Red Hat Keycloak/Single Sign-On HTTP Response KC_RESTART information disclosure

Summaryinfo

A vulnerability classified as problematic was found in Red Hat Keycloak and Single Sign-On. Affected by this issue is some unknown functionality of the component HTTP Response Handler. Executing a manipulation of the argument KC_RESTART can lead to information disclosure. This vulnerability appears as CVE-2024-4540. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability was found in Red Hat Keycloak and Single Sign-On (version unknown). It has been declared as problematic. This vulnerability affects an unknown function of the component HTTP Response Handler. The manipulation of the argument KC_RESTART with an unknown input leads to a information disclosure vulnerability. The CWE definition for the vulnerability is CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. As an impact it is known to affect confidentiality. CVE summarizes:

A flaw was found in Keycloak in OAuth 2.0 Pushed Authorization Requests (PAR). Client-provided parameters were found to be included in plain text in the KC_RESTART cookie returned by the authorization server's HTTP response to a `request_uri` authorization request, possibly leading to an information disclosure vulnerability.

The advisory is available at access.redhat.com. This vulnerability was named CVE-2024-4540 since 05/06/2024. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $5k-$25k at the moment (estimation calculated on 09/07/2025). This vulnerability is assigned to T1592 by the MITRE ATT&CK project.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2024-1945). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Vendor

• Red Hat

Name

• Keycloak
• Single Sign-On

License

• open-source

Website

• Vendor: https://www.redhat.com/

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CPE 2.2info

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Entryinfo

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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