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Digi One RealPort POST Driver

If a Digi RealPort device is installed, the help file can also be accessed from the o Outbound buffers were not reported as purged after a PurgeComm request by applications using TCP: Typical Settings and reading hundreds of bytes one. RealPort are trademarks or registered trademarks of Digi International, Inc. in the United States and other Digi One IA Key Features. Digi One SP Key Features. delay, MS Post-delay, Inter-character timeout, Timeout, and Send socket. The Digi logo, Connectware logo, RealPort, Digi One, and PortServer are After the queue name, insert an underscore character and the number of the Digi.


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Digi One RealPort POST Driver

This presentation was drawn from research that tried to determine how prevalent and exposed internet-connected serial port servers are.

Digi One SP

The results were pretty scary - authentication was rarely implemented and the types of devices exposed ranged Digi One RealPort POST corporate VPN servers to traffic signal monitors. This post attempts to summarize that presentation, but the deck itself has more details. If you are unfamiliar with serial port servers or looking for some additional background, please consult the FAQ. These devices serve three primary functions Provide remote access to non-networked equipment such as environment controls, industrial automation, and monitoring systems.

Provide remote access, location tracking, and monitoring of physically mobile systems, including vehicles and cargo containers. Provide out-of-band access to network and power equipment for the purpose of recovery in the case of an outage.

Multi-Protocol Conversion Capabilities for Automation Integration Digi International

A typical serial port server is a box the size of a home router with one or more serial ports Digi One RealPort POST one side and an ethernet, wireless, or mobile interface on the other. The serial port is connected to a target device, such as a router, server, or industrial control system, and the serial port server is configured to allow remote access to this port. Some examples of serial port servers are shown below.

Authentication There are three common ways for a user to access a remote serial port They login via telnet, ssh, or the web interface and directly type commands Digi One RealPort POST the serial device. They connect to a specific TCP port that acts as a proxy for the serial port, allowing immediate access to the serial device.

Digi One RealPort Product Detail - Digi International

They configure vendor-specific software to access the serial port over a proprietary protocol. In the first case, the serial port server requires some form of authentication before the user can interact with the serial-connected device. The most secure method is over a SSH session, but unless the attacker Digi One RealPort POST eavesdrop on your connection, even telnet will do in a pinch.

  • Easy Serial-to-Ethernet Connectivity Digi International
  • Serial Offenders: Widespread Flaws in Serial Port Servers
  • Compact Serial Server

In the second case, this is typically a clear-text TCP connection, accessed using the telnet command, and without any imposed authentication by the serial port server. If the serial-connected device requires authentication to access the serial console, this is the only layer of defense. Digi One RealPort POST third case is usually identical, however some protocols RealPort can be configured to use both encryption and shared key authentication.

In practice, however, these are mostly clear-text and unauthenticated as well. In summary, we have a serial port exposed directly to the network. If the serial port is connected to a device that requires authentication, such as a Linux server, or a Cisco IOS router, it is theoretically protected from unauthorized access unless the attacker knows the correct password.


Many serial devices do not require authentication and Digi One RealPort POST assume that if you are physically connected to a serial port, you probably have the right to configure the system. Serial port servers change the authentication model in two significant ways. First, the concept of trusting a physical port goes out the window when that port is exposed to the internet, especially without an initial layer of authentication.

Second, there is a significant difference between a SSH or telnet session and an authenticated serial console. If the user disconnects from Digi One RealPort POST or telnet, the session is closed. This is not the case with serial consoles unless the device automatically logs out due to inactivity. Very few systems support inactivity timers on serial consoles Cisco is one of the exceptions.

An attacker just has to wait for a valid user to authenticate.

Upgrading the Firmware in a Digi One IA Realport - Digi Forum

Once logged in, the attacker can either hijack the serial port connection or wait for them to become idle and then steal a pre-authenticated shell on the target device. The end result is that both the TCP proxy and Digi One RealPort POST access protocols lead to a situation where most of the serial ports they expose either require no authentication Digi One RealPort POST an attacker to access. An analysis of internet-exposed serial port servers uncovered over 13, root shells, system consoles, and administrative interfaces that did not require authentication, many of which had been pre-authenticated by a valid user.

An example of an serial port connected to a pre-authenticated root shell is shown below. FTP banners were used to identify another 8, Digi devices.

Digi One RealPort

Another Lantronix systems were identified using their telnet banners. Web server headers, SSL certificates, and telnet prompts were useful, but generally not conclusive on their own to identify serial port servers. Three sets of data were used to identify open serial consoles.


Digi One RealPort POST ports are commonly used by Digi and Lantronix devices as TCP proxies for the first 10 configured serial ports. Second, the raw responses for port were analyzed to detect instances of the RealPort proprietary service used by Digi serial port servers.

Finally, the devices running the RealPort service were queried to obtain the banners from each attached serial ports. The final result was a set of banners that could be matched against common serial console and device menu fingerprints.

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