Описание
A flaw was found in Keycloak. A remote, unauthenticated attacker can send a specially crafted XML input to the Security Assertion Markup Language (SAML) endpoint. This malicious input can cause high CPU usage and worker thread starvation, leading to a Denial of Service (DoS) where the server becomes unavailable.
Отчет
This is a High severity denial of service vulnerability in Keycloak. An unauthenticated attacker with network access can send specially crafted XML input to the SAML endpoint, causing high CPU utilization and worker thread exhaustion, which renders the Keycloak server unavailable. This directly impacts the availability of Keycloak instances where the SAML protocol is enabled.
Меры по смягчению последствий
To mitigate this vulnerability, restrict network access to the Keycloak SAML endpoint to trusted networks and clients. Implement firewall rules to limit inbound connections to the Keycloak service port (e.g., 8080) from untrusted sources. If the SAML protocol is not required for your deployment, consider disabling it to eliminate the attack surface. Applying these network restrictions or configuration changes may necessitate a restart or reload of the Keycloak service, which could temporarily affect its availability.
Дополнительная информация
Статус:
EPSS
7.5 High
CVSS3
Связанные уязвимости
A flaw was found in Keycloak. A remote, unauthenticated attacker can send a specially crafted XML input to the Security Assertion Markup Language (SAML) endpoint. This malicious input can cause high CPU usage and worker thread starvation, leading to a Denial of Service (DoS) where the server becomes unavailable.
A flaw was found in Keycloak. A remote, unauthenticated attacker can s ...
Keycloak: Denial of Service via specially crafted SAML input
Уязвимость компонента SAML Endpoint программного средства для управления идентификацией и доступом Keycloak, позволяющая нарушителю вызвать отказ в обслуживании
EPSS
7.5 High
CVSS3