CVE-2020-4054
In Sanitize (RubyGem sanitize) greater than or equal to 3.0.0 and less than 5.2.1, there is a cross-site scripting vulnerability.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.85%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
In Sanitize (RubyGem sanitize) greater than or equal to 3.0.0 and less than 5.2.1, there is a cross-site scripting vulnerability. When HTML is sanitized using Sanitize's "relaxed" config, or a custom config that allows certain elements, some content in a math or svg element may not be sanitized correctly even if math and svg are not in the allowlist. You are likely to be vulnerable to this issue if you use Sanitize's relaxed config or a custom config that allows one or more of the following HTML elements: iframe, math, noembed, noframes, noscript, plaintext, script, style, svg, xmp. Using carefully crafted input, an attacker may be able to sneak arbitrary HTML through Sanitize, potentially resulting in XSS (cross-site scripting) or other undesired behavior when that HTML is rendered in a browser. This has been fixed in 5.2.1.
- CVSS 3.1
- 7.3 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
- EPSS
- 1.85% probability · 78th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-79
- Affected
- sanitize project/sanitize
- Source
- security-advisories@github.com
References
- https://github.com/rgrove/sanitize/commit/a11498de9e283cd457b35ee252983662f7452aa9Patch, Third Party Advisory
- https://github.com/rgrove/sanitize/releases/tag/v5.2.1Release Notes, Third Party Advisory
- https://github.com/rgrove/sanitize/security/advisories/GHSA-p4x4-rw2p-8j8mThird Party Advisory
- https://usn.ubuntu.com/4543-1/
- https://www.debian.org/security/2020/dsa-4730
- https://github.com/rgrove/sanitize/commit/a11498de9e283cd457b35ee252983662f7452aa9Patch, Third Party Advisory
- https://github.com/rgrove/sanitize/releases/tag/v5.2.1Release Notes, Third Party Advisory
- https://github.com/rgrove/sanitize/security/advisories/GHSA-p4x4-rw2p-8j8mThird Party Advisory
- https://usn.ubuntu.com/4543-1/
- https://www.debian.org/security/2020/dsa-4730
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.