CVE-2023-41049 – This CVE describes a cross-site scripting (XSS)... (How to Fix)

Q: What is the severity of CVE-2023-41049?

CVE-2023-41049 has a CVSS score of 7.5 (HIGH). This CVE describes a cross-site scripting (XSS) vulnerability in the @dcl/single-sign-on-client npm library. Improper input validation in the init function allows attackers to execute arbitrary JavaScript using the javascript: prefix. This affects applications using vulnerable versions of this authentication library.

📋 TL;DR

This CVE describes a cross-site scripting (XSS) vulnerability in the @dcl/single-sign-on-client npm library. Improper input validation in the init function allows attackers to execute arbitrary JavaScript using the javascript: prefix. This affects applications using vulnerable versions of this authentication library.

💻 Affected Systems

Products:

@dcl/single-sign-on-client

Versions: All versions before 0.1.0

Operating Systems: All

Default Config Vulnerable: ⚠️ Yes

Notes: Any application using the vulnerable init function with untrusted input is affected.

📦 What is this software?

Single Sign On Client by Decentraland

View all CVEs affecting Single Sign On Client →

⚠️ Risk & Real-World Impact

🔴

Worst Case

Complete compromise of user sessions, credential theft, and unauthorized access to protected resources through client-side JavaScript execution.

🟠

Likely Case

Session hijacking, credential theft, and unauthorized actions performed on behalf of authenticated users.

🟢

If Mitigated

Limited impact with proper input validation and output encoding in place, potentially preventing successful exploitation.

🌐 Internet-Facing: HIGH

🏢 Internal Only: MEDIUM

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: LIKELY

Unauthenticated Exploit: ⚠️ Yes

Complexity: LOW

XSS vulnerabilities are commonly exploited and require minimal technical skill when weaponized.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: 0.1.0

Vendor Advisory: https://github.com/decentraland/single-sign-on-client/security/advisories/GHSA-vp4f-wxgw-7x8x

Restart Required: Yes

Instructions:

1. Update package.json to specify @dcl/single-sign-on-client version 0.1.0 or higher. 2. Run npm update @dcl/single-sign-on-client. 3. Restart your application to load the patched version.

🔧 Temporary Workarounds

Input Validation Workaround

all

Implement strict input validation to reject any input containing javascript: prefixes before passing to the init function.

🧯 If You Can't Patch

Implement strict input validation and sanitization for all user inputs passed to the init function.
Implement Content Security Policy (CSP) headers to restrict script execution sources.

🔍 How to Verify

Check if Vulnerable:

Check package.json or run npm list @dcl/single-sign-on-client to see if version is below 0.1.0.

Check Version:

npm list @dcl/single-sign-on-client

Verify Fix Applied:

Confirm package.json specifies version 0.1.0 or higher and npm list shows the updated version.

📡 Detection & Monitoring

Log Indicators:

Unusual authentication attempts
JavaScript errors related to the init function
Unexpected redirects to javascript: URLs

Network Indicators:

Requests containing javascript: in parameters
Unexpected redirects in authentication flows

SIEM Query:

search 'javascript:' in web request parameters OR search for authentication failures from @dcl/single-sign-on-client

📊 Metadata

CVE ID: CVE-2023-41049

CVSS v3 Score: 7.5 (HIGH)

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CWE: CWE-79

Published: September 1, 2023

Last Updated: November 21, 2024

🔗 References

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🔗 Related Vulnerabilities

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