libapache2-mod-auth-openidc: CVE-2021-32786

Debian Bug report logs - #991582
libapache2-mod-auth-openidc: CVE-2021-32786

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Message #5 received at submit@bugs.debian.org (full text, mbox, reply):

From: Salvatore Bonaccorso <carnil@debian.org>

To: Debian Bug Tracking System <submit@bugs.debian.org>

Subject: libapache2-mod-auth-openidc: CVE-2021-32786

Date: Tue, 27 Jul 2021 22:06:06 +0200

Source: libapache2-mod-auth-openidc
Version: 2.4.4.1-2
Severity: important
Tags: security upstream
X-Debbugs-Cc: carnil@debian.org, Debian Security Team <team@security.debian.org>

Hi,

The following vulnerability was published for libapache2-mod-auth-openidc.

CVE-2021-32786[0]:
| 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.


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2021-32786
    https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-32786
[1] https://github.com/zmartzone/mod_auth_openidc/security/advisories/GHSA-xm4c-5wm5-jqv7

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore

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