Sumavision Enhanced Multimedia Router (EMR) 3.0.4.27 Arbitrary Administrator Creation & CSRF Vulnerability (CVE-2020-10181) Technical Advisory
Executive & SecOps Summary
SECOPS ASSESSMENTSumavision Enhanced Multimedia Router (EMR) version 3.0.4.27 and potentially prior firmware versions.
Unauthenticated remote attackers can create arbitrary accounts with administrative privileges via CSRF or direct HTTP requests, leading to complete device compromise.
Restrict external access to the web management interface, deploy WAF rules to block malicious parameter patterns, and apply the latest secure firmware from the vendor.
Affected Products & Version Scope
Remediation & Live Workaround Commands
PATCH & WORKAROUND1. Official Patch & Version Upgrade Commands
Contact Sumavision technical support to obtain the patched firmware version. To apply the firmware update via the device CLI, use the following command sequence:
# Download the secure firmware image from a local TFTP server
tftp -g -r emr_secure_v3.0.5.bin <TFTP_SERVER_IP>
# Flash the secure firmware image to the device
system upgrade emr_secure_v3.0.5.bin
# Reboot the system to apply the changes
system reboot2. Temporary Workaround & Hardening Configuration
If patching cannot be immediately performed, restrict access to the web management interface (ports 80 and 443) using firewall rules to ensure only trusted administrator IPs can access the device.
# Block all external web traffic to the management ports except from a trusted admin IP (e.g., 192.168.10.50)
iptables -A INPUT -p tcp -s 192.168.10.50 --dport 80 -j ACCEPT
iptables -A INPUT -p tcp -s 192.168.10.50 --dport 443 -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP3. Log Audit & IoC Verification Commands
Inspect the web server access logs for unauthorized POST requests targeting the vulnerable endpoint and containing the specific delimiter pattern.
# Search access logs for exploitation attempts targeting the formEMR30 endpoint
grep -i 'formEMR30' /var/log/httpd/access_log | grep -E 'setString=.*<\*1\*>'
# Audit the system accounts to identify any unauthorized administrative users
cat /etc/passwdStop 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-2020-10181) exists in the web management interface of the Sumavision Enhanced Multimedia Router (EMR) 3.0.4.27, specifically within the goform/formEMR30 endpoint. The endpoint fails to implement proper session validation, CSRF token verification, and input sanitization when processing user creation and privilege assignment requests. This allows unauthenticated attackers to register arbitrary administrative accounts.
2. Exploitation Mechanics & Attack Scenario
An attacker sends an unauthenticated HTTP POST request to the goform/formEMR30 endpoint. The request contains the setString parameter formatted with a specific delimiter, such as setString=new_user<*1*>administrator<*1*>123456. The internal parser splits this string using the <*1*> delimiter to extract the username, privilege level, and password, subsequently creating the account with full administrator rights. This can be executed directly or via Cross-Site Request Forgery (CSRF) targeting an authenticated administrator's browser session.
3. Infrastructure & Business Impact
Sumavision EMR devices are critical components in broadcasting and multimedia distribution networks. Successful exploitation allows attackers to gain full administrative control over the device, enabling them to disrupt broadcasting signals, modify configurations, or cause complete service outages. Given its inclusion in the CISA KEV catalog, active exploitation has been observed, making immediate remediation critical.
Official Vendor Advisories & References
goform/formEMR30 in Sumavision Enhanced Multimedia Router (EMR) 3.0.4.27 allows creation of arbitrary users with elevated privileges (administrator) on a device, as demonstrated by a setString=new_user<*1*>administrator<*1*>123456 request.
Frequently Asked SecOps Questions (CVE-2020-10181)
FAQQ1. How critical is CVE-2020-10181 and is it actively exploited in the wild?
CVE-2020-10181 is rated CVSS 9.8 (CRITICAL) with a 30-day EPSS exploitation probability of 14.9%. It is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, requiring immediate emergency remediation.
Q2. Which vendors and products are affected by CVE-2020-10181?
Primary impacted vendors include sumavision across enhanced multimedia router. Scope summary: Sumavision Enhanced Multimedia Router (EMR) version 3.0.4.27
Q3. What temporary mitigations or workarounds exist for CVE-2020-10181 before patching?
[Mitigation] Restrict external access to the web management interface, deploy WAF rules to block malicious parameter patterns, and apply the latest secure firmware from the vendor. Follow the CLI remediation commands and interactive SecOps checklist on this page to restrict exposure prior to your maintenance window.
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