CVE-2021-32643 Information

Description

Http4s is a Scala interface for HTTP services. StaticFile.fromUrl can leak the presence of a directory on a server when the URL scheme is not file:// and the URL points to a fetchable resource under its scheme and authority. The function returns F[None] indicating no resource if url.getFile is a directory without first checking the scheme or authority of the URL. If a URL connection to the scheme and URL would return a stream and the path in the URL exists as a directory on the server the presence of the directory on the server could be inferred from the 404 response. The contents and other metadata about the directory are not exposed. This affects http4s versions: 0.21.7 through 0.21.23 0.22.0-M1 through 0.22.0-M8 0.23.0-M1 and 1.0.0-M1 through 1.0.0-M22. The patch is available in the following versions: v0.21.24 v0.22.0-M9 v0.23.0-M2 v1.0.0-M23. As a workaround users can avoid calling StaticFile.fromUrl with non-file URLs.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N

Reference

https://github.com/http4s/http4s/security/advisories/GHSA-6h7w-fc84-x7p6 https://github.com/http4s/http4s/commit/52e1890665410b4385e37b96bc49c5e3c708e4e9 https://mvnrepository.com/artifact/org.http4s/http4s-core Http4s is a Scala interface for HTTP services. StaticFile.fromUrl can leak the presence of a directory on a server when the URL scheme is not file:// and the URL points to a fetchable resource under its scheme and authority. The function returns F[None] indicating no resource if url.getFile is a directory without first checking the scheme or authority of the URL. If a URL connection to the scheme and URL would return a stream and the path in the URL exists as a directory on the server the presence of the directory on the server could be inferred from the 404 response. The contents and other metadata about the directory are not exposed. This affects http4s versions: 0.21.7 through 0.21.23 0.22.0-M1 through 0.22.0-M8 0.23.0-M1 and 1.0.0-M1 through 1.0.0-M22. The patch***](https://github.com/http4s/http4s/commit/52e1890665410b4385e37b96bc49c5e3c708e4e9)) is available in the following versions: v0.21.24 v0.22.0-M9 v0.23.0-M2 v1.0.0-M23. As a workaround users can avoid calling StaticFile.fromUrl with non-file URLs.

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

CHANGED

Integrity Impact

LOW

Availability Impact

NONE

Base Score

NONE

Base Severity

5.8