The remote SUSE Linux SLES15 host has a package installed that is affected by multiple vulnerabilities as referenced in the SUSE-SU-2021:3020-1 advisory.

    - CVE-2021-32785: format string bug via hiredis (bsc#1188638)
    - CVE-2021-32786: open redirect in logout functionality (bsc#1188639)
    - CVE-2021-32791: Hardcoded static IV and AAD with a reused key in AES GCM encryption (bsc#1188849)
    - CVE-2021-32792: XSS when using OIDCPreservePost On (bsc#1188848)

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Debian 10 host has a package installed that is affected by multiple vulnerabilities as referenced in the dla-3409 advisory.

    - -------------------------------------------------------------------------     Debian LTS Advisory DLA-3409-1                debian-lts@lists.debian.org     https://www.debian.org/lts/security/                          Adrian Bunk     April 30, 2023                                https://wiki.debian.org/LTS
    - -------------------------------------------------------------------------

    Package        : libapache2-mod-auth-openidc     Version        : 2.3.10.2-1+deb10u2     CVE ID         : CVE-2019-20479 CVE-2021-32785 CVE-2021-32786 CVE-2021-32791                      CVE-2021-32792 CVE-2023-28625     Debian Bug     : 991580 991581 991582 991583 1033916

    Several vulnerabilities were fixed in libapache2-mod-auth-openidc,     an OpenID Connect Relying Party implementation for Apache.

    CVE-2019-20479

        Insufficient validatation of URLs beginning with a slash and backslash.

    CVE-2021-32785

        Crash when using an unencrypted Redis cache.

    CVE-2021-32786

        Open Redirect vulnerability in the logout functionality.

    CVE-2021-32791

        AES GCM encryption in used static IV and AAD.

    CVE-2021-32792

        XSS vulnerability when using OIDCPreservePost.

    CVE-2023-28625

        NULL pointer dereference with OIDCStripCookies.

    For Debian 10 buster, these problems have been fixed in version     2.3.10.2-1+deb10u2.

    We recommend that you upgrade your libapache2-mod-auth-openidc packages.

    For the detailed security status of libapache2-mod-auth-openidc please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/libapache2-mod-auth-openidc

    Further information about Debian LTS security advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://wiki.debian.org/LTS

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Rocky Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2022:1823 advisory.

  - 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.
    (CVE-2021-32786)

  - 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     mod_auth_openidc before version 2.4.9, the AES GCM encryption in mod_auth_openidc uses a static IV and     AAD. It is important to fix because this creates a static nonce and since aes-gcm is a stream cipher, this     can lead to known cryptographic issues, since the same key is being reused. From 2.4.9 onwards this has     been patched to use dynamic values through usage of cjose AES encryption routines. (CVE-2021-32791)

  - 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     mod_auth_openidc before version 2.4.9, there is an XSS vulnerability in when using `OIDCPreservePost On`.
    (CVE-2021-32792)

  - 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.
    (CVE-2021-39191)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of Tencent Linux installed on the remote TencentOS Server 3 host is prior to tested version. It is, therefore, affected by multiple vulnerabilities as referenced in the TSSA-2022:0135 advisory.

    Package updates are available for TencentOS Server 3 that fix the following vulnerabilities:

    CVE-2021-32786:
    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.

    CVE-2021-32791:
    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     mod_auth_openidc before version 2.4.9, the AES GCM encryption in mod_auth_openidc uses a static IV and     AAD. It is important to fix because this creates a static nonce and since aes-gcm is a stream cipher, this     can lead to known cryptographic issues, since the same key is being reused. From 2.4.9 onwards this has     been patched to use dynamic values through usage of cjose AES encryption routines.

    CVE-2021-32792:
    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     mod_auth_openidc before version 2.4.9, there is an XSS vulnerability in when using `OIDCPreservePost On`.

    CVE-2021-39191:
    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.

Tenable has extracted the preceding description block directly from the Tencent Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Oracle Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2022-1823 advisory.

