Vulnerability · Published Jul 6, 2023 · Assigned by GitHub_M
CVE-2023-36823Sanitize vulnerable to Cross-site Scripting via insufficient neutralization of `style` element content
High 7.1
In plain English
A high-severity cross-site scripting in sanitize from rgrove. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 54% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Sanitize is an allowlist-based HTML and CSS sanitizer. Using carefully crafted input, an attacker may be able to sneak arbitrary HTML and CSS through Sanitize starting with version 3.0.0 and prior to version 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 cross-site scripting or other undesired behavior when the malicious HTML and CSS are rendered in a browser. Sanitize 6.0.2 performs additional escaping of CSS in `style` element content, which fixes this issue. 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | ruby-sanitize | 6.0.0-1.1+deb12u1 | DEBIAN-CVE-2023-36823 |
| Debian:12 | ruby-sanitize | 6.0.0-1.1+deb12u1 | DSA-5616-1 |
| Debian:13 | ruby-sanitize | 6.0.2-1 | DEBIAN-CVE-2023-36823 |
| Debian:14 | ruby-sanitize | 6.0.2-1 | DEBIAN-CVE-2023-36823 |
| RubyGems | sanitize | 6.0.2 | GHSA-f5ww-cq3m-q3g7 |
| Ubuntu:22.04:LTS | ruby-sanitize | 6.0.0-1ubuntu0.1 | USN-6748-1 |
| Ubuntu:22.04:LTS | ruby-sanitize | 6.0.0-1ubuntu0.1 | UBUNTU-CVE-2023-36823 |
Affected products (as reported)
Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
References
- https://github.com/rgrove/sanitize/security/advisories/GHSA-f5ww-cq3m-q3g7 x_refsource_CONFIRM
- https://github.com/rgrove/sanitize/commit/76ed46e6dc70820f38efe27de8dabd54dddb5220 x_refsource_MISC
- https://github.com/rgrove/sanitize/releases/tag/v6.0.2 x_refsource_MISC
- https://lists.debian.org/debian-lts-announce/2023/11/msg00008.html