CVE-2021-27963 : Security Advisory and Response

SonLogger before 6.4.1 allows user creation with any user permissions profile, enabling an anonymous user to send a POST request without authentication or session header.

Understanding CVE-2021-27963

This CVE identifies a security vulnerability in SonLogger versions before 6.4.1, potentially allowing unauthorized user creation exploits.

What is CVE-2021-27963?

SonLogger before version 6.4.1 is impacted by a flaw that permits user creation with unrestricted permissions, enabling an anonymous user to exploit the '/User/saveUser' endpoint without proper authentication.

The Impact of CVE-2021-27963

This vulnerability could lead to unauthorized access to sensitive information, malicious user account creation, and potential data breaches if exploited by threat actors.

Technical Details of CVE-2021-27963

SonLogger version before 6.4.1 is susceptible to user creation bypassing permission restrictions, allowing unauthenticated users to create accounts without proper authorization.

Vulnerability Description

The vulnerability in SonLogger allows unauthorized users to send a POST request to '/User/saveUser' without the required authentication, leading to potential account creation with elevated permissions.

Affected Systems and Versions

All versions of SonLogger prior to 6.4.1 are affected by this security issue, exposing systems to unauthorized user manipulation.

Exploitation Mechanism

By exploiting the flaw in SonLogger, malicious actors can abuse the user creation functionality to create accounts with escalated privileges without the need for proper authentication.

Mitigation and Prevention

To address CVE-2021-27963, immediate actions must be taken to secure SonLogger installations and prevent unauthorized user account creation.

Immediate Steps to Take

Upgrade SonLogger to version 6.4.1 or newer to patch the vulnerability and prevent unauthorized user creation.
Monitor the '/User/saveUser' endpoint for suspicious activities and unauthorized access attempts.

Long-Term Security Practices

Implement proper authentication mechanisms and access controls to prevent unauthorized user account creation.
Regularly update SonLogger to the latest version to mitigate potential security vulnerabilities.

Patching and Updates

Stay informed about security updates and patches released by SonLogger to address known vulnerabilities and enhance the overall security posture.