ISP TR-069 Security Research

Note: Certain credentials and internal IP addresses have been redacted from this publication for responsible disclosure.

Research Overview

This research involved analyzing the TR-069 management configuration of a Nokia GPON router to investigate the security of the ISP’s remote management channel.

Target

TR-069 (CWMP) remote management configuration on Nokia G-0425G-B GPON Router

Research Objective

To understand how the ISP remotely manages customer routers, evaluate the encryption and authentication mechanisms, and identify potential security risks in the management architecture.

Methodology

The research employed:

• Router web interface analysis — Reviewing TR-069 configuration page
• Config extraction — Reading router settings via CLI/SSH
• Passive analysis — Documenting the management channel without sending unauthorized requests

Technical Analysis

TR-069 Configuration

Parameter	Value
Periodic Inform	Enabled
Inform Interval	1800 seconds (30 minutes)
ACS URL	http://10.35.x.x:8080
Protocol	HTTP (no encryption)
ACS Username	[redacted]
Connection Request Username	[redacted]

Key Findings

Finding	Detail
Unencrypted management channel	HTTP instead of HTTPS
Internal ACS server	On the ISP’s internal network (10.35.x.x)
Shared credentials	ACS password appears same across deployed routers
Frequent check-ins	Router phones home every 30 minutes
Default connection request username	Factory-default value left unchanged

Architecture

Internet
    ↓
ISP Internal Network (10.35.x.x)
    ├── ACS Server (10.35.x.x:8080)
    │       ↓ HTTP (unencrypted)
    ├── Your Router
    ├── Neighbor's Router
    └── ...every customer device

Credential Exposure

The ACS credentials are visible in the router’s web interface. The same credentials appear to be used across all routers deployed by this ISP. Combined with HTTP transport, this means:

1. Anyone on the ISP’s internal network can capture ACS credentials via passive sniffing
2. The captured credentials authenticate to the ACS server
3. The ACS server can push configuration to any managed router
4. Mass compromise of all customer routers is theoretically possible

Additional Risks

• No TLS client certificates — Basic username/password only
• Connection request password — Also stored in plaintext in web interface
• No network segmentation — Customer routers can potentially reach the ACS server

Security Impact

The TR-069 channel is a single point of failure for all routers managed by this ISP. Compromise of the ACS server or capture of the shared credentials could allow:

• WiFi password extraction from all customer routers
• DNS redirection for phishing
• Malicious firmware deployment
• Mass router bricking or botnet recruitment

Recommendations

1. Encrypt TR-069 with TLS — deploy certificates on ACS and routers
2. Use unique per-device credentials — no shared passwords
3. Segment the management network — isolate ACS from customer traffic
4. Implement IP allowlisting — restrict ACS access to known infrastructure
5. Regular credential rotation — change ACS passwords periodically

Disclosure

Findings were documented with a focus on architecture rather than providing actionable exploitation steps. The research highlights systemic weaknesses rather than specific attack chains.