Researchers Element New Assault Technique to Bypass Fashionable Net Utility Firewalls







Dec 10, 2022Ravie LakshmananNet App Firewall / Net Safety

Web Application Firewalls

A brand new assault methodology can be utilized to bypass net utility firewalls (WAFs) of varied distributors and infiltrate methods, probably enabling attackers to achieve entry to delicate enterprise and buyer data.

Net utility firewalls are a key line of protection to assist filter, monitor, and block HTTP(S) site visitors to and from an internet utility, and safeguard in opposition to assaults akin to cross-site forgery, cross-site-scripting (XSS), file inclusion, and SQL injection.


The generic bypass “entails appending JSON syntax to SQL injection payloads {that a} WAF is unable to parse,” Claroty researcher Noam Moshe stated. “Most WAFs will simply detect SQLi assaults, however prepending JSON to SQL syntax left the WAF blind to those assaults.”

The economic and IoT cybersecurity firm stated its method efficiently labored in opposition to WAFs from distributors like Amazon Net Companies (AWS), Cloudflare, F5, Imperva, and Palo Alto Networks, all of whom have since launched updates to assist JSON syntax throughout SQL injection inspection.

Web Application Firewalls

With WAFs appearing as a safety guardrail in opposition to malicious exterior HTTP(S) site visitors, an attacker with capabilities to get previous the barrier can receive preliminary entry to a goal surroundings for additional post-exploitation.

The bypass mechanism devised by Claroty banks on the shortage of JSON assist for WAFs to craft rogue SQL injection payloads that embrace JSON syntax to skirt the protections.

“Attackers utilizing this novel method might entry a backend database and use extra vulnerabilities and exploits to exfiltrate data by way of both direct entry to the server or over the cloud,” Moshe defined. “It is a harmful bypass, particularly as extra organizations proceed emigrate extra enterprise and performance to the cloud.”

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