CVE-2021-27964 : Exploit Details and Defense Strategies

SonLogger before version 6.4.1 is impacted by an Unauthenticated Arbitrary File Upload vulnerability. Attackers can exploit this issue by sending a POST request to /Config/SaveUploadedHotspotLogoFile without any authentication, enabling them to upload malicious files without restriction.

Understanding CVE-2021-27964

This section delves into the details of the SonLogger vulnerability and its potential impact.

What is CVE-2021-27964?

CVE-2021-27964 refers to an Unauthenticated Arbitrary File Upload vulnerability in SonLogger versions before 6.4.1. The flaw allows unauthenticated attackers to upload files to the system without any verification, leading to potential exploitation.

The Impact of CVE-2021-27964

Exploitation of this vulnerability can result in unauthorized upload of malicious files to the affected system, potentially leading to further compromise and unauthorized access.

Technical Details of CVE-2021-27964

This section covers the technical aspects of the CVE-2021-27964 vulnerability.

Vulnerability Description

The vulnerability in SonLogger before 6.4.1 allows attackers to upload files without authentication, bypassing any validation checks for file type or content. This can be exploited for malicious purposes.

Affected Systems and Versions

SonLogger versions prior to 6.4.1 are affected by this vulnerability, exposing them to the risk of unauthenticated file uploads.

Exploitation Mechanism

By sending a crafted POST request to /Config/SaveUploadedHotspotLogoFile, threat actors can upload files without authentication, potentially compromising the system.

Mitigation and Prevention

In this section, we explore the steps to mitigate and prevent exploitation of CVE-2021-27964.

Immediate Steps to Take

Users are advised to update SonLogger to version 6.4.1 or later to mitigate the vulnerability. Additionally, limiting access to the vulnerable endpoint can reduce the risk of exploitation.

Long-Term Security Practices

Implementing strong authentication mechanisms, regularly monitoring for unauthorized file uploads, and conducting security audits can enhance the overall security posture of the system.

Patching and Updates

Vendor-supplied patches or updates should be promptly applied to ensure that the system is protected against known vulnerabilities.