Nx 10 Pdf
Nx-10-2020
Siemens Nx 10
Set Up Horizon Hobby Nx-10 Instructions

Overview

Missouri University of Science and Technology – Missouri S&T. Product Family Liebert NX 10-30kVA UPS. Liebert NX is a true on-line, double conversion, three phase UPS system that delivers complete, centralized power protection for mission-critical systems.

yargs-parser is a mighty option parser used by yargs.

Affected versions of this package are vulnerable to Prototype Pollution. The library could be tricked into adding or modifying properties of Object.prototype using a __proto__ payload.

Our research team checked several attack vectors to verify this vulnerability:

It could be used for privilege escalation.
The library could be used to parse user input received from different sources:
- terminal emulators
- system calls from other code bases
- CLI RPC servers

PoC by Snyk

Details

Prototype Pollution is a vulnerability affecting JavaScript. Prototype Pollution refers to the ability to inject properties into existing JavaScript language construct prototypes, such as objects. JavaScript allows all Object attributes to be altered, including their magical attributes such as _proto_, constructor and prototype. An attacker manipulates these attributes to overwrite, or pollute, a JavaScript application object prototype of the base object by injecting other values. Properties on the Object.prototype are then inherited by all the JavaScript objects through the prototype chain. When that happens, this leads to either denial of service by triggering JavaScript exceptions, or it tampers with the application source code to force the code path that the attacker injects, thereby leading to remote code execution.

There are two main ways in which the pollution of prototypes occurs:

Unsafe Object recursive merge
Property definition by path

Unsafe Object recursive merge

The logic of a vulnerable recursive merge function follows the following high-level model:

When the source object contains a property named _proto_ defined with Object.defineProperty() , the condition that checks if the property exists and is an object on both the target and the source passes and the merge recurses with the target, being the prototype of Object and the source of Object as defined by the attacker. Properties are then copied on the Object prototype.

Clone operations are a special sub-class of unsafe recursive merges, which occur when a recursive merge is conducted on an empty object: merge({},source).

lodash and Hoek are examples of libraries susceptible to recursive merge attacks.

Property definition by path

There are a few JavaScript libraries that use an API to define property values on an object based on a given path. The function that is generally affected contains this signature: theFunction(object, path, value)

If the attacker can control the value of “path”, they can set this value to _proto_.myValue. myValue is then assigned to the prototype of the class of the object.

Nx 10 Pdf

Types of attacks

Nx-10-2020

There are a few methods by which Prototype Pollution can be manipulated:

Type	Origin	Short description
Denial of service (DoS)	Client	This is the most likely attack. DoS occurs when `Object` holds generic functions that are implicitly called for various operations (for example, `toString` and `valueOf`). The attacker pollutes `Object.prototype.someattr` and alters its state to an unexpected value such as `Int` or `Object`. In this case, the code fails and is likely to cause a denial of service. For example: if an attacker pollutes `Object.prototype.toString` by defining it as an integer, if the codebase at any point was reliant on `someobject.toString()` it would fail.
Remote Code Execution	Client	Remote code execution is generally only possible in cases where the codebase evaluates a specific attribute of an object, and then executes that evaluation. For example:`eval(someobject.someattr)`. In this case, if the attacker pollutes `Object.prototype.someattr` they are likely to be able to leverage this in order to execute code.
Property Injection	Client	The attacker pollutes properties that the codebase relies on for their informative value, including security properties such as cookies or tokens. For example: if a codebase checks privileges for `someuser.isAdmin`, then when the attacker pollutes `Object.prototype.isAdmin` and sets it to equal `true`, they can then achieve admin privileges.

Affected environments

The following environments are susceptible to a Prototype Pollution attack:

Application server
Web server

How to prevent

Freeze the prototype— use Object.freeze (Object.prototype).
Require schema validation of JSON input.
Avoid using unsafe recursive merge functions.
Consider using objects without prototypes (for example, Object.create(null)), breaking the prototype chain and preventing pollution.
As a best practice use Map instead of Object.

Siemens Nx 10

For more information on this vulnerability type:

Remediation

Upgrade yargs-parser to version 5.0.1, 13.1.2, 15.0.1, 18.1.1 or higher.

References

Whether you are a seasoned NX user or a novice, the NX 10 tutorial e-book will provide you with the means to begin designing at your own pace. Created by Dr. Ming C. Leu with Amir Ghazanfari and Krishna Kolan from the Department of Mechanical Aerospace Engineering, Missouri University of Science and Technology, this 200-page tutorial highlights the enhanced design flexibility and higher productivity levels of this version over NX 9.

The self-guiding tutorial takes the reader through a step-by-step approach to learn NX 10, even with no previous experience with NX. Seasoned NX users can quickly learn the new interfaces and functions in the NX 10 version.

Dr. Leu has been releasing tutorials since Unigraphics 18, including NX 2, NX 3, NX 5, NX 7, NX 9, and NX 10. Tutorial readers will be guided through each level of use, from starting an NX 10 session to model creation and design elements with various applications. Each chapter contains screenshots and call out boxes meant to more easily explain the process in a quick-reference-guide style.

Set Up Horizon Hobby Nx-10 Instructions

If you have questions or comments about the tutorial, Dr. Leu includes his contact information on the e-book introduction. https://web.mst.edu/~mleu/