by Kastro
Paper/Archive/CVE-2021-39185

CVE-2021-39185

http4s http4s — Default CORS config allows any origin with credentials

EPSS 0.6%CVSS 9.1
critical.is priorityof 100
37
CVSS 9.1 (CNA)9.1 / 10 × 3027.3Not in CISA KEV+300.0EPSS percentile 48.4.484 × 209.7No public exploit+100.0SSVC exploitation: unknown+100.0
Description · from the CVE record

Http4s is a minimal, idiomatic Scala interface for HTTP services. In http4s versions 0.21.26 and prior, 0.22.0 through 0.22.2, 0.23.0, 0.23.1, and 1.0.0-M1 through 1.0.0-M24, the default CORS configuration is vulnerable to an origin reflection attack. The middleware is also susceptible to a Null Origin Attack. The problem is fixed in 0.21.27, 0.22.3, 0.23.2, and 1.0.0-M25. The original `CORS` implementation and `CORSConfig` are deprecated. See the GitHub GHSA for more information, including code examples and workarounds.

Affected

ProductAffectedFixed inSource
http4s< 0.21.27–CNA
http4s>= 0.22.0, < 0.22.3–CNA
http4s>= 0.23.0, < 0.23.2–CNA
http4s>= 1.0.0-M1, <= 1.0.0-M24–CNA

Scores by source

GitHub_M (CNA)9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

References

refgithub.com/http4s/http4s/security/advisories/GHSA-52cf-226f-rhr6refgithub.com/http4s/http4s/releases/tag/v0.23.2