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Cross-site Scripting in loofah

Moderate severity GitHub Reviewed Published Mar 21, 2018 to the GitHub Advisory Database • Updated Jul 5, 2023

Package

bundler loofah (RubyGems)

Affected versions

< 2.2.1

Patched versions

2.2.1
bundler nokogiri (RubyGems)
< 1.8.3
1.8.3

Description

Loofah allows non-whitelisted attributes to be present in sanitized output when input with specially-crafted HTML fragments.

Users are affected if running Loofah < 2.2.1, but only:

  • when running on MRI or RBX,
  • in combination with libxml2 >= 2.9.2.

JRuby users are not affected.

References

Published to the GitHub Advisory Database Mar 21, 2018
Reviewed Jun 16, 2020
Last updated Jul 5, 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:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS score

0.208%
(59th percentile)

Weaknesses

CVE ID

CVE-2018-8048

GHSA ID

GHSA-x7rv-cr6v-4vm4

Source code

Credits

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