[Securecrt 5.5 Serial Number
Jamar Lizarraga
VanDyke Software delivers a terminal emulation and secure remote access program with more robust session management capabilities. The ability to save a number of settings and configurations and multiple ways to organize your sessions saves users time and increases the ease with which they can work with active sessions.
Many terminal emulators do not let you save session data, forcing you to manually enter host IDs and logon credentials, define protocols and authentication methods, etc. every time. With SecureCRT, you can input connection information once, save it, and then quickly launch saved sessions from the Session Manager, the Connect bar, even from a desktop shortcut via the command line.
With information for thousands of sessions saved, you need to be able to organize sessions in order to quickly find, connect, and manipulate sessions. SecureCRT's Session Manager allows you to organize sessions into hierarchical folders to create logical groups. All sessions in a particular group may be opened and manipulated at once.
SecureCRT also offers a number of visual displays to help you organize and keep track of activity on all open sessions. The tabbed interface makes it easy to switch between sessions, and the tiled display makes comparing sessions/output easier.
You do not have to start from scratch every time you need to connect to a remote machine. SecureCRT allows you to save session connection information as well as session customization settings so that you can quickly connect to, organize, and work in multiple sessions. Find out how much time SecureCRT's session management capabilities can save you. Download SecureCRT for a free 30-day evaluation.
SecureCRT, SecureFX, VShell, Entunnel, AbsoluteFTP, Basepoint, We Listen. Then We Make Software Better., VanDyke Software, and the VanDyke Software logo are trademarks or registered trademarks of VanDyke Software, Inc. in the United States and/or other countries. All other trademarks or registered trademarks are the property of their respective owners.
Copyright 1995 - VDS_year(); VanDyke Software, Inc. All rights reserved.
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A memory corruption vulnerability (CVE-2020-12651) was fixed in the latest version 8.7.2 of SecureCRT. When the CSI function receives a large negative number as a parameter, it may allow the remote system to destroy the memory in the terminal process, resulting in the execution of arbitrary code or the program crashes.
In addition, for hosts that cannot be fully trusted, avoid using terminal emulation software to connect, and beware of malicious hosts using vulnerabilities in terminal emulation software to harm the host.
This advisory is only used to describe a potential risk. NSFOCUS does not provide any commitment or promise on this advisory. NSFOCUS and the author will not bear any liability for any direct and/or indirect consequences and losses caused by transmitting and/or using this advisory. NSFOCUS reserves all the rights to modify and interpret this advisory. Please include this statement paragraph when reproducing or transferring this advisory. Do not modify this advisory, add/delete any information to/from it, or use this advisory for commercial purposes without permission from NSFOCUS.
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For those who have a need to either modify the existing scripts or write completely new ones for specific tasks (I expect that will be the majority), this section contains documentation on the classes used to simplify script creation.
The purpose of building the below classes is to encapsulate many of the common tasks that will be performed on any device so that those methods can simply be called, instead of requiring each person to either copy and paste a lot of blocks of code, or understand the intricate details of interacting with a remote device through SecureCRT. While that may be required in certain cases, the goal is that a vast majority of the interaction can be handled using the existing methods documented below.
There are 2 categories of modules shown below:1) The modules written to handle the interaction between these scripts and the remote devices (via SecureCRT), and2) 3rd Party modules that are used within some of the scripts to help process our device outputs better.
The code used to interact with SecureCRT is kept in the securecrt_tools module folder. This folder contains both the securecrt_tools and 3rd party modules in addition to a small number of other files. The files that are a part of securecrt_tools are:* scripts.py* sessions.py* utilities.py* settings.py* message_box_const.py
These files break up the code into groupings based on function so that the repository has a better organizational structure. The purpose of the files is explained below, while the documentation of all methods/functions defined in these files is in a later section.
sessions.py - This file contains the code that interacts with a device via SecureCRT. There are methods in this file for connecting to devices, finding the prompt of a device, sending data to a remote device, capturing command output to a variable, writing the output of a command to a file, disconnecting from a device, etc.
settings.py - This file contains the code used to handle the settings.ini file. Functions in this file perform tasks such as reading settings from the INI file, creating the file if it exists, adding missing variables that are required for operation of these scripts, etc.
message_box_const.py - This file, while related to SecureCRT, holds information used in the formatting of message boxes and prompts. These SecureCRT constructs accept an optional number in the function call that dictates the layout of the box (what buttons are available, what icon is in the box, etc). There is a specific number assigned to each option and I have created a list of constants that are assigned the appropriate number. This allows you define the format of the message box by adding together the constants you want into an appropriate value. An example of how to use these constants is in the comments of the file.
This is done by using the class system in Python. For those who understand Object-Oriented Programming and Classes work, both the Script and Session objects have an abstract base class (e.g. class Session) as well as a sub-class for use with SecureCRT (e.g. class CRTSession(Session)) and a subclass for use with your local Python install (e.g. class DebugSession(Session)). There is code at the end of all the provided scripts that will use the CRTSession sub-class if the script is called from SecureCRT and use the DebugSession sub-class when the script is run from the local Python install. This allows us to simulate running the script against a device from our local Python installation, generally by either prompting the user for a file input when the script would gather output from a remote device, or printing to the console instead of creating message boxes on the screen.
For those less familiar with OOP and Classes, the Session abstract base class defines what methods/functions are required to be defined for any class that is a sub-class of Session. For example, the get_command_output() is defined under the Session base class and required to be implemented in both the CRTSession class and the DebugSession class. In the Session base class there is not any code for that method. It is simply defined with nothing but a pass statement in it. Each sub-class implements this method differently, though. The CRTSession class is meant to be used when SecureCRT is launching the script, so it has code that will send the provided command to the device and capture the output returned and save it into a variable. The DebugSession class is meant to be used when the script is run by the local Python interpreter and so we do not have the ability to actually connect to a remote device. Instead, the DebugSession class prompts the user for a filename on the console, and then opens that file and saves the contacts into the variable. In this way, we are simulating a connection to a remote device and can now test our parsing logic on that output without needing to connect to the remote device (except to initially capture a real output to a file to test against).
Because the script file has the code (if you used the provided templates, at least) that detects which program is executing it (SecureCRT or Python directly) and selects the appropriate class type to use, you can write your scripts once with the same method names (e.g. get_command_output() and it will execute differently but appropriately for the way it is being executed.
The background story short:
10 years before I had to support the network guys in their job and I hated typing multiple cli commands every time on many switches just to get an up-to-date topology to help the site in its connectivity issues.
I decided that I will script that activity and have written a little script for securecrt (SecureCRT is very good, it has built in python you can script ssh and do what ever you like on infra devices, like switches or routers or firewalls!)
I used as always graphviz and found no other way to create a visual representation for a switch then an HTML table: