CVE-2026-55975: H.VIEW HV-500S6 IP Camera Command Injection Detection and Remediation

The CISA ICS Advisory (ICSA-26-176-05) released today highlights a critical security flaw in the H.VIEW HV-500S6 IP Camera. Designated as CVE-2026-55975, this vulnerability carries a CVSS v3 score of 7.2, posing a significant risk to the Commercial Facilities critical infrastructure sector. The flaw allows an authenticated attacker to execute arbitrary operating system commands and upload malicious files due to improper neutralization of special elements and unrestricted file uploads. Given the prevalence of these devices in edge environments and physical security perimeters, compromise can serve as a beachhead for lateral movement into the core network. Immediate action is required to identify and remediate affected devices.

Technical Analysis

Affected Products and Versions

• Product: H.VIEW HV-500S6 IP Camera
• Affected Version: IPCAM_V4.06.88.251229
• Sector: Critical Infrastructure (Commercial Facilities)

Vulnerability Details

The advisory identifies two primary weaknesses that lead to Remote Code Execution (RCE):

1. CVE-2026-55975 (OS Command Injection): The web interface fails to properly sanitize user-supplied input. An authenticated attacker can inject OS commands (e.g., via shell metacharacters like ;, |, or &) into parameters processed by the underlying operating system. This bypasses the intended application logic and executes commands at the system level.
2. Unrestricted Upload of File with Dangerous Type: The application allows file uploads without sufficient validation on file types or content. Attackers can upload web shells or malicious binaries (e.g., ELF executables for the underlying Linux architecture) and execute them, potentially leveraging the command injection vulnerability to run the uploaded payload.

Attack Chain

1. Reconnaissance: Attacker identifies the H.VIEW device on the network (often accessible via web management ports like 80, 443, or 8080).
2. Authentication: Attacker obtains credentials (default credentials are common in IoT, or via brute force). Note: The vulnerability requires authentication, raising the bar slightly, but not stopping determined adversaries.
3. Exploitation: Attacker sends a crafted HTTP request containing OS command metacharacters to the vulnerable endpoint.
4. Payload Execution: The device executes the injected command.
5. Persistence: The attacker uploads a malicious file (web shell or reverse proxy) to maintain access.

Exploitation Status

At the time of this advisory, exploitation is theoretical but highly likely given the presence of a CVSS 7.2 score and the public release of technical details by CISA. Defenders should assume active scanning for vulnerable devices is imminent.

Detection & Response

SIGMA Rules

The following Sigma rules detect the exploitation attempts via network traffic analysis and identify the potential result of the vulnerability (web server spawning a shell).

---
title: H.VIEW IP Camera OS Command Injection Attempt
id: 45a8e9d1-3d4f-4c1a-9a2b-7f8c9d0e1a2b
status: experimental
description: Detects potential OS command injection attempts against H.VIEW IP cameras by identifying shell metacharacters in HTTP URI parameters.
references:
  - https://www.cisa.gov/news-events/ics-advisories/icsa-26-176-05
author: Security Arsenal
date: 2026/04/17
tags:
  - attack.initial_access
  - attack.t1190
  - attack.execution
  - attack.t1059.004
logsource:
  category: webserver
  product: apache
detection:
  selection:
    c-uri|contains:
      - ';'
      - ' | '
      - '&&'
      - '`'
      - '$('
    cs-host|contains:
      - 'H.VIEW'
  condition: selection
falsepositives:
  - Legitimate system administration (rare)
level: high
---
title: IP Camera Web Server Spawning Shell Process
id: b6c7f0e2-4e5g-5h2i-0j3k-8l9m0n1o2p3q
status: experimental
description: Detects the web server process of an IP camera (often running as root or www-data) spawning a shell (sh/bash), indicative of successful RCE.
references:
  - https://www.cisa.gov/news-events/ics-advisories/icsa-26-176-05
author: Security Arsenal
date: 2026/04/17
tags:
  - attack.execution
  - attack.t1059.004
logsource:
  category: process_creation
  product: linux
detection:
  selection:
    ParentImage|endswith:
      - '/httpd'
      - '/lighttpd'
      - '/nginx'
    Image|endswith:
      - '/sh'
      - '/bash'
      - '/busybox'
  condition: selection
falsepositives:
  - Authorized administrative scripts
level: critical

KQL (Microsoft Sentinel / Defender)

This query hunts for suspicious outbound connections from the IP Camera subnet, indicating a potential reverse shell or data exfiltration after exploitation.

let CameraSubnets = dynamic(["192.168.1.0/24", "10.0.10.0/24"]); // Update with your specific IoT VLANs
DeviceNetworkEvents
| where Timestamp > ago(1d)
| where IPV4MatchesIP(DeviceIP, CameraSubnets)
| where InitiatingProcessVersionInfoCompanyName contains "H.VIEW" or InitiatingProcessFileName in~("httpd", "webserver", "dvr")
// Hunt for non-standard ports often used for reverse shells
| where RemotePort !in (80, 443, 554, 8000, 8080)
| summarize count() by DeviceIP, RemotePort, RemoteIP, InitiatingProcessFileName
| where count_ < 10 // Filter out chatter, focus on spikes

Velociraptor VQL

This artifact hunts for the presence of suspicious shell scripts or uploaded binaries in common writable web directories, which may result from the unrestricted file upload vulnerability.

-- Hunt for suspicious file uploads on IP Camera Linux OS
SELECT FullPath, Size, Mtime, Mode
FROM glob(globs="/*/")
WHERE Name =~ "upload" OR Name =~ "tmp"
-- List files in these directories looking for web shells or scripts
SELECT FullPath, Size, Mtime, Mode
FROM glob(globs="/var/www/html/uploads/*")
WHERE Mode =~ "x" -- Look for executable files
   OR Name =~ "\.(sh|php|pl|py|elf)$"

Remediation Script (Bash)

This script performs a network sweep to identify devices on the local subnet responding on port 80 with a H.VIEW server header, helping you map the affected asset footprint. Note: Actual patching requires a firmware update from the vendor.

#!/bin/bash

# H.VIEW Camera Discovery Script
# Usage: sudo ./scan_hview.sh <subnet> (e.g., 192.168.1.0/24)

SUBNET=$1
if [ -z "$SUBNET" ]; then
  echo "Usage: $0 <subnet>"
  exit 1
fi

echo "Scanning subnet $SUBNET for H.VIEW devices on port 80..."

# Using nmap to scan port 80 and grab the HTTP Server Header
nmap -p 80 --open -sV $SUBNET 2>/dev/null | grep -A 3 "H.VIEW"

echo "Scan complete. Please verify firmware versions IPCAM_V4.06.88.251229 manually via the web interface."

Remediation

1. Patch Firmware: Immediately apply the updated firmware provided by H.VIEW that addresses CVE-2026-55975. Ensure the version is strictly newer than IPCAM_V4.06.88.251229.
2. Network Segmentation: Isolate IP cameras into a dedicated IoT VLAN. Restrict inbound and outbound traffic to strictly necessary protocols (e.g., RTSP for video). Block internet access from these devices entirely if possible.
3. Credential Hygiene: Ensure default credentials are not in use. Enforce strong, unique passwords for the admin interface.
4. Review CISA Advisory: Refer to CISA ICSA-26-176-05 for the specific vendor contact information and detailed technical mitigation steps.
5. Disable Unused Services: If the device allows, disable the web management interface from the WAN side and only allow access via VPN or local management network.

Related Resources

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