Multiple vulnerabilities in Keycloak

1) Open redirect

EUVDB-ID: #VU97622

Risk: Low

CVSSv4.0: 0.5 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2024-8883

CWE-ID: CWE-601 - URL Redirection to Untrusted Site ('Open Redirect')

Exploit availability: No

Description

The vulnerability allows a remote attacker to redirect victims to arbitrary URL.

The vulnerability exists due to a misconfiguration when handling redirects. A remote attacker can create a link that leads to a trusted website, however, when clicked, redirects the victim to arbitrary domain if a 'Valid Redirect URI' is set to http://localhost or http://127.0.0.1

Successful exploitation of this vulnerability may allow a remote attacker to perform a phishing attack and steal potentially sensitive information.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Keycloak: 20.0.0 - 25.0.5

CPE2.3

• cpe:2.3:a:keycloak:keycloak:25.0.5:*:*:*:*:*:*:*

External links

https://bugzilla.redhat.com/show_bug.cgi?id=2312511
https://github.com/keycloak/keycloak/blob/main/services/src/main/java/org/keycloak/protocol/oidc/utils/RedirectUtils.java
https://github.com/advisories/GHSA-vvf8-2h68-9475
https://github.com/keycloak/keycloak/releases/tag/25.0.6
https://github.com/keycloak/keycloak/security/advisories/GHSA-w8gr-xwp4-r9f7

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Improper verification of cryptographic signature

EUVDB-ID: #VU97621

Risk: Medium

CVSSv4.0: 7.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:P/U:Green]

CVE-ID: CVE-2024-8698

CWE-ID: CWE-347 - Improper Verification of Cryptographic Signature

Exploit availability: Yes

Description

The vulnerability allows a remote user to escalate privileges within the application.

The vulnerability exists due to improper validation of SAML signature within the Keycloak XMLSignatureUtil class. The method incorrectly determines whether a SAML signature is for the full document or only for specific assertions based on the position of the signature in the XML document, rather than the Reference element used to specify the signed element. A remote user can create crafted responses that bypass the validation, potentially leading to privilege escalation or impersonation attacks.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Keycloak: 20.0.0 - 25.0.5

CPE2.3

• cpe:2.3:a:keycloak:keycloak:25.0.5:*:*:*:*:*:*:*

External links

https://bugzilla.redhat.com/show_bug.cgi?id=2311641
https://github.com/keycloak/keycloak/blob/main/saml-core/src/main/java/org/keycloak/saml/processing/core/util/XMLSignatureUtil.java#L415
https://github.com/advisories/GHSA-4xx7-2cx3-x473
https://github.com/keycloak/keycloak/releases/tag/25.0.6
https://github.com/keycloak/keycloak/security/advisories/GHSA-xgfv-xpx8-qhcr

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.