CVE-2019-13483 : Security Advisory and Response

Auth0 Passport-SharePoint prior to version 0.4.0 fails to validate the digital signature of JWT Access Tokens, enabling attackers to manipulate tokens and bypass authentication and authorization mechanisms.

Understanding CVE-2019-13483

This CVE involves a vulnerability in Auth0 Passport-SharePoint that allows for the forging of tokens, potentially leading to unauthorized access.

What is CVE-2019-13483?

The version of Auth0 Passport-SharePoint before 0.4.0 does not verify the digital signature of a JWT Access Token, enabling malicious actors to tamper with tokens and evade security controls.

The Impact of CVE-2019-13483

This vulnerability permits threat actors to exploit tokens, compromising the integrity of authentication and authorization processes within affected systems.

Technical Details of CVE-2019-13483

Auth0 Passport-SharePoint fails to validate the JWT signature of Access Tokens, creating a security gap that can be leveraged by attackers.

Vulnerability Description

The issue lies in the lack of verification of JWT Access Token signatures, allowing unauthorized token manipulation.

Affected Systems and Versions

Product: Auth0 Passport-SharePoint
Versions affected: Prior to 0.4.0

Exploitation Mechanism

Malicious individuals can exploit this vulnerability to manipulate tokens, bypassing authentication and authorization controls.

Mitigation and Prevention

Implementing immediate steps and long-term security practices can help mitigate the risks associated with CVE-2019-13483.

Immediate Steps to Take

Upgrade Auth0 Passport-SharePoint to version 0.4.0 or later.
Monitor and analyze token usage for any suspicious activity.

Long-Term Security Practices

Regularly review and update authentication and authorization mechanisms.
Conduct security assessments to identify and address vulnerabilities proactively.

Patching and Updates

Apply patches and updates provided by Auth0 to address the vulnerability and enhance system security.