CVE-2022-22274 in SonicOS
Summary
by MITRE • 03/26/2022
A Stack-based buffer overflow vulnerability in the SonicOS via HTTP request allows a remote unauthenticated attacker to cause Denial of Service (DoS) or potentially results in code execution in the firewall.
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Analysis
by VulDB Data Team • 03/27/2022
The SonicOS operating system, developed by SonicWall, serves as the foundation for enterprise-grade network security appliances that protect organizations from various cyber threats. This particular vulnerability exists within the HTTP request handling mechanism of the SonicOS firmware, creating a critical security gap that affects numerous SonicWall firewall models. The flaw manifests as a stack-based buffer overflow, a well-documented class of vulnerability that has been extensively categorized under CWE-121, which specifically addresses stack-based buffer overflow conditions. The vulnerability stems from insufficient input validation within the web server component that processes HTTP requests, allowing maliciously crafted payloads to overwrite adjacent memory locations on the stack.
The technical exploitation of this vulnerability occurs when an unauthenticated remote attacker sends a specially crafted HTTP request to the affected SonicWall device. The buffer overflow condition is triggered during the parsing of HTTP headers or parameters, where the system fails to properly validate the length of incoming data before copying it into fixed-size stack buffers. This flaw enables attackers to overwrite return addresses, function pointers, and other critical stack data, potentially leading to arbitrary code execution or complete system compromise. The attack vector is particularly dangerous because it requires no authentication credentials, making it accessible to any remote attacker who can reach the device's HTTP interface. The vulnerability's impact extends beyond simple denial of service, as demonstrated by the potential for code execution, which aligns with ATT&CK technique T1210 for exploiting known vulnerabilities and T1071.005 for application layer protocol usage.
The operational impact of CVE-2022-22274 presents significant risks to organizations relying on SonicWall firewalls for network protection. A successful exploitation can result in complete system compromise, allowing attackers to gain administrative control over the firewall, potentially leading to unauthorized network access, data exfiltration, and complete disruption of network security controls. The DoS aspect of this vulnerability means that even a simple attack can render critical network security infrastructure unavailable, causing business disruption and potentially exposing networks to further attacks. Organizations may face extended downtime during remediation efforts, and the vulnerability could be exploited as part of broader attack campaigns targeting enterprise network security infrastructure. The attack surface is particularly concerning given that SonicWall firewalls are commonly deployed at network perimeters, making them attractive targets for adversaries seeking to establish persistent access or disrupt network communications.
Mitigation strategies for this vulnerability should include immediate firmware updates from SonicWall, as the vendor has released patches addressing the specific buffer overflow condition. Network administrators should implement network segmentation to limit exposure of affected devices to untrusted networks, while also monitoring for suspicious HTTP traffic patterns that may indicate exploitation attempts. The implementation of web application firewalls and intrusion detection systems can help detect and block malicious HTTP requests targeting this vulnerability. Organizations should also conduct thorough vulnerability assessments to identify all affected SonicWall devices within their network infrastructure and prioritize remediation efforts based on risk exposure. Additionally, implementing network monitoring solutions that can detect anomalous HTTP traffic patterns and establishing incident response procedures for dealing with potential exploitation attempts will enhance overall security posture. The vulnerability highlights the importance of regular security updates and proper input validation in network security appliances, as outlined in security frameworks such as NIST SP 800-53 and ISO 27001 controls for secure system development and maintenance.