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Reflected XSS Vulnerability in Authentication Flow URL Handling

High
duckboy81 published GHSA-w5rq-g9r6-vrcg Nov 25, 2024

Package

npm @dapperduckling/keycloak-connector-server (npm)

Affected versions

<2.5.4

Patched versions

2.5.5

Description

Impact
A Reflected Cross-Site Scripting (XSS) vulnerability was discovered in the authentication flow of the application. This issue arises due to improper sanitization of the URL parameters, allowing the URL bar's contents to be injected and reflected into the HTML page. An attacker could craft a malicious URL to execute arbitrary JavaScript in the browser of a victim who visits the link.

Who is impacted?
Any application utilizing this authentication library is vulnerable. Users of the application are at risk if they can be lured into clicking on a crafted malicious link.

Patches
The vulnerability has been patched in 2.5.5 by ensuring proper sanitization and escaping of user input in the affected URL parameters.

Users are strongly encouraged to upgrade to the following versions:

Workarounds
If upgrading is not immediately possible, users can implement the following workarounds:

  • Employ a Web Application Firewall (WAF) to block malicious requests containing suspicious URL parameters.
  • Apply input validation and escaping directly within the application’s middleware or reverse proxy layer, specifically targeting the affected parameters.

References

Severity

High

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

CVE ID

CVE-2024-53843

Weaknesses

No CWEs