A flaw was found in Keycloak. This flaw depends on a non-default configuration "Revalidate Client Certificate" to be enabled and the reverse proxy is not validating the certificate before Keycloak. Using this method an attacker may choose the certificate which will be validated by the server. If this happens and the KC_SPI_TRUSTSTORE_FILE_FILE variable is missing/misconfigured, any trustfile may be accepted with the logging information of "Cannot validate client certificate trust: Truststore not available". This may not impact availability as the attacker would have no access to the server, but consumer applications Integrity or Confidentiality may be impacted considering a possible access to them. Considering the environment is correctly set to use "Revalidate Client Certificate" this flaw is avoidable.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - A flaw was found in Keycloak. This flaw depends on a non-default configuration "Revalidate Client
    Certificate" to be enabled and the reverse proxy is not validating the certificate before Keycloak. Using
    this method an attacker may choose the certificate which will be validated by the server. If this happens
    and the KC_SPI_TRUSTSTORE_FILE_FILE variable is missing/misconfigured, any trustfile may be accepted with
    the logging information of "Cannot validate client certificate trust: Truststore not available". This may
    not impact availability as the attacker would have no access to the server, but consumer applications
    Integrity or Confidentiality may be impacted considering a possible access to them. Considering the
    environment is correctly set to use "Revalidate Client Certificate" this flaw is avoidable.
    (CVE-2023-1664)

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2023:3884 advisory.

    Red Hat Single Sign-On 7.6 is a standalone server, based on the Keycloak project, that provides     authentication and standards-based single sign-on capabilities for web and mobile applications.

    This release of Red Hat Single Sign-On 7.6.4 on RHEL 8 serves as a replacement for Red Hat Single Sign-On     7.6.3, and includes bug fixes and enhancements, which are documented in the Release Notes document linked     to in the References.

    Security Fix(es):

    * keycloak: Cross-site scripting when validating URI-schemes on SAML and OIDC (CVE-2022-4361)

    * undertow: Infinite loop in SslConduit during close (CVE-2023-1108)

    * keycloak: oauth client impersonation (CVE-2023-2422)

    * keycloak: Untrusted Certificate Validation (CVE-2023-1664)

    * keycloak: client access via device auth request spoof (CVE-2023-2585)

    For more details about the security issue(s), including the impact, a CVSS score, and other related     information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise 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 Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2023:3883 advisory.

    Red Hat Single Sign-On 7.6 is a standalone server, based on the Keycloak project, that provides     authentication and standards-based single sign-on capabilities for web and mobile applications.

    This release of Red Hat Single Sign-On 7.6.4 on RHEL 7 serves as a replacement for Red Hat Single Sign-On     7.6.3, and includes bug fixes and enhancements, which are documented in the Release Notes document linked     to in the References.

    Security Fix(es):

    * keycloak: Cross-site scripting when validating URI-schemes on SAML and OIDC (CVE-2022-4361)

    * undertow: Infinite loop in SslConduit during close (CVE-2023-1108)

    * keycloak: oauth client impersonation (CVE-2023-2422)

    * keycloak: Untrusted Certificate Validation (CVE-2023-1664)

    * keycloak: client access via device auth request spoof (CVE-2023-2585)

    For more details about the security issue(s), including the impact, a CVSS score, and other related     information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise 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 Redhat Enterprise Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2023:3885 advisory.

    Red Hat Single Sign-On 7.6 is a standalone server, based on the Keycloak project, that provides     authentication and standards-based single sign-on capabilities for web and mobile applications.

    This release of Red Hat Single Sign-On 7.6.4 on RHEL 9 serves as a replacement for Red Hat Single Sign-On     7.6.3, and includes bug fixes and enhancements, which are documented in the Release Notes document linked     to in the References.

    Security Fix(es):

    * keycloak: Cross-site scripting when validating URI-schemes on SAML and OIDC (CVE-2022-4361)

    * undertow: Infinite loop in SslConduit during close (CVE-2023-1108)

    * keycloak: oauth client impersonation (CVE-2023-2422)

    * keycloak: Untrusted Certificate Validation (CVE-2023-1664)

    * keycloak: client access via device auth request spoof (CVE-2023-2585)

    For more details about the security issue(s), including the impact, a CVSS score, and other related     information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise 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.

ID	Name	Product	Family	Severity
410758	SCA: security update for org.keycloak:keycloak-core (GHSA-5cc8-pgp5-7mpm)	Tenable Cloud Security	SCA Checks	medium
410758	SCA: security update for org.keycloak:keycloak-core (GHSA-5cc8-pgp5-7mpm)	Tenable Self-Hosted Container Security	SCA Checks	medium
177672	RHEL 8 : Red Hat Single Sign-On 7.6.4 security update on RHEL 8 (Important) (RHSA-2023:3884)	Nessus	Red Hat Local Security Checks	high
177671	RHEL 7 : Red Hat Single Sign-On 7.6.4 security update on RHEL 7 (Important) (RHSA-2023:3883)	Nessus	Red Hat Local Security Checks	high
177670	RHEL 9 : Red Hat Single Sign-On 7.6.4 security update on RHEL 9 (Important) (RHSA-2023:3885)	Nessus	Red Hat Local Security Checks	high

Detections

Analytics

CVE-2023-1664

medium

Tenable Plugins

medium

medium

high

high

high