CVE-2022-23517
Inefficient Regular Expression Complexity in rails-html-sanitizer
Description
## 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).
How to fix CVE-2022-23517
To remediate CVE-2022-23517, upgrade the affected package to a fixed version below.
- —upgrade to 1.3.0-1+deb11u1 or later
- —upgrade to 1.0.4-1+deb10u2 or later
- —upgrade to 1.3.0-1+deb11u1 or later
- —upgrade to 1.4.4 or later
Is CVE-2022-23517 being exploited?
Low — EPSS is 0.3%, meaning exploitation activity has not been observed at scale.
Affected packages (4)
- from 0, < 1.3.0-1+deb11u1
- from 0, < 1.0.4-1+deb10u2
- from 0, < 1.3.0-1+deb11u1
- from 0, < 1.4.4
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |