SonicWall SMA100 SQL Injection and Unauthorized Information Disclosure Vulnerability (CVE-2019-7481) Security Advisory
Executive & SecOps Summary
SECOPS ASSESSMENTSonicWall SMA100 firmware version 9.0.0.3 and earlier
Unauthenticated remote attackers can exploit a SQL injection vulnerability to gain unauthorized read-only access to sensitive database resources and system information
Immediately upgrade the SMA100 firmware to a patched version (9.0.0.4 or later)
Affected Products & Version Scope
Remediation & Live Workaround Commands
PATCH & WORKAROUND1. Official Patch & Version Upgrade Commands
According to SonicWall's official advisory, administrators must upgrade the SMA100 firmware to version 9.0.0.4 or higher (or the latest 10.x release). Use the management console or CLI to perform the upgrade.
# Verify current firmware version via CLI
show version
# Upgrade Procedure via MySonicWall Portal:
# 1. Log in to your MySonicWall account.
# 2. Download the latest secure firmware image (9.0.0.4+ or 10.2+).
# 3. Navigate to System > Settings > Upload New Firmware in the Web GUI, upload the image, and reboot.2. Temporary Workaround & Hardening Configuration
If immediate patching is not feasible, restrict access to the management interface by implementing strict firewall access control lists (ACLs) to allow only trusted IP addresses.
# Example CLI commands to restrict WAN management access to a trusted IP
configure
address-object ipv4 'Trusted_Admin_IP' host '203.0.113.50'
access-rule from 'WAN' to 'LAN' action 'discard' service 'HTTPS' source 'any'
access-rule from 'WAN' to 'LAN' action 'allow' service 'HTTPS' source 'Trusted_Admin_IP'
commit3. Log Audit & IoC Verification Commands
Inspect web server access logs for common SQL injection patterns (e.g., UNION, SELECT, or database metadata queries) targeting the appliance.
# Search web access logs for potential SQL injection payloads
grep -Ei 'union|select|concat|char|sysdatabases|metadata' /var/log/nginx/access.log
# Monitor SMA100 system logs for unusual authentication failures or database query errorsStop Exposing VPN Ports to the Internet — Switch to Zero-Trust Access
Eliminate public-facing VPN concentrators and firewall management ports with identity-first Zero-Trust Network Access.
Technical Root Cause & Exploitation Mechanics
1. Vulnerability Overview & Root Cause
This vulnerability (CVE-2019-7481) is a SQL injection (CWE-89) vulnerability located within the web management interface and user portal of SonicWall SMA100 series appliances. The root cause is the lack of proper input validation and parameterized queries when handling user-supplied input, allowing unauthenticated remote attackers to manipulate backend database queries.
2. Exploitation Mechanics & Attack Scenario
An attacker can send specially crafted HTTP requests containing malicious SQL payloads to specific endpoints on the SMA100 appliance. Because the input is concatenated directly into database queries without sanitization, the database engine executes the injected commands. This grants the attacker unauthorized read-only access to sensitive data, such as session tokens, user credentials, and configuration details. This vulnerability is actively exploited in the wild and is listed in the CISA KEV catalog.
3. Infrastructure & Business Impact
Since SonicWall SMA100 serves as an SSL-VPN gateway controlling remote access to corporate networks, compromise of this device is critical. Attackers can leverage stolen credentials or session data to bypass authentication, gain initial access to the internal network, and deploy ransomware or exfiltrate proprietary data. The extremely high EPSS score of 0.9991 highlights the imminent threat of exploitation.
Official Vendor Advisories & References
Vulnerability in SonicWall SMA100 allow unauthenticated user to gain read-only access to unauthorized resources. This vulnerablity impacted SMA100 version 9.0.0.3 and earlier.
Frequently Asked SecOps Questions (CVE-2019-7481)
FAQQ1. How critical is CVE-2019-7481 and is it actively exploited in the wild?
CVE-2019-7481 is rated CVSS 7.5 (HIGH) with a 30-day EPSS exploitation probability of 99.9%. It is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, requiring immediate emergency remediation.
Q2. Which vendors and products are affected by CVE-2019-7481?
Primary impacted vendors include sonicwall across sma100. Scope summary: SonicWall SMA100 firmware versions 9.0.0.3 and earlier
Q3. What temporary mitigations or workarounds exist for CVE-2019-7481 before patching?
[Mitigation] Immediately upgrade the SMA100 firmware to a patched version (9.0.0.4 or later) Follow the CLI remediation commands and interactive SecOps checklist on this page to restrict exposure prior to your maintenance window.
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