CVE-2021-35492 : Vulnerability Insights and Analysis

Wowza Streaming Engine through 4.8.11+5 could allow an authenticated, remote attacker to exhaust filesystem resources. The vulnerability arises from inadequate management of available filesystem resources, potentially leading to database errors and unresponsiveness.

Understanding CVE-2021-35492

This section delves into the details of the CVE-2021-35492 vulnerability, its impacts, technical aspects, and mitigation strategies.

What is CVE-2021-35492?

The CVE-2021-35492 vulnerability in Wowza Streaming Engine up to version 4.8.11+5 enables an authenticated remote attacker to deplete filesystem resources. By manipulating the /enginemanager/server/vhost/historical.jsdata vhost parameter, the attacker can cause the system to exhaust available filesystem resources significantly.

The Impact of CVE-2021-35492

Exploiting this vulnerability through the Virtual Host Monitoring segment allows threat actors to request random virtual-host historical data, thereby consuming existing filesystem resources. Successful attacks can lead to severe consequences such as triggering database errors and rendering the device unresponsive to web-based management.

Technical Details of CVE-2021-35492

Let's explore the technical aspects associated with CVE-2021-35492.

Vulnerability Description

The vulnerability in Wowza Streaming Engine arises from the lack of proper management of filesystem resources, leading to a potential exhaustion of these resources when exploited by threat actors.

Affected Systems and Versions

Wowza Streaming Engine versions up to 4.8.11+5 are impacted by CVE-2021-35492, making them vulnerable to filesystem resource depletion attacks by authenticated remote attackers.

Exploitation Mechanism

Threat actors can exploit this vulnerability by manipulating the /enginemanager/server/vhost/historical.jsdata vhost parameter, causing a significant drain on available filesystem resources.

Mitigation and Prevention

Here are the essential steps to address and prevent CVE-2021-35492 from being exploited.

Immediate Steps to Take

Immediate actions involve reviewing the filesystem resource usage, freeing up any exhausted resources, and restoring the system to an operational state. Additionally, monitoring for unusual filesystem consumption is crucial.

Long-Term Security Practices

Implementing robust filesystem management practices, conducting regular security assessments, and staying informed about emerging threats are crucial for long-term security.

Patching and Updates

Ensure timely application of patches and updates released by Wowza to address CVE-2021-35492. Regularly updating the streaming engine software can help mitigate known vulnerabilities and enhance system security.