CVE-2019-7483 in SMA100
Summary
by MITRE
In SonicWall SMA100, an unauthenticated Directory Traversal vulnerability in the handleWAFRedirect CGI allows the user to test for the presence of a file on the server.
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Analysis
by VulDB Data Team • 02/06/2025
The CVE-2019-7483 vulnerability represents a critical directory traversal flaw affecting SonicWall SMA100 security appliances, specifically within the handleWAFRedirect CGI component. This vulnerability exposes the device to unauthorized file system access attempts without requiring authentication credentials, creating a significant security risk for organizations relying on these network security devices. The issue stems from insufficient input validation in the web application's handling of user-supplied parameters, allowing attackers to manipulate file path references and potentially access sensitive system files or directories.
The technical implementation of this vulnerability leverages the handleWAFRedirect CGI script which processes requests containing directory traversal sequences such as ../ or ..\ that should normally be restricted. When the application fails to properly sanitize these inputs, attackers can craft malicious requests that traverse the file system hierarchy, enabling them to probe for the existence of specific files on the server. This particular weakness falls under CWE-22, which specifically addresses improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal attacks. The vulnerability operates at the application layer, targeting the web interface of the SonicWall appliance and demonstrating how inadequate input validation can lead to information disclosure and potential system compromise.
From an operational standpoint, this vulnerability presents a substantial risk to organizations using SonicWall SMA100 appliances as it allows attackers to perform reconnaissance activities without authentication. The ability to test for file presence on the server enables threat actors to map the system's file structure, potentially identifying sensitive configuration files, credential storage locations, or other system components that could aid in further exploitation. The impact extends beyond simple information gathering since this reconnaissance capability can serve as a precursor to more sophisticated attacks including privilege escalation, data exfiltration, or system compromise. Network defenders must consider that this vulnerability could be exploited as part of a broader attack campaign, particularly when combined with other reconnaissance techniques or vulnerabilities within the same network infrastructure.
Organizations should implement immediate mitigations including applying the vendor-provided security patches released for this vulnerability, which typically involve proper input validation and sanitization of user-supplied parameters in the affected CGI script. Network segmentation and access controls should be strengthened to limit exposure of the affected appliance to untrusted networks, while monitoring systems should be configured to detect suspicious requests containing directory traversal sequences. The vulnerability also highlights the importance of following security best practices such as the principle of least privilege, regular security assessments, and maintaining current threat intelligence to identify similar vulnerabilities in other network components. Additionally, implementing web application firewalls and intrusion detection systems can provide additional layers of protection against exploitation attempts targeting this type of vulnerability, aligning with defensive strategies recommended in the MITRE ATT&CK framework for web application attacks.