Red Hat Keycloak Logout Request Denial of Service Vulnerability [CVE-2017-2646]

A vulnerability in Red Hat Keycloak could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on a targeted system.

The vulnerability exists because the affected software improperly processes logout requests that contain an extension element. An attacker could exploit this vulnerability by sending a logout request that submits malicious input to the targeted system. A successful exploit could cause the SAMLSloRequestParser.parse() method to end in an infinite loop, resulting in a DoS condition.

Red Hat has confirmed the vulnerability and released software updates.

  • To exploit this vulnerability, an attacker must send a logout request that submits malicious input to the targeted system, making exploitation more difficult in environments that restrict network access from untrusted sources.
  • Administrators are advised to apply the appropriate updates.

    Administrators are advised to allow only trusted users to have network access.

    Administrators are advised to run both firewall and antivirus applications to minimize the potential of inbound and outbound threats.

    Administrators may consider using IP-based access control lists (ACLs) to allow only trusted systems to access the affected systems.

    Administrators can help protect affected systems from external attacks by using a solid firewall strategy.

    Administrators are advised to monitor affected systems.

Vendor Announcements
  • Red Hat has released an official CVE statement for bug 1431230 at the following link: CVE-2017-2646
Fixed Software
  • Keycloak, which is part of a community of Red Hat projects, has released software updates at the following link: Keycloak 2.5.5 or later

Duncan Newell

Duncan is a technology professional with over 20 years experience of working in various IT roles. He has a interest in cyber security, and has a wide range of other skills in radio, electronics and telecommunications.

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