ghsa-rrfc-7g8p-99q8
Vulnerability from github
Summary
There is a possible XSS vulnerability with certain configurations of Rails::Html::Sanitizer. This is due to an incomplete fix of CVE-2022-32209.
- Versions affected: ALL
- Not affected: NONE
- Fixed versions: 1.4.4
Impact
A possible XSS vulnerability with certain configurations of Rails::Html::Sanitizer may allow an attacker to inject content if the application developer has overridden the sanitizer's allowed tags to allow both "select" and "style" elements.
Code is only impacted if allowed tags are being overridden using either of the following two mechanisms:
- Using the Rails configuration
config.action_view.sanitized_allow_tags=
:
ruby
# In config/application.rb
config.action_view.sanitized_allowed_tags = ["select", "style"]
(see https://guides.rubyonrails.org/configuring.html#configuring-action-view)
- Using the class method
Rails::Html::SafeListSanitizer.allowed_tags=
:
ruby
# class-level option
Rails::Html::SafeListSanitizer.allowed_tags = ["select", "style"]
All users overriding the allowed tags by either of the above mechanisms to include both "select" and "style" should either upgrade or use one of the workarounds immediately.
NOTE: Code is not impacted if allowed tags are overridden using either of the following mechanisms:
- the
:tags
option to the Action View helper methodsanitize
. - the
:tags
option to the instance methodSafeListSanitizer#sanitize
.
Workarounds
Remove either "select" or "style" from the overridden allowed tags.
References
- CWE - CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') (4.9)
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-32209
- https://hackerone.com/reports/1654310
Credit
This vulnerability was responsibly reported by Dominic Breuker.
{ "affected": [ { "package": { "ecosystem": "RubyGems", "name": "rails-html-sanitizer" }, "ranges": [ { "events": [ { "introduced": "0" }, { "fixed": "1.4.4" } ], "type": "ECOSYSTEM" } ] } ], "aliases": [ "CVE-2022-23520" ], "database_specific": { "cwe_ids": [ "CWE-79" ], "github_reviewed": true, "github_reviewed_at": "2022-12-13T17:51:40Z", "nvd_published_at": "2022-12-14T18:15:00Z", "severity": "MODERATE" }, "details": "## Summary\n\nThere is a possible XSS vulnerability with certain configurations of Rails::Html::Sanitizer. This is due to an incomplete fix of CVE-2022-32209.\n\n- Versions affected: ALL\n- Not affected: NONE\n- Fixed versions: 1.4.4\n\n\n## Impact\n\nA possible XSS vulnerability with certain configurations of Rails::Html::Sanitizer may allow an attacker to inject content if the application developer has overridden the sanitizer\u0027s allowed tags to allow both \"select\" and \"style\" elements.\n\nCode is only impacted if allowed tags are being overridden using either of the following two mechanisms:\n\n1. Using the Rails configuration `config.action_view.sanitized_allow_tags=`:\n\n ```ruby\n # In config/application.rb\n config.action_view.sanitized_allowed_tags = [\"select\", \"style\"]\n ```\n\n (see https://guides.rubyonrails.org/configuring.html#configuring-action-view)\n\n2. Using the class method `Rails::Html::SafeListSanitizer.allowed_tags=`:\n\n ```ruby\n # class-level option\n Rails::Html::SafeListSanitizer.allowed_tags = [\"select\", \"style\"]\n ```\n\nAll users overriding the allowed tags by either of the above mechanisms to include both \"select\" and \"style\" should either upgrade or use one of the workarounds immediately.\n\nNOTE: Code is _not_ impacted if allowed tags are overridden using either of the following mechanisms:\n\n- the `:tags` option to the Action View helper method `sanitize`.\n- the `:tags` option to the instance method `SafeListSanitizer#sanitize`.\n\n\n## Workarounds\n\nRemove either \"select\" or \"style\" from the overridden allowed tags.\n\n\n## References\n\n- [CWE - CWE-79: Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027) (4.9)](https://cwe.mitre.org/data/definitions/79.html)\n- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-32209\n- https://hackerone.com/reports/1654310\n\n\n## Credit\n\nThis vulnerability was responsibly reported by Dominic Breuker.\n", "id": "GHSA-rrfc-7g8p-99q8", "modified": "2022-12-17T00:32:44Z", "published": "2022-12-13T17:51:40Z", "references": [ { "type": "WEB", "url": "https://github.com/rails/rails-html-sanitizer/security/advisories/GHSA-rrfc-7g8p-99q8" }, { "type": "ADVISORY", "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-23520" }, { "type": "WEB", "url": "https://hackerone.com/reports/1654310" }, { "type": "PACKAGE", "url": "https://github.com/rails/rails-html-sanitizer" }, { "type": "WEB", "url": "https://github.com/rubysec/ruby-advisory-db/blob/master/gems/rails-html-sanitizer/CVE-2022-23520.yml" }, { "type": "WEB", "url": "https://lists.debian.org/debian-lts-announce/2023/09/msg00012.html" } ], "schema_version": "1.4.0", "severity": [ { "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "type": "CVSS_V3" } ], "summary": "Possible XSS vulnerability with certain configurations of rails-html-sanitizer" }
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.