Vulnerability · Published Sep 21, 2021 · Assigned by GitHub_M
CVE-2021-41084Response Splitting from unsanitized headers in http4s
High 8.7
In plain English
A high-severity server-side request forgery in http4s from http4s. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.2% (higher than 69% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Maven | org.http4s:http4s-client_2.12 | 0.21.29 | GHSA-5vcm-3xc3-w7x3 |
| Maven | org.http4s:http4s-client_2.12 | 0.22.5 | GHSA-5vcm-3xc3-w7x3 |
| Maven | org.http4s:http4s-client_2.12 | 0.23.4 | GHSA-5vcm-3xc3-w7x3 |
| Maven | org.http4s:http4s-client_2.13 | 0.21.29 | GHSA-5vcm-3xc3-w7x3 |
| Maven | org.http4s:http4s-client_2.13 | 0.22.5 | GHSA-5vcm-3xc3-w7x3 |
| Maven | org.http4s:http4s-client_2.13 | 0.23.4 | GHSA-5vcm-3xc3-w7x3 |
| Maven | org.http4s:http4s-client_3 | 0.21.29 | GHSA-5vcm-3xc3-w7x3 |
| Maven | org.http4s:http4s-client_3 | 0.22.5 | GHSA-5vcm-3xc3-w7x3 |
| Maven | org.http4s:http4s-client_3 | 0.23.4 | GHSA-5vcm-3xc3-w7x3 |
| Maven | org.http4s:http4s-server_2.10 | no fix listed | GHSA-5vcm-3xc3-w7x3 |
| Maven | org.http4s:http4s-server_2.11 | no fix listed | GHSA-5vcm-3xc3-w7x3 |
| Maven | org.http4s:http4s-server_2.12 | 0.21.29 | GHSA-5vcm-3xc3-w7x3 |
| Maven | org.http4s:http4s-server_2.12 | 0.22.5 | GHSA-5vcm-3xc3-w7x3 |
| Maven | org.http4s:http4s-server_2.12 | 0.23.4 | GHSA-5vcm-3xc3-w7x3 |
| Maven | org.http4s:http4s-server_2.13 | 0.21.29 | GHSA-5vcm-3xc3-w7x3 |
| Maven | org.http4s:http4s-server_2.13 | 0.22.5 | GHSA-5vcm-3xc3-w7x3 |
| Maven | org.http4s:http4s-server_2.13 | 0.23.4 | GHSA-5vcm-3xc3-w7x3 |
| Maven | org.http4s:http4s-server_2.13.0-M5 | no fix listed | GHSA-5vcm-3xc3-w7x3 |
| Maven | org.http4s:http4s-server_3 | 0.22.5 | GHSA-5vcm-3xc3-w7x3 |
| Maven | org.http4s:http4s-server_3 | 0.23.4 | GHSA-5vcm-3xc3-w7x3 |
Affected products (as reported)
Weakness: CWE-918 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N
References
- https://github.com/http4s/http4s/security/advisories/GHSA-5vcm-3xc3-w7x3 x_refsource_CONFIRM
- https://github.com/http4s/http4s/commit/d02007db1da4f8f3df2dbf11f1db9ac7afc3f9d8 x_refsource_MISC
- https://httpwg.org/http-core/draft-ietf-httpbis-semantics-latest.html#fields.values x_refsource_MISC
- https://owasp.org/www-community/attacks/HTTP_Response_Splitting x_refsource_MISC