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CVE-2021-39191— URL Redirection to Untrusted Site ('Open Redirect') in mod_auth_openidc

Quick assessment

Affected
zmartzone mod_auth_openidc
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.

mod_auth_openidc是一个应用软件。是 Apache 2.x HTTP 服务器的身份验证/授权模块，用作OpenID Connect 依赖方，根据 OpenID Connect 提供程序对用户进行身份验证。 mod_auth_openidc是Apache2.x HTTP服务器的身份验证/授权模块，作为OpenID连接依赖方，根据OpenID连接提供程序对用户进行身份验证。mod_auth_openidc 2.4.9.4之前的版本存在输入验证错误漏洞,该漏洞源于第三方初始化SSO功能容易受到开放

CVSS 4.7 · Medium EPSS 1.74% · P77

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise
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I. Basic Information for CVE-2021-39191

Vulnerability Information
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Vulnerability Title
URL Redirection to Untrusted Site ('Open Redirect') in mod_auth_openidc
Source: CVE Program / CVE List V5
Vulnerability Description
mod_auth_openidc is an authentication/authorization module for the Apache 2.x HTTP server that functions as an OpenID Connect Relying Party, authenticating users against an OpenID Connect Provider. In versions prior to 2.4.9.4, the 3rd-party init SSO functionality of mod_auth_openidc was reported to be vulnerable to an open redirect attack by supplying a crafted URL in the `target_link_uri` parameter. A patch in version 2.4.9.4 made it so that the `OIDCRedirectURLsAllowed` setting must be applied to the `target_link_uri` parameter. There are no known workarounds aside from upgrading to a patched version.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
指向未可信站点的URL重定向(开放重定向)
Source: CVE Program / CVE List V5
Vulnerability Title
mod_auth_openidc 输入输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
mod_auth_openidc是一个应用软件。是 Apache 2.x HTTP 服务器的身份验证/授权模块，用作OpenID Connect 依赖方，根据 OpenID Connect 提供程序对用户进行身份验证。 mod_auth_openidc是Apache2.x HTTP服务器的身份验证/授权模块，作为OpenID连接依赖方，根据OpenID连接提供程序对用户进行身份验证。mod_auth_openidc 2.4.9.4之前的版本存在输入验证错误漏洞,该漏洞源于第三方初始化SSO功能容易受到开放
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
zmartzone mod_auth_openidc <=2.4.9.3 -

II. Public POCs for CVE-2021-39191

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III. Intelligence Information for CVE-2021-39191

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Patches & Fixes for CVE-2021-39191 (1)

Vendor Advisories for CVE-2021-39191 (1)

Mailing List Discussions for CVE-2021-39191 (3)

Other References for CVE-2021-39191 (2)

IV. Related Vulnerabilities

Same product: mod_auth_openidc
Same vendor: zmartzone
Same weakness: CWE-601

V. Comments for CVE-2021-39191

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