CVE-2020-4054
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.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
Debian Fixed 5 releases
| Version | Status | Fixed in |
|---|---|---|
| trixie | Fixed | 4.6.6-2.1 |
| sid | Fixed | 4.6.6-2.1 |
| forky | Fixed | 4.6.6-2.1 |
| bullseye | Fixed | 4.6.6-2.1 |
| bookworm | Fixed | 4.6.6-2.1 |
References
- https://github.com/rgrove/sanitize/security/advisories/GHSA-p4x4-rw2p-8j8m
- https://nvd.nist.gov/vuln/detail/CVE-2020-4054
- https://github.com/rgrove/sanitize/commit/a11498de9e283cd457b35ee252983662f7452aa9
- https://github.com/rgrove/sanitize
- https://github.com/rgrove/sanitize/releases/tag/v5.2.1
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/sanitize/CVE-2020-4054.yml
- https://usn.ubuntu.com/4543-1
- https://www.debian.org/security/2020/dsa-4730
- https://security-tracker.debian.org/tracker/CVE-2020-4054
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.