Schneider Electric U.motion Builder SQL Injection and Remote Code Execution Vulnerability (CVE-2018-7841) Security Advisory
Executive & SecOps Summary
SECOPS ASSESSMENTSchneider Electric U.motion Builder software version 1.3.4
Unauthenticated remote attackers can execute arbitrary code with elevated privileges by injecting malicious SQL commands into vulnerable input fields
Immediately upgrade to the patched version provided by the vendor, or restrict network access to the device from the public internet
Affected Products & Version Scope
Remediation & Live Workaround Commands
PATCH & WORKAROUND1. Official Patch & Version Upgrade Commands
Refer to the Schneider Electric security advisory SEVD-2019-071-02 to obtain and apply the official security patch. For Linux-based host environments, use the package manager to upgrade the software:
# Update package repositories and upgrade the U.motion Builder package
sudo apt-get update && sudo apt-get --only-upgrade install umotion-builder -y2. Temporary Workaround & Hardening Configuration
If patching cannot be applied immediately, restrict access to the U.motion Builder web interface using host-based firewalls (iptables) to allow only authorized administrative subnets:
# Allow access to HTTPS port 443 only from a trusted management subnet (e.g., 10.0.1.0/24)
sudo iptables -A INPUT -p tcp -s 10.0.1.0/24 --dport 443 -j ACCEPT
sudo iptables -A INPUT -p tcp --dport 443 -j DROP3. Log Audit & IoC Verification Commands
Verify the installed version of the software and inspect web server access logs for common SQL injection and command execution payloads:
# 1. Check the installed version of U.motion Builder
dpkg -l | grep -i umotion
# 2. Scan web access logs for SQL injection patterns and shell execution attempts
grep -Ei '(union|select|concat|char|xp_cmdshell|/bin/sh|/bin/bash)' /var/log/nginx/access.logBlock Exploits Instantly with Managed Virtual Patching Rules
Can't patch production immediately? Deploy managed WAF rules at the edge to intercept RCE, SQLi, and deserialization payloads before they hit your origin server.
Technical Root Cause & Exploitation Mechanics
1. Vulnerability Overview & Root Cause
A critical SQL Injection vulnerability (CWE-89) exists in Schneider Electric U.motion Builder software version 1.3.4. The root cause lies in the improper sanitization and lack of parameterization of user-supplied input before incorporating it into database queries, allowing attackers to manipulate backend database operations.
2. Exploitation Mechanics & Attack Scenario
An unauthenticated remote attacker can send specially crafted HTTP requests containing malicious SQL payloads to vulnerable endpoints. By exploiting this SQL injection vector, the attacker can leverage database functions to write files to the web root (e.g., writing a web shell) or execute system commands, effectively escalating the vulnerability to Remote Code Execution (RCE).
3. Infrastructure & Business Impact
With a CVSS score of 9.8 (Critical) and its inclusion in the CISA Known Exploited Vulnerabilities (KEV) catalog, this vulnerability poses an extreme risk. Successful exploitation allows complete compromise of the host system, potentially leading to unauthorized control over building automation systems, operational disruption, and lateral movement within the corporate network.
Official Vendor Advisories & References
A SQL Injection (CWE-89) vulnerability exists in U.motion Builder software version 1.3.4 which could cause unwanted code execution when an improper set of characters is entered.
Frequently Asked SecOps Questions (CVE-2018-7841)
FAQQ1. How critical is CVE-2018-7841 and is it actively exploited in the wild?
CVE-2018-7841 is rated CVSS 9.8 (CRITICAL) with a 30-day EPSS exploitation probability of 72.5%. It is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, requiring immediate emergency remediation.
Q2. Which vendors and products are affected by CVE-2018-7841?
Primary impacted vendors include schneider-electric across u.motion-builder. Scope summary: Schneider Electric U.motion Builder version 1.3.4 (and potentially prior versions)
Q3. What temporary mitigations or workarounds exist for CVE-2018-7841 before patching?
[Mitigation] Immediately upgrade to the patched version provided by the vendor, or restrict network access to the device from the public internet Follow the CLI remediation commands and interactive SecOps checklist on this page to restrict exposure prior to your maintenance window.
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