CVE-2019-10201 Improper Verification of Cryptographic Signature in keycloak

What is CVE-2019-10201?

CVE-2019-10201 is a high-severity authentication bypass vulnerability in Redhat Keycloak, published on 14 Aug 2019. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

It was found that Keycloak's SAML broker, versions up to 6.0.1, did not verify missing message signatures. If an attacker modifies the SAML Response and removes the <Signature> sections, the message is still accepted, and the message can be modified. An attacker could use this flaw to impersonate other users and gain access to sensitive information.

Weakness: CWE-347, CWE-592

Which versions are affected by CVE-2019-10201?

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

Products include Redhat Keycloak, Redhat Single Sign-On.

How do I fix CVE-2019-10201?

Upgrade org.keycloak:keycloak-core to 7.0.0 or later.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2019-10201 being exploited?

There is no known exploitation of CVE-2019-10201 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-4fgq-gq9g-3rw7.