CVE-2021-27770 : What You Need to Know

HCL Sametime is vulnerable to arbitrary HTTP requests due to a flaw discovered within the "FaviconService". This vulnerability has a base score of 6.8 and impacts confidentiality.

Understanding CVE-2021-27770

This section will cover what CVE-2021-27770 is, its impact, technical details, and mitigation steps.

What is CVE-2021-27770?

The vulnerability was found in the "FaviconService" component, allowing arbitrary HTTP requests. The service accepts a base64-encoded URL, which is later requested by the webserver. It is presumed that this service is utilized by the "meetings" feature, where users can specify an external URL for online meetings.

The Impact of CVE-2021-27770

The impact of this vulnerability is rated as medium with a base score of 6.8. It mainly affects the confidentiality of the system.

Technical Details of CVE-2021-27770

Let's delve into the technical specifics of this vulnerability.

Vulnerability Description

The flaw resides within the "FaviconService", enabling attackers to send arbitrary HTTP requests, potentially leading to unauthorized access or data leakage.

Affected Systems and Versions

HCL Sametime version 11.6 is affected by this vulnerability.

Exploitation Mechanism

The vulnerability allows threat actors to manipulate the base64-encoded URL in the FaviconService, leading to unauthorized HTTP requests.

Mitigation and Prevention

Discover how to address and prevent the CVE-2021-27770 vulnerability.

Immediate Steps to Take

Users should apply the latest security patches provided by HCL Software to mitigate the risk of exploitation.

Long-Term Security Practices

Implement a robust web security policy and conduct regular security audits to identify and remediate vulnerabilities proactively.

Patching and Updates

Regularly check for security updates and patches released by HCL Software to keep the system secure against potential threats.