CVE-2021-32786

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.

Risk Information

Base Score

6.1

MODERATE

Vector

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

EPSS Score

Exploitation Probability

0.098

Associated Vulnerability

Vulnerability	OS Platform
SUSE-SU-2021:3352-1(SUSE Linux Enterprise Server 12-SP5 ) apache2-mod_auth_openidc-2.4.0-3.23.1.x86_64.rpm	Linux
SUSE-SU-2021:3352-1(SUSE Linux Enterprise Server 12-SP5 ) apache2-mod_auth_openidc-debuginfo-2.4.0-3.23.1.x86_64.rpm	Linux
SUSE-SU-2021:3352-1(SUSE Linux Enterprise Server 12-SP5 ) apache2-mod_auth_openidc-debugsource-2.4.0-3.23.1.x86_64.rpm	Linux
(RHSA-2022:1823) mod_auth_openidc:2.3 security update mod_auth_openidc-2.3.7-11.module+el8.6.0+14082+b6f23e95.x86_64.rpm	Linux
(RHSA-2022:1823) mod_auth_openidc:2.3 security update mod_auth_openidc-debugsource-2.3.7-11.module+el8.6.0+14082+b6f23e95.x86_64.rpm	Linux
mod_auth_openidc:2.3 security update (RLSA-2022:1823) cjose-0.6.1-2.module+el8.3.0+129+2feafa46.x86_64.rpm	Linux
mod_auth_openidc:2.3 security update (RLSA-2022:1823) cjose-devel-0.6.1-2.module+el8.3.0+129+2feafa46.x86_64.rpm	Linux
mod_auth_openidc:2.3 security update (RLSA-2022:1823) mod_auth_openidc-2.3.7-11.module+el8.6.0+840+73eca44e.x86_64.rpm	Linux

Patch Details

No records found

References

https://nvd.nist.gov/vuln/detail/CVE-2023-1234
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-1234