Summary
Loofah < 2.19.1 contains 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 Loofah >= 2.19.1.
Severity
The Loofah maintainers have evaluated this as High Severity 7.5 (CVSS3.1).
References
- CWE – CWE-1333: Inefficient Regular Expression Complexity (4.9)
- https://hackerone.com/reports/1684163
Credit
This vulnerability was responsibly reported by @ooooooo-q (https://github.com/ooooooo-q).
References
- https://github.com/flavorjones/loofah/security/advisories/GHSA-486f-hjj9-9vhh
- https://github.com/flavorjones/loofah/commit/a6e0a1ab90675a17b1b2be189129d94139e4b143
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/loofah/CVE-2022-23514.yml
- https://nvd.nist.gov/vuln/detail/CVE-2022-23514
- https://hackerone.com/reports/1684163
- https://github.com/advisories/GHSA-486f-hjj9-9vhh