None (A:N)

How to Fix CVE-2020-25739

To remediate this vulnerability, upgrade all affected Gon dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

gon fixed: 6.4.0 
Upgrade gon to 6.4.0
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for gon

How to Check if You Are Affected

To determine whether your application is affected by CVE-2020-25739, inspect your project dependencies for Gon:

inspect dependencies for gon

Analyze the terminal output to locate any version of Gon in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 6.4.0), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'), where the product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. In Gon, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

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.

CVE-2020-25739 Affected Gon Versions

1 component(s)
Fixed Versions:
6.4.0
Product / Package Ecosystem Affected Versions Fixed Version
gon
gem/gon
RubyGems
< 6.4.0
6.4.0

References

NVD — CVE-2020-25739 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-25739
Security Fix Commit FIX COMMIT
https://github.com/gazay/gon/commit/fe3c7b2191a992386dc9edd37de5447a4e809bc7
Gon Source Repository REPOSITORY
https://github.com/gazay/gon
Gon Source Repository REPOSITORY
https://github.com/rubysec/ruby-advisory-db/blob/master/gems/gon/CVE-2020-25739.yml
lists.debian.org/debian-lts-announce... WEB
https://lists.debian.org/debian-lts-announce/2020/09/msg00018.html
usn.ubuntu.com/4560-1 WEB
https://usn.ubuntu.com/4560-1

Frequently Asked Questions

What is CVE-2020-25739?
CVE-2020-25739 is a security vulnerability in Gon involving Gon gem lack of escaping certain input when outputting as JSON under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').
Which Gon versions are affected?
Affected versions include releases prior to 6.4.0 across affected packages: gon.
What version fixes CVE-2020-25739?
Upgrading to 6.4.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is gon affected?
Yes, gon is affected in releases prior to 6.4.0. Upgrade your dependency to 6.4.0 or later.
What is the CVSS score of CVE-2020-25739?
CVE-2020-25739 has a CVSS v3.1 base score of 6.1 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
What CWE is associated with CVE-2020-25739?
CVE-2020-25739 is classified under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') (The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.).
How can I check RubyGems dependencies for CVE-2020-25739?
Run the dependency tree command: 'inspect dependencies for gon'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-78vq-9j56-wrfr",
  "modified" : "2023-08-29T12:13:04Z",
  "published" : "2021-04-30T17:29:15Z",
  "aliases" : [ "CVE-2020-25739" ],
  "summary" : "Gon gem lack of escaping certain input when outputting as JSON",
  "details" : "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.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "RubyGems",
      "name" : "gon"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "6.4.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-25739"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/gazay/gon/commit/fe3c7b2191a992386dc9edd37de5447a4e809bc7"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/gazay/gon"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/rubysec/ruby-advisory-db/blob/master/gems/gon/CVE-2020-25739.yml"
  }, {
    "type" : "WEB",
    "url" : "https://lists.debian.org/debian-lts-announce/2020/09/msg00018.html"
  }, {
    "type" : "WEB",
    "url" : "https://usn.ubuntu.com/4560-1"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-04-28T15:05:22Z",
    "nvd_published_at" : "2020-09-23T14:15:00Z"
  }
}