CVE-2021-32786mediumCWE-601

CVE-2021-32786: medium-severity vulnerability in zmartzone mod_auth_openidc

Open Redirect in oidc_validate_redirect_url()

Published · Updated

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13Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 4.7epss 2.4%
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N
Affected products
zmartzone · mod_auth_openidc
Related CVEs — zmartzone mod_auth_openidc

In the same product, most dangerous first.

CVE-2021-32785MEDIUMFormat string bug in the Redis cache implementationEPSS 2.7%CVE-2021-39191MEDIUMURL Redirection to Untrusted Site ('Open Redirect') in mod_auth_openidcEPSS 1.7%CVE-2021-32792LOWXSS vulnerability when using OIDCPreservePost On in mod_auth_openidcEPSS 1.5%CVE-2021-32791MEDIUMHardcoded static IV and AAD with a reused key in AES GCM encryption in mod_auth_openidcEPSS 1.5%CVE-2022-23527MEDIUMOpen Redirect in oidc_validate_redirect_url()EPSS 0.9%