Vulnerability Description
http4s is an open source scala interface for HTTP. In affected versions http4s is vulnerable to response-splitting or request-splitting attacks when untrusted user input is used to create any of the following fields: Header names (`Header.name`å), Header values (`Header.value`), Status reason phrases (`Status.reason`), URI paths (`Uri.Path`), URI authority registered names (`URI.RegName`) (through 0.21). This issue has been resolved in versions 0.21.30, 0.22.5, 0.23.4, and 1.0.0-M27 perform the following. As a matter of practice http4s services and client applications should sanitize any user input in the aforementioned fields before returning a request or response to the backend. The carriage return, newline, and null characters are the most threatening.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Typelevel | Http4S | < 0.21.29 |
Related Weaknesses (CWE)
References
- https://github.com/http4s/http4s/commit/d02007db1da4f8f3df2dbf11f1db9ac7afc3f9d8PatchThird Party Advisory
- https://github.com/http4s/http4s/security/advisories/GHSA-5vcm-3xc3-w7x3ExploitThird Party Advisory
- https://httpwg.org/http-core/draft-ietf-httpbis-semantics-latest.html#fields.valVendor Advisory
- https://owasp.org/www-community/attacks/HTTP_Response_SplittingThird Party Advisory
- https://github.com/http4s/http4s/commit/d02007db1da4f8f3df2dbf11f1db9ac7afc3f9d8PatchThird Party Advisory
- https://github.com/http4s/http4s/security/advisories/GHSA-5vcm-3xc3-w7x3ExploitThird Party Advisory
- https://httpwg.org/http-core/draft-ietf-httpbis-semantics-latest.html#fields.valVendor Advisory
- https://owasp.org/www-community/attacks/HTTP_Response_SplittingThird Party Advisory
FAQ
What is CVE-2021-41084?
CVE-2021-41084 is a vulnerability with a CVSS score of 8.7 (HIGH). http4s is an open source scala interface for HTTP. In affected versions http4s is vulnerable to response-splitting or request-splitting attacks when untrusted user input is used to create any of the f...
How severe is CVE-2021-41084?
CVE-2021-41084 has been rated HIGH with a CVSS base score of 8.7/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-41084?
Check the references section above for vendor advisories and patch information. Affected products include: Typelevel Http4S.