CVE-2000-1098 in SOHO Firewall
Summary
by MITRE
The web server for the SonicWALL SOHO firewall allows remote attackers to cause a denial of service via an empty GET or POST request.
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Analysis
by VulDB Data Team • 04/06/2019
The SonicWALL SOHO firewall represents a widely deployed network security solution designed to protect small office and home office environments from external threats. These devices serve as critical gateways between internal networks and the internet, providing firewall capabilities, intrusion prevention, and often web-based management interfaces. The vulnerability described in CVE-2000-1098 specifically targets the web server component that administrators use to configure and monitor the firewall settings, creating a significant security risk when exploited by remote attackers. This flaw exists within the HTTP request handling mechanism of the SonicWALL firewall's embedded web server implementation.
The technical flaw manifests when the web server processes empty GET or POST requests sent by remote attackers. This represents a classic input validation vulnerability where the system fails to properly handle malformed or empty requests that should be rejected during the initial parsing phase. The web server implementation does not adequately validate the length or content of HTTP requests before processing them, leading to a condition where empty requests can trigger unexpected behavior within the server's request handling code. This vulnerability aligns with CWE-400, which addresses unspecified errors in resource management, and CWE-20, which covers improper input validation. The flaw essentially allows an attacker to send a malformed HTTP request containing no data in the request body or query parameters, causing the web server to either crash or enter a state where it becomes unresponsive to further legitimate requests.
The operational impact of this vulnerability extends beyond simple service disruption, as it creates a persistent denial of service condition that can render the firewall management interface completely inaccessible. When exploited successfully, remote attackers can effectively lock out legitimate administrators from managing their firewall configuration, potentially leaving the network exposed to other threats during the period when the management interface is unavailable. This vulnerability is particularly concerning because it affects the web administration interface, which is often the primary method for network administrators to monitor and configure firewall rules, making the impact more severe than a simple service interruption. The attack requires minimal technical expertise and can be executed remotely without authentication, making it a significant risk for organizations that rely on SonicWALL SOHO firewalls for network protection. According to ATT&CK framework, this vulnerability maps to T1499.004, which covers network denial of service attacks, and T1566.002, which addresses spearphishing via web applications.
Mitigation strategies for this vulnerability should include immediate firmware updates from SonicWALL to address the specific web server implementation flaw. Network administrators should also implement network segmentation to limit direct access to the firewall management interface from untrusted networks, while configuring access control lists to restrict management interface access to known good IP addresses only. Additional protective measures include implementing intrusion detection systems that can monitor for suspicious HTTP request patterns and deploying network monitoring tools to detect when the firewall management interface becomes unresponsive. Organizations should also consider disabling the web management interface entirely if it is not required for operations, relying instead on command-line interface access or dedicated management tools. The vulnerability demonstrates the critical importance of proper input validation in web server implementations and highlights the need for security-conscious development practices that consider edge cases and malformed input scenarios.