CVE-2022-23517 — Inefficient Regular Expression Complexity in rails-html-sanitizer

Affected: rails-html-sanitizer

rails-html-sanitizer is responsible for sanitizing HTML fragments in Rails applications. Certain configurations of rails-html-sanitizer < 1.4.4 use an inefficient regular expression that is susceptible to excessive backtracking when attempting to sanitize certain SVG attributes. This may lead to a denial of service through CPU resource consumption. This issue has been patched in version 1.4.4.

GHSA-5x79-w82f-gw8w — Inefficient Regular Expression Complexity in rails-html-sanitizer

Affected: RubyGems: rails-html-sanitizer

## Summary

Certain configurations of rails-html-sanitizer `< 1.4.4` use an inefficient regular expression that is susceptible to excessive backtracking when attempting to sanitize certain SVG attributes. This may lead to a denial of service through CPU resource consumption.

## Mitigation

Upgrade to rails-html-sanitizer `>= 1.4.4`.

## Severity

The maintainers have evaluated this as [High Severity 7.5 (CVSS3.1)](https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

## References

- [CWE - CWE-1333: Inefficient Regular Expression Complexity (4.9)](https://cwe.mitre.org/data/definitions/1333.html) - https://hackerone.com/reports/1684163

## Credit

This vulnerability was responsibly reported by @ooooooo-q (https://github.com/ooooooo-q).

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CVE-2022-23517 — Inefficient Regular Expression Complexity in rails-html-sanitizer

GHSA-5x79-w82f-gw8w — Inefficient Regular Expression Complexity in rails-html-sanitizer