ABB WebPro SNMP Card PowerValue Vulnerabilities (ICSA-26-132-06) — Detection and Mitigation

Introduction

CISA has released ICSA-26-132-06, detailing critical vulnerabilities affecting the ABB WebPro SNMP card used in PowerValue Uninterruptible Power Supplies (UPS). These devices are pivotal in maintaining power availability for operational technology (OT) and critical infrastructure environments. The advisory, based on internally discovered vulnerabilities by ABB, highlights three primary security issues: Improper Authentication (Unauthorized Access), Insufficient Session Expiration, and Uncontrolled Resource Consumption.

With a CVSS v3.1 score of 8.8 (High), these flaws are not theoretical. An attacker situated on the local network can exploit these weaknesses to gain unauthorized administrative control of the UPS, trigger a denial-of-service (DoS) condition rendering power management unavailable, or disrupt session management. In environments where UPS devices are used to safely shut down servers or maintain life-safety systems, the loss of availability or control poses a severe operational risk. Defenders must prioritize the identification of these assets and apply firmware updates immediately.

Technical Analysis

Affected Products and Versions

The vulnerabilities specifically impact the WebPro SNMP Card component of the ABB PowerValue series:

• Product: ABB WebPro SNMP Card PowerValue
• Affected Versions:
  • Version <= 1.1.8.k
  • Version <= 1.1.8.p

CVE and CVSS Details

While the specific CVE identifiers were not explicitly listed in the initial summary, the vulnerabilities are categorized under three distinct weaknesses leading to the aggregate CVSS score:

• Improper Authentication: Allows an attacker on the local network to bypass identity verification mechanisms, gaining administrative access to the device interface.
• Insufficient Session Expiration: Sessions do not terminate appropriately, allowing for resource unavailability or potential session hijacking.
• Uncontrolled Resource Consumption: The web interface fails to limit resource allocation, facilitating a DoS attack that crashes the management card.

Exploitation Requirements

The attack vector requires access to the local network. This does not require internet-facing exposure; however, in converged IT/OT environments, a compromise of a corporate workstation can serve as a pivot point to attack the UPS management interface. Once the attacker has layer 2/3 connectivity, they can exploit the web management interface (typically TCP ports 80 or 443) or the SNMP service (UDP 161).

Exploitation Status

As of this advisory publication, these are internally discovered vulnerabilities. However, the severity (CVSS 8.8) and the inclusion in CISA advisories suggest that functional exploits are feasible. Defenders should assume that active scanning for these devices is occurring by adversaries targeting OT environments.

Detection & Response

SIGMA Rules

The following Sigma rules are designed to run on endpoints initiating connections (to detect lateral movement to the UPS) or on network perimeter devices. Note that direct logging from the embedded SNMP card may not be available in standard SIEMs, so detection relies on monitoring the traffic to the devices.

---
title: Potential ABB WebPro SNMP Card Administrative Access
id: 8f4c2d10-1b5a-4c8e-9a0d-7e6f5a4b3c2d
status: experimental
description: Detects potential administrative access to ABB WebPro interfaces based on known management ports. Requires defining the scope of ICS IP ranges to avoid noise.
references:
 - https://www.cisa.gov/news-events/ics-advisories/icsa-26-132-06
author: Security Arsenal
date: 2026/04/06
tags:
 - attack.initial_access
 - attack.t1190
 - attack.ics
logsource:
 category: network_connection
 product: windows
detection:
 selection:
  DestinationPort|endswith:
   - 80
   - 443
   - 8080
  DestinationIp|cidr: '192.168.100.0/24' # REPLACE WITH YOUR ICS/SUBNET RANGE
  Initiated: true
 condition: selection
falsepositives:
 - Legitimate administrator access to UPS management interface
 - Scanning tools
level: high
---
title: SNMP Set Request (Configuration Change) to ICS Assets
id: 9a5d3e21-2c6b-5d9f-0b1e-8f7a0c6b5d4e
status: experimental
description: Detects SNMP Set requests (Write) directed towards known ICS subnet assets. Unauthorized access flaws often result in configuration changes.
references:
 - https://www.cisa.gov/news-events/ics-advisories/icsa-26-132-06
author: Security Arsenal
date: 2026/04/06
tags:
 - attack.impact
 - attack.t0845 # ICS Attack: Modify Controller Parameter
logsource:
 category: network_connection
 product: windows
detection:
 selection:
  DestinationPort: 161
  DestinationIp|cidr: '10.0.0.0/8' # REPLACE WITH YOUR ICS/SUBNET RANGE
 # Note: SNMP Set detection usually requires deeper packet inspection (DPI) available in Zeek/Packet sensors. This rule relies on endpoint connections.
 condition: selection
falsepositives:
 - Authorized network management systems (NMS) polling
 - Legitimate UPS management software
level: medium

