Tuesday, June 25, 2024

Hackers Bypass Cloudflare Firewall and DDoS Protections using Cloudflare

Cloudflare, a prominent cybersecurity vendor renowned for its web protection services, faces a security challenge that could expose its customers to unforeseen risks. 

A recent disclosure from Certitude highlights a vulnerability that could allow attackers to bypass certain protection mechanisms offered by Cloudflare, leaving customers susceptible to attacks that the platform is designed to prevent.

Vulnerability Overview:

In their official documentation, Cloudflare outlines various mechanisms to safeguard origin servers from malicious traffic. 

However, this disclosure has shed light on a crucial gap in protection that stems from a trust relationship between Cloudflare and its customers’ websites. 

Attackers who use their Cloudflare accounts to abuse this trust relationship can exploit this trust relationship, rendering configured security measures ineffective.

1. Authenticated Origin Pulls:

One of the mechanisms affected is “Authenticated Origin Pulls,” which is considered “very secure” by Cloudflare. This method relies on client SSL certificates to authenticate connections between Cloudflare’s reverse proxy servers and the origin server. 

The issue arises when customers opt for the convenience of using Cloudflare’s certificate. This choice allows any connection originating from Cloudflare, regardless of the tenant, to be accepted. 

Attackers can exploit this by setting up a custom domain, pointing it to the victim’s IP address, and then bypassing protection features configured by the victim.

2. Allowlist Cloudflare IP addresses:

Another mechanism, “Allowlist Cloudflare IP addresses,” is labeled as “moderately secure.” It relies on rejecting connections that don’t originate from Cloudflare’s IP address ranges. 

Similar to authenticated origin pulls, this mechanism has a vulnerability that allows all connections from Cloudflare, regardless of the tenant, to be permitted. 

Attackers can exploit this by directing their attacks through Cloudflare’s infrastructure while bypassing the victim’s protection features.

Cloudflare customers should consider these vulnerabilities seriously and review their protection strategies. 

For the “Allowlist Cloudflare IP addresses” mechanism, it’s recommended to use Cloudflare Aegis, which provides dedicated egress IP addresses instead of shared IP address ranges. Additionally, for “Authenticated Origin Pulls,” customers should opt for custom certificates to ensure better security.

Cloudflare has been made aware of these vulnerabilities, and it is hoped that they will implement protection mechanisms to mitigate these risks and provide clearer guidance to customers with weak configurations.

Protect yourself from vulnerabilities using Patch Manager Plus to quickly patch over 850 third-party applications. Take advantage of the free trial to ensure 100% security.

Website

Latest articles

Threat Actor Claiming a 0-day in Linux LPE Via GRUB bootloader

A new threat actor has emerged, claiming a zero-day vulnerability in the Linux GRUB...

LockBit Ransomware Group Claims Hack of US Federal Reserve

The notorious LockBit ransomware group has claimed responsibility for hacking the U.S. Federal Reserve,...

Microsoft Power BI Vulnerability Let Attackers Access Organizations Sensitive Data

A vulnerability in Microsoft Power BI allows unauthorized users to access sensitive data underlying...

Consulting Companies to Pay $11 Million Failing Cybersecurity Requirements

Two consulting companies, Guidehouse Inc. and Nan McKay and Associates, have agreed to pay...

New RAT Malware SneakyChef & SugarGhost Attack Windows Systems

Talos Intelligence has uncovered a sophisticated cyber campaign attributed to the threat actor SneakyChef....

Chinese Winnti Group Intensifies Financially Motivated Attacks

Hackers are increasingly executing financially motivated attacks and all due to the lucrative potential...

PrestaShop Website Under Injection Attack Via Facebook Module

A critical vulnerability has been discovered in the "Facebook" module (pkfacebook) from Promokit.eu for...
Guru baran
Guru baranhttps://gbhackers.com
Gurubaran is a co-founder of Cyber Security News and GBHackers On Security. He has 10+ years of experience as a Security Consultant, Editor, and Analyst in cybersecurity, technology, and communications.

Free Webinar

API Vulnerability Scanning

71% of the internet traffic comes from APIs so APIs have become soft targets for hackers.Securing APIs is a simple workflow provided you find API specific vulnerabilities and protect them.In the upcoming webinar, join Vivek Gopalan, VP of Products at Indusface as he takes you through the fundamentals of API vulnerability scanning..
Key takeaways include:

  • Scan API endpoints for OWASP API Top 10 vulnerabilities
  • Perform API penetration testing for business logic vulnerabilities
  • Prioritize the most critical vulnerabilities with AcuRisQ
  • Workflow automation for this entire process

Related Articles