A flaw was found in Keycloak. This flaw allows impersonation and lockout due to the email trust not being handled correctly in Keycloak. An attacker can shadow other users with the same email and lockout or impersonate them.

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2023:7483 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 7.6.6 on RHEL 8 serves as a replacement for Red Hat Single Sign-On     7.6.5, and includes bug fixes and enhancements.

    Security Fix(es):
    * undertow: HTTP/2: Multiple HTTP/2 enabled web servers are vulnerable to a DDoS attack (Rapid Reset     Attack) (CVE-2023-44487)
    * netty-codec-http2: HTTP/2: Multiple HTTP/2 enabled web servers are vulnerable to a DDoS attack (Rapid     Reset Attack) (CVE-2023-44487)
    * bouncycastle: potential blind LDAP injection attack using a self-signed certificate (CVE-2023-33201)
    * keycloak: impersonation and lockout possible through incorrect handling of email trust (CVE-2023-0105)

    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-2023:7482 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 7.6.6 on RHEL 7 serves as a replacement for Red Hat Single Sign-On     7.6.5, and includes bug fixes and enhancements.

    Security Fix(es):
    * undertow: HTTP/2: Multiple HTTP/2 enabled web servers are vulnerable to a DDoS attack (Rapid Reset     Attack) (CVE-2023-44487)
    * netty-codec-http2: HTTP/2: Multiple HTTP/2 enabled web servers are vulnerable to a DDoS attack (Rapid     Reset Attack) (CVE-2023-44487)
    * bouncycastle: potential blind LDAP injection attack using a self-signed certificate (CVE-2023-33201)
    * keycloak: impersonation and lockout possible through incorrect handling of email trust (CVE-2023-0105)

    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-2023:7484 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 7.6.6 on RHEL 9 serves as a replacement for Red Hat Single Sign-On     7.6.5, and includes bug fixes and enhancements.

    Security Fix(es):

    * undertow: HTTP/2: Multiple HTTP/2 enabled web servers are vulnerable to a DDoS attack (Rapid Reset     Attack) (CVE-2023-44487)
    * netty-codec-http2: HTTP/2: Multiple HTTP/2 enabled web servers are vulnerable to a DDoS attack (Rapid     Reset Attack) (CVE-2023-44487)
    * bouncycastle: potential blind LDAP injection attack using a self-signed certificate (CVE-2023-33201)
    * keycloak: impersonation and lockout possible through incorrect handling of email trust (CVE-2023-0105)

    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
186248	RHEL 8 : Red Hat Single Sign-On 7.6.6 security update on RHEL 8 (Important) (RHSA-2023:7483)	Nessus	Red Hat Local Security Checks	critical
186247	RHEL 7 : Red Hat Single Sign-On 7.6.6 security update on RHEL 7 (Important) (RHSA-2023:7482)	Nessus	Red Hat Local Security Checks	critical
186246	RHEL 9 : Red Hat Single Sign-On 7.6.6 security update on RHEL 9 (Important) (RHSA-2023:7484)	Nessus	Red Hat Local Security Checks	critical

Detections

Analytics

CVE-2023-0105

medium

Tenable Plugins

critical

critical

critical