Bug 2255024 (CVE-2023-6920) - CVE-2023-6920 keycloak-core: Reflected XSS via wildcard in OIDC redirect_uri. Incomplete fix of CVE-2023-6134
Summary: CVE-2023-6920 keycloak-core: Reflected XSS via wildcard in OIDC redirect_uri....
Keywords:
Status: CLOSED DUPLICATE of bug 2255027
Alias: CVE-2023-6920
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks: 2255023
TreeView+ depends on / blocked
 
Reported: 2023-12-18 15:01 UTC by Patrick Del Bello
Modified: 2023-12-18 21:47 UTC (History)
11 users (show)

Fixed In Version:
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An incomplete fix was found in the Keycloak Core patch. An attacker can steal authorization codes or tokens from clients using a wildcard in the JARM response mode "form_post.jwt". Changing the response_mode parameter in the original proof of concept from "form_post" to "form_post.jwt" can bypass the security patch implemented to address CVE-2023-6134.
Clone Of:
Environment:
Last Closed: 2023-12-18 16:22:46 UTC
Embargoed:

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Description Patrick Del Bello 2023-12-18 15:01:34 UTC 
An incomplete fix was found in Keycloak Core patch. An attacker can steal authorization codes or tokens from clients using a wildcard in the JARM response mode "form_post.jwt". It is observed that changing the response_mode parameter in the original proof of concept from "form_post" to "form_post.jwt" can bypass the security patch implemented to address CVE-2023-6134.
Comment 2 Mauro Matteo Cascella 2023-12-18 16:22:46 UTC 

*** This bug has been marked as a duplicate of bug 2255027 ***
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