GHSA-9p57-h987-4vgx

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Source
https://github.com/advisories/GHSA-9p57-h987-4vgx
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2024/05/GHSA-9p57-h987-4vgx/GHSA-9p57-h987-4vgx.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-9p57-h987-4vgx
Aliases
Published
2024-05-01T16:37:21Z
Modified
2024-05-03T20:34:41.823682Z
Severity
  • 7.1 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N CVSS Calculator
Summary
Phlex vulnerable to Cross-site Scripting (XSS) via maliciously formed HTML attribute names and values
Details

There is a potential cross-site scripting (XSS) vulnerability that can be exploited via maliciously crafted user data.

The reason these issues were not detected before is the escapes were working as designed. However, their design didn't take into account just how recklessly permissive browser are when it comes to executing unsafe JavaScript via HTML attributes.

Impact

If you render an <a> tag with an href attribute set to a user-provided link, that link could potentially execute JavaScript when clicked by another user.

a(href: user_profile) { "Profile" }

If you splat user-provided attributes when rendering any HTML or SVG tag, malicious event attributes could be included in the output, executing JavaScript when the events are triggered by another user.

h1(**JSON.parse(user_attributes))

Patches

Patches are available on RubyGems for all minor versions released in the last year.

If you are on main, it has been patched since da8f943

Workarounds

Configuring a Content Security Policy that does not allow unsafe-inline would effectively prevent this vulnerability from being exploited.

References

In addition to upgrading to a patched version of Phlex, we strongly recommend configuring a Content Security Policy header that does not allow unsafe-inline. Here’s how you can configure a Content Security Policy header in Rails. https://guides.rubyonrails.org/security.html#content-security-policy-header

Database specific 
{
    "nvd_published_at": "2024-04-30T23:15:06Z",
    "cwe_ids": [
        "CWE-79"
    ],
    "severity": "HIGH",
    "github_reviewed": true,
    "github_reviewed_at": "2024-05-01T16:37:21Z"
}
References

Affected packages

RubyGems / phlex

Package

Name
phlex
Purl
pkg:gem/phlex

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1.9.3

Affected versions

0.*

0.1.0
0.2.0
0.2.1
0.2.2
0.3.0
0.3.1
0.3.2
0.4.0
0.5.0
0.5.1
0.5.2
0.5.3

1.*

1.0.0.rc1
1.0.0.rc2
1.0.0
1.0.1
1.1.0
1.1.1
1.2.0
1.2.1
1.2.2
1.3.0
1.3.1
1.3.2
1.3.3
1.4.0
1.4.1
1.4.2
1.5.0
1.5.1
1.5.2
1.5.3
1.6.0
1.6.1
1.6.2
1.6.3
1.7.0
1.7.1
1.7.2
1.8.0
1.8.1
1.8.2
1.8.3
1.9.0
1.9.1
1.9.2

RubyGems / phlex

Package

Name
phlex
Purl
pkg:gem/phlex

Affected ranges

Type
ECOSYSTEM
Events
Introduced
1.10.0
Fixed
1.10.2

Affected versions

1.*

1.10.0
1.10.1