CVE-2023-36823
Sanitize vulnerable to Cross-site Scripting via insufficient neutralization of `style` element content
Impact
### Impact Using carefully crafted input, an attacker may be able to sneak arbitrary HTML and CSS through Sanitize `>= 3.0.0, < 6.0.2` when Sanitize is configured to use the built-in "relaxed" config or when using a custom config that allows `style` elements and one or more CSS at-rules. This could result in XSS (cross-site scripting) or other undesired behavior when the malicious HTML and CSS are rendered in a browser. ### Patches Sanitize `>= 6.0.2` performs additional escaping of CSS in `style` element content, which fixes this issue. ### Workarounds Users who are unable to upgrade can prevent this issue by using a Sanitize config that doesn't allow `style` elements, using a Sanitize config that doesn't allow CSS at-rules, or by manually escaping the character sequence `</` as `<\/` in `style` element content. ### Credit This issue was found by @cure53 during an audit of a project that uses Sanitize and was reported by one of that project's maintainers. Thank you!
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| rubygems | sanitize | >= 3.0.0, < 6.0.2 | 6.0.2 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Sanitize Project | Sanitize | from 3.0.0 before 6.0.2 |
| Debian | Debian Linux | Version 10.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/rgrove/sanitize/commit/76ed46e6dc70820f38efe27de8dabd54dddb5220
- https://github.com/rgrove/sanitize/releases/tag/v6.0.2
- https://github.com/rgrove/sanitize/security/advisories/GHSA-f5ww-cq3m-q3g7
- https://lists.debian.org/debian-lts-announce/2023/11/msg00008.html
- https://github.com/advisories/GHSA-f5ww-cq3m-q3g7
- https://nvd.nist.gov/vuln/detail/CVE-2023-36823
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/sanitize/CVE-2023-36823.yml