CVE-2017-2646 Keycloak vulnerable to infinite loop based Denial of Service

What is CVE-2017-2646?

CVE-2017-2646 is a high-severity denial of service vulnerability in Redhat Keycloak, published on 27 Jul 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

It was found that when Keycloak before 2.5.5 receives a Logout request with a Extensions in the middle of the request, the SAMLSloRequestParser.parse() method ends in a infinite loop. An attacker could use this flaw to conduct denial of service attacks.

Weakness: CWE-835

Which versions are affected by CVE-2017-2646?

2 open source packages ship an affected version, including org.keycloak:keycloak-core. It affects 1 product.

Products include Redhat Keycloak.

How do I fix CVE-2017-2646?

Upgrade org.keycloak:keycloak-core to 2.5.5 or later.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2017-2646 being exploited?

There is no known exploitation of CVE-2017-2646 in the wild and no public exploit code.

Other vulnerabilities in Redhat Keycloak

• CVE-2022-4361 Keycloak vulnerable to cross-site scripting when validating URI-schemes on SAML and OIDC Critical 10.0
• CVE-2022-1245 Keycloak vulnerable to privilege escalation on Token Exchange feature Critical 9.8
• CVE-2021-20195 keycloak Self Stored Cross-site Scripting vulnerability Critical 9.6
• CVE-2019-14910 Keycloak Authentication Error Critical 9.3
• CVE-2019-14909 Keycloak Authentication Error Critical 9.3

All Redhat Keycloak vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-jc6q-27mw-p55w.