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CVE-2021-39185— Default CORS config allows any origin with credentials

Quick assessment

Affected
http4s http4s
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

http4s是一款开源的用于Scala的流HTTP服务器。 Http4s 存在访问控制错误漏洞，该漏洞源于默认 CORS 配置容易受到源反射攻击。以下产品和版本受到影响：0.21.26 及更早版本、0.22.0 到 0.22.2、0.23.0、0.23.1 和 1.0.0-M1 到 1.0.0-M24。

CVSS 9.1 · Critical EPSS 0.59% · P46
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I. Basic Information for CVE-2021-39185

Vulnerability Information
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Vulnerability Title
Default CORS config allows any origin with credentials
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
源验证错误
Source: CVE Program / CVE List V5
Vulnerability Title
Http4s访问控制错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
http4s是一款开源的用于Scala的流HTTP服务器。 Http4s 存在访问控制错误漏洞，该漏洞源于默认 CORS 配置容易受到源反射攻击。以下产品和版本受到影响：0.21.26 及更早版本、0.22.0 到 0.22.2、0.23.0、0.23.1 和 1.0.0-M1 到 1.0.0-M24。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
http4s http4s < 0.21.27 -

II. Public POCs for CVE-2021-39185

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III. Intelligence Information for CVE-2021-39185

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Vendor Advisories for CVE-2021-39185 (1)

Other References for CVE-2021-39185 (1)

IV. Related Vulnerabilities

Same product: http4s
Same vendor: http4s
Same weakness: CWE-346

V. Comments for CVE-2021-39185

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