Keycloak JARM form_post.jwt Wildcard Exploit Leaks Auth Tokens
CVE-2023-6927 Published on December 18, 2023

Keycloak: open redirect via "form_post.jwt" jarm response mode
A flaw was found in Keycloak. This issue may allow an attacker to steal authorization codes or tokens from clients using a wildcard in the JARM response mode "form_post.jwt" which could be used to bypass the security patch implemented to address CVE-2023-6134.

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Vulnerability Analysis

CVE-2023-6927 can be exploited with network access, requires user interaction and a small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a small impact on confidentiality and integrity, and no impact on availability.

Attack Vector:
NETWORK
Attack Complexity:
LOW
Privileges Required:
LOW
User Interaction:
REQUIRED
Scope:
UNCHANGED
Confidentiality Impact:
LOW
Integrity Impact:
LOW
Availability Impact:
NONE

Timeline

Reported to Red Hat.

Made public.

Weakness Type

What is an Open Redirect Vulnerability?

A web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a Redirect. This simplifies phishing attacks. An http parameter may contain a URL value and could cause the web application to redirect the request to the specified URL. By modifying the URL value to a malicious site, an attacker may successfully launch a phishing scam and steal user credentials. Because the server name in the modified link is identical to the original site, phishing attempts have a more trustworthy appearance.

CVE-2023-6927 has been classified to as an Open Redirect vulnerability or weakness.


Products Associated with CVE-2023-6927

You can be notified by email with stack.watch whenever vulnerabilities like CVE-2023-6927 are published in these products:

Red Hat Keycloak
 
Red Hat Single Sign On
 
Red Hat Build Keycloak
 
Red Hat Single Sign On
 
Red Hat Rhosemc
 

Affected Versions

Red Hat build of Keycloak 22: Red Hat build of Keycloak 22.0.8: Red Hat Single Sign-On 7: Red Hat Single Sign-On 7.6 for RHEL 7: Red Hat Single Sign-On 7.6 for RHEL 7: Red Hat Single Sign-On 7.6 for RHEL 8: Red Hat Single Sign-On 7.6 for RHEL 8: Red Hat Single Sign-On 7.6 for RHEL 9: Red Hat Single Sign-On 7.6 for RHEL 9: Red Hat RHEL-8 based Middleware Containers: Red Hat RHEL-8 based Middleware Containers: Red Hat Single Sign-On 7.6.6:

Exploit Probability

EPSS
0.84%
Percentile
74.34%

EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.