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CVE-2021-32786— Open Redirect in oidc_validate_redirect_url()

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之前版本存在输入验证错误漏洞，攻击者可以绕过此功能并导致注销功能中的Open Redirect漏洞。

CVSS 4.7 · Medium EPSS 2.36% · P83
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I. Basic Information for CVE-2021-32786

Vulnerability Information
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Vulnerability Title
Open Redirect in oidc_validate_redirect_url()
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, `oidc_validate_redirect_url()` does not parse URLs the same way as most browsers do. As a result, this function can be bypassed and leads to an Open Redirect vulnerability in the logout functionality. This bug has been fixed in version 2.4.9 by replacing any backslash of the URL to redirect with slashes to address a particular breaking change between the different specifications (RFC2396 / RFC3986 and WHATWG). As a workaround, this vulnerability can be mitigated by configuring `mod_auth_openidc` to only allow redirection whose destination matches a given regular expression.
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之前版本存在输入验证错误漏洞，攻击者可以绕过此功能并导致注销功能中的Open Redirect漏洞。
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 -

II. Public POCs for CVE-2021-32786

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III. Intelligence Information for CVE-2021-32786

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Patches & Fixes for CVE-2021-32786 (1)

Vendor Advisories for CVE-2021-32786 (2)

Mailing List Discussions for CVE-2021-32786 (3)

Security Blog Posts for CVE-2021-32786 (1)

Other References for CVE-2021-32786 (1)

IV. Related Vulnerabilities

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

V. Comments for CVE-2021-32786

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