CVE-2017-2646 Explained : Impact and Mitigation

A vulnerability was discovered in Keycloak versions prior to 2.5.5 where a Logout request with an Extension in the middle of the request could cause the SAMLSloRequestParser.parse() method to enter an infinite loop, potentially enabling denial of service attacks.

Understanding CVE-2017-2646

This CVE affects Red Hat's Keycloak version 2.5.5 and was published on July 27, 2018.

What is CVE-2017-2646?

The vulnerability in Keycloak versions before 2.5.5 allows an attacker to trigger an infinite loop in the SAMLSloRequestParser.parse() method by sending a Logout request with an Extension, leading to potential denial of service attacks.

The Impact of CVE-2017-2646

CVSS Score: 7.5 (High)
Attack Vector: Network
Availability Impact: High
Attack Complexity: Low
Exploiting this vulnerability could result in denial of service attacks.

Technical Details of CVE-2017-2646

This section provides more in-depth technical information about the CVE.

Vulnerability Description

The flaw in Keycloak versions before 2.5.5 allows an attacker to exploit the SAMLSloRequestParser.parse() method, causing it to enter an infinite loop.

Affected Systems and Versions

Affected Product: Keycloak
Vendor: Red Hat
Affected Version: 2.5.5

Exploitation Mechanism

By sending a Logout request with an Extension in the middle, an attacker can trigger the infinite loop in the SAMLSloRequestParser.parse() method.

Mitigation and Prevention

Protecting systems from CVE-2017-2646 is crucial to prevent potential denial of service attacks.

Immediate Steps to Take

Update Keycloak to version 2.5.5 or later to mitigate the vulnerability.
Monitor network traffic for any suspicious Logout requests.

Long-Term Security Practices

Regularly update software and apply security patches to prevent known vulnerabilities.

Patching and Updates

Stay informed about security advisories from Red Hat and apply patches promptly.