KQL (Microsoft Sentinel / Defender)

This KQL query hunts for excessive connections to the management ports of identified UPS devices, which could indicate a DoS attempt or a brute-force attack against the authentication mechanism.

let ICS_Subnets = dynamic(["192.168.100.0/24", "10.20.30.0/24"]); // Define your OT subnets
let TargetPorts = dynamic([80, 443, 8080, 161]);
DeviceNetworkEvents
| where RemotePort in (TargetPorts)
| where ipv4_is_in_range(RemoteIP, ICS_Subnets)
| summarize Count = count(), DistinctIPs = dcount(LocalIP) by bin(Timestamp, 5m), RemoteIP, RemotePort
| where Count > 100 // Threshold tuning required based on normal polling rates
| project Timestamp, RemoteIP, RemotePort, Count, DistinctIPs
| order by Count desc

Velociraptor VQL

This artifact hunts for established connections to the standard ABB WebPro management ports from an endpoint, useful for identifying compromised workstations that are communicating with UPS infrastructure.

-- Hunt for connections to ABB WebPro SNMP management ports
SELECT F.RemoteAddress, F.RemotePort, F.State, F.Pid, P.Name, P.CommandLine
FROM listen_sockets() AS F
LEFT JOIN pslist() AS P ON F.Pid = P.Pid
WHERE F.RemotePort IN (80, 443, 8080, 161)
  AND F.State =~ 'ESTABLISHED'

Remediation Script (Bash)

This bash script assists network administrators in identifying ABB WebPro SNMP cards on the local network by checking for the web server header or title, which helps in compiling an asset list for patching.

#!/bin/bash

# ABB WebPro SNMP Card Discovery Script
# Use nmap to scan for web interfaces and grep for ABB signatures

if [ -z "$1" ]; then
  echo "Usage: $0 <network_cidr> (e.g., 192.168.1.0/24)"
  exit 1
fi

NETWORK="$1"

echo "[*] Scanning $NETWORK for potential ABB WebPro SNMP Cards (Ports 80/443)..."

# Scan for open ports 80 and 443
nmap -p 80,443 --open -oG - "$NETWORK" | grep "Open" | awk '{print $2}' > /tmp/ips.txt

while read -r ip; do
  echo "[*] Checking $ip for ABB WebPro signature..."
  # Attempt to grab the HTTP title. ABB WebPro often exposes a specific title or server header.
  # Adjust the grep pattern based on actual observed banner in your environment.
  title=$(curl -s --connect-timeout 2 "http://$ip" | grep -i -E "<title>.*ABB.*</title>|WebPro|PowerValue")
  
  if [ ! -z "$title" ]; then
    echo "[!] Potential ABB WebPro Device found at: $ip"
    echo "    Signature: $title"
  fi
done < /tmp/ips.txt

rm /tmp/ips.txt
echo "[*] Scan complete."

Remediation

To mitigate the risks identified in ICSA-26-132-06, security and operations teams must take the following immediate actions:

1. Firmware Update: The primary remediation is to update the WebPro SNMP card firmware. ABB advises updating to the latest available firmware which addresses the issues in versions <= 1.1.8.k and 1.1.8.p. Contact ABB support or check the customer portal to obtain the specific patched firmware version (e.g., versions newer than 1.1.8.k/p).

2. Network Segmentation: Ensure that UPS management interfaces are not accessible from the general corporate IT network or the internet. Place these devices in a dedicated ICS VLAN with strict firewall rules that only allow access from specific administrative jump hosts.

3. Disable Unused Interfaces: If SNMP is not required for monitoring, disable the SNMP service (UDP 161) or restrict it to read-only (RO) community strings with complex secrets. If web management is not frequently used, disable the web server temporarily until patching is complete.

4. Verify Patching: After applying updates, use the provided Bash script or manual checks to verify the firmware version reported in the device web interface has changed successfully.

Official Vendor Advisory:

• CISA ICSA-26-132-06
• ABB Product Security Advisory

Related Resources

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