8.1

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2023-4853

CVE-2023-4853: Quarkus HTTP vulnerable to incorrect evaluation of permissions

A flaw was found in Quarkus where HTTP security policies are not sanitizing certain character permutations correctly when accepting requests, resulting in incorrect evaluation of permissions. This issue could allow an attacker to bypass the security policy altogether, resulting in unauthorized endpoint access and possibly a denial of service.

(GitHub Advisory)

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CVE-2023-4853

CVE-2023-4853:

8.1

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
io.quarkus:quarkus-vertx-http	maven	< 2.16.11.Final	2.16.11.Final
io.quarkus:quarkus-vertx-http	maven	>= 3.0.0, < 3.2.6.Final	3.2.6.Final
io.quarkus:quarkus-vertx-http	maven	>= 3.3.0, < 3.3.3	3.3.3
io.quarkus:quarkus-undertow	maven	< 2.16.11.Final	2.16.11.Final
io.quarkus:quarkus-undertow	maven	>= 3.0.0, < 3.2.6.Final	3.2.6.Final
io.quarkus:quarkus-undertow	maven	>= 3.3.0, < 3.3.3	3.3.3
io.quarkus:quarkus-csrf-reactive	maven	< 2.16.11.Final	2.16.11.Final
io.quarkus:quarkus-csrf-reactive	maven	>= 3.0.0, < 3.2.6.Final	3.2.6.Final
io.quarkus:quarkus-csrf-reactive	maven	>= 3.3.0, < 3.3.3	3.3.3
io.quarkus:quarkus-keycloak-authorization	maven	< 2.16.11.Final	2.16.11.Final
io.quarkus:quarkus-keycloak-authorization	maven	>= 3.0.0, < 3.2.6.Final	3.2.6.Final
io.quarkus:quarkus-keycloak-authorization	maven	>= 3.3.0, < 3.3.3	3.3.3

Technical Details

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Root Cause Analysis

The vulnerability stems from improper path normalization in HTTP security policy checks. Multiple sources (GitHub issue #35785, RHSB-2023-002) confirm that requests with adjacent slashes (e.g., '//q/openapi') bypass security policies. The mitigation involves explicitly checking if the raw path matches the normalized path, indicating the core security logic lacked this normalization. The HttpSecurityPolicy implementations in both Vert.x HTTP and Undertow modules are responsible for path-based authorization checks and would be the logical points where path normalization was missing. The high confidence comes from Red Hat's own mitigation examples showing the need to compare request.path() with normalizedPath(), implying these functions used the raw path for policy evaluation.

Vulnerable functions

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WAF Rule

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Reasoning

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