    - Resolves: rhbz#1987222 - CVE-2021-32792 XSS when using OIDCPreservePost On
    - Resolves: rhbz#1987216 - CVE-2021-32791 hardcoded static IV and AAD with a                                reused key in AES GCM encryption [rhel-8] (edit)

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote CentOS Linux 9 host has a package installed that is affected by multiple vulnerabilities as referenced in the mod_auth_openidc-2.4.9.1-1.el9 build changelog.

  - open redirect in oidc_validate_redirect_url() [rhel-9.0] (CVE-2021-32786)

  - hardcoded static IV and AAD with a reused key in AES GCM encryption [rhel-9.0] (CVE-2021-32791)

  - XSS when using OIDCPreservePost On [rhel-9.0] (CVE-2021-32792)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SUSE15 host has a package installed that is affected by multiple vulnerabilities as referenced in the openSUSE-SU-2021:1277-1 advisory.

  - 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. When     mod_auth_openidc versions prior to 2.4.9 are configured to use an unencrypted Redis cache     (`OIDCCacheEncrypt off`, `OIDCSessionType server-cache`, `OIDCCacheType redis`), `mod_auth_openidc`     wrongly performed argument interpolation before passing Redis requests to `hiredis`, which would perform     it again and lead to an uncontrolled format string bug. Initial assessment shows that this bug does not     appear to allow gaining arbitrary code execution, but can reliably provoke a denial of service by     repeatedly crashing the Apache workers. This bug has been corrected in version 2.4.9 by performing     argument interpolation only once, using the `hiredis` API. As a workaround, this vulnerability can be     mitigated by setting `OIDCCacheEncrypt` to `on`, as cache keys are cryptographically hashed before use     when this option is enabled. (CVE-2021-32785)

  - 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.
    (CVE-2021-32786)

  - 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     mod_auth_openidc before version 2.4.9, the AES GCM encryption in mod_auth_openidc uses a static IV and     AAD. It is important to fix because this creates a static nonce and since aes-gcm is a stream cipher, this     can lead to known cryptographic issues, since the same key is being reused. From 2.4.9 onwards this has     been patched to use dynamic values through usage of cjose AES encryption routines. (CVE-2021-32791)

  - 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     mod_auth_openidc before version 2.4.9, there is an XSS vulnerability in when using `OIDCPreservePost On`.
    (CVE-2021-32792)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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.
    (CVE-2021-32786)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Published	Updated	Severity
153248	SUSE SLES15 Security Update : apache2-mod_auth_openidc (SUSE-SU-2021:3020-1)	Nessus	SuSE Local Security Checks	9/14/2021	6/26/2026	medium
174970	Debian dla-3409 : libapache2-mod-auth-openidc - security update	Nessus	Debian Local Security Checks	5/1/2023	1/22/2025	medium
184483	Rocky Linux 8 : mod_auth_openidc:2.3 (RLSA-2022:1823)	Nessus	Rocky Linux Local Security Checks	11/6/2023	11/6/2023	medium
238883	TencentOS Server 3: mod_auth_openidc:2.3 (TSSA-2022:0135)	Nessus	Tencent Local Security Checks	6/16/2025	12/5/2025	medium
161280	Oracle Linux 8 : mod_auth_openidc:2.3 (ELSA-2022-1823)	Nessus	Oracle Linux Local Security Checks	5/18/2022	10/22/2024	medium
191294	CentOS 9 : mod_auth_openidc-2.4.9.1-1.el9	Nessus	CentOS Local Security Checks	2/29/2024	4/26/2024	medium
153452	openSUSE 15 Security Update : apache2-mod_auth_openidc (openSUSE-SU-2021:1277-1)	Nessus	SuSE Local Security Checks	9/17/2021	11/30/2023	medium
252426	Linux Distros Unpatched Vulnerability : CVE-2021-32786	Nessus	Misc.	8/20/2025	8/27/2026	medium

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