Overview: A small botnet has leveraged a HTTP/2 vulnerability to cause a record-breaking DDoS attack.
Threat Name: CVE-2023-44487
Risk Factor: Medium
Date: Oct 2023
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What We Know About The HTTP/2 DDoS Attack.
Cloudflare detected an unprecedented DDoS attack on August 25, 2023, reaching a peak of over 201 million requests per second, three times larger than Cloudflare’s previous record. The attack exploited a weakness in the HTTP/2 protocol and was executed by a modest botnet comprising 20,000 machines.
Cloudflare reported that the entire web experiences 1-3 billion requests per second, suggesting that using this method, attackers could concentrate the equivalent of the entire web’s volume of requests on a few specific targets. Similar attacks have also been observed by Google and AWS in recent weeks.
This vulnerability allows an attacker to deplete the victim’s server resources by repeatedly sending and canceling requests in rapid succession, ultimately impacting the targeted website or application.
CISA have added this vulnerability to its known exploit catalogue. https://www.cisa.gov/news-events/alerts/2023/10/10/cisa-adds-five-known-vulnerabilities-catalog
What’s The Impact of the DDos Attack?
The identified vulnerability predominantly poses a threat to the availability of systems. In light of this, if your business relies on external web servers for its operations, it is imperative to take proactive measures to safeguard against potential disruptions. This entails diligently implementing the latest updates for your webservers and fortifying your defenses with resilient Distributed Denial of Service (DDoS) mitigation strategies.
To address this vulnerability effectively, it is crucial to patch all accessible web services that utilize the HTTP/2 protocol. Regularly updating and patching these services is pivotal to staying ahead of potential exploits, ensuring that your systems are fortified against emerging threats.
How Do I Protect My Business?
Incorporating a comprehensive approach to cybersecurity is essential. This involves not only staying current with software updates but also implementing robust DDoS mitigation methods. By doing so, you establish a proactive defense mechanism, capable of swiftly identifying and neutralizing any attempts to exploit vulnerabilities.
In essence, a multi-faceted security strategy is essential for any organisation reliant on external web servers. Through diligent updates, particularly for HTTP/2-utilizing web services, and the implementation of robust DDoS mitigation measures, you fortify your business against potential disruptions, thereby safeguarding the availability of critical systems integral to your operations.
Solace Cyber Recommendations
Swiftly update your webservers by applying the available software updates for Apache, Tomcat, IIS, .NET, nghttp2, and h2o.
Mitigate the impact of potential DDoS attacks on your organisation by implementing DDoS mitigation services.
Solace is ready to support you in ensuring that your security products are up to date with the latest patches and can provide assistance with any inquiries regarding DDoS mitigation methods.
Solace Cyber security specialists can secure your estate with patching and conduct forensic analysis.