org.webjars.npm:qs 6.3.1

Direct Vulnerabilities

Known vulnerabilities in the org.webjars.npm:qs package. This does not include vulnerabilities belonging to this package’s dependencies.

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Vulnerability	Vulnerable Version
H Allocation of Resources Without Limits or Throttling org.webjars.npm:qs is a querystring parser that supports nesting and arrays, with a depth limit. Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling via the `parseArrayValue` function when the `comma` option is in use. An attacker can exhaust system memory by submitting a parameter containing a large number of comma-separated values, resulting in the allocation of excessively large arrays. Note: This is only exploitable if the `comma` option is explicitly set to true. `arrayLimit` is properly enforced for index and bracket notation. How to fix Allocation of Resources Without Limits or Throttling? A fix was pushed into the `master` branch but not yet published.	[0,)
H Allocation of Resources Without Limits or Throttling org.webjars.npm:qs is a querystring parser that supports nesting and arrays, with a depth limit. Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling via improper enforcement of the `arrayLimit` option in bracket notation parsing. An attacker can exhaust server memory and cause application unavailability by submitting a large number of bracket notation parameters - like `a[]=1&a[]=2` - in a single HTTP request. How to fix Allocation of Resources Without Limits or Throttling? Upgrade `org.webjars.npm:qs` to version 6.14.1 or higher.	[,6.14.1)
H Prototype Poisoning org.webjars.npm:qs is a querystring parser that supports nesting and arrays, with a depth limit. Affected versions of this package are vulnerable to Prototype Poisoning which allows attackers to cause a Node process to hang, processing an Array object whose prototype has been replaced by one with an excessive length value. Note: In many typical Express use cases, an unauthenticated remote attacker can place the attack payload in the query string of the URL that is used to visit the application, such as `a[__proto__]=b&a[__proto__]&a[length]=100000000`. How to fix Prototype Poisoning? Upgrade `org.webjars.npm:qs` to version 6.11.0 or higher.	[,6.11.0)
H Prototype Override Protection Bypass org.webjars.npm:qs is a querystring parser that supports nesting and arrays, with a depth limit. Affected versions of this package are vulnerable to Prototype Override Protection Bypass. By default `qs` protects against attacks that attempt to overwrite an object's existing prototype properties, such as `toString()`, `hasOwnProperty()`,etc. From `qs` documentation: By default parameters that would overwrite properties on the object prototype are ignored, if you wish to keep the data from those fields either use plainObjects as mentioned above, or set allowPrototypes to true which will allow user input to overwrite those properties. WARNING It is generally a bad idea to enable this option as it can cause problems when attempting to use the properties that have been overwritten. Always be careful with this option. Overwriting these properties can impact application logic, potentially allowing attackers to work around security controls, modify data, make the application unstable and more. In versions of the package affected by this vulnerability, it is possible to circumvent this protection and overwrite prototype properties and functions by prefixing the name of the parameter with `[` or `]`. e.g. `qs.parse("]=toString")` will return `{toString = true}`, as a result, calling `toString()` on the object will throw an exception. Example: `qs.parse('toString=foo', { allowPrototypes: false }) // {} qs.parse("]=toString", { allowPrototypes: false }) // {toString = true} <== prototype overwritten` For more information, you can check out our blog. How to fix Prototype Override Protection Bypass? Upgrade `org.webjars.npm:qs` to version 6.0.4, 6.1.2, 6.2.3, 6.3.2 or higher.	[,6.0.4)[6.1.0,6.1.2)[6.2.0,6.2.3)[6.3.0,6.3.2)

Vulnerability

Vulnerable Version

Allocation of Resources Without Limits or Throttling

org.webjars.npm:qs is a querystring parser that supports nesting and arrays, with a depth limit.

Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling via the parseArrayValue function when the comma option is in use. An attacker can exhaust system memory by submitting a parameter containing a large number of comma-separated values, resulting in the allocation of excessively large arrays.

Note: This is only exploitable if the comma option is explicitly set to true. arrayLimit is properly enforced for index and bracket notation.

How to fix Allocation of Resources Without Limits or Throttling?

A fix was pushed into the master branch but not yet published.

[0,)

Allocation of Resources Without Limits or Throttling

org.webjars.npm:qs is a querystring parser that supports nesting and arrays, with a depth limit.

Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling via improper enforcement of the arrayLimit option in bracket notation parsing. An attacker can exhaust server memory and cause application unavailability by submitting a large number of bracket notation parameters - like a[]=1&a[]=2 - in a single HTTP request.

How to fix Allocation of Resources Without Limits or Throttling?

Upgrade org.webjars.npm:qs to version 6.14.1 or higher.

[,6.14.1)

Prototype Poisoning

org.webjars.npm:qs is a querystring parser that supports nesting and arrays, with a depth limit.

Affected versions of this package are vulnerable to Prototype Poisoning which allows attackers to cause a Node process to hang, processing an Array object whose prototype has been replaced by one with an excessive length value.

Note: In many typical Express use cases, an unauthenticated remote attacker can place the attack payload in the query string of the URL that is used to visit the application, such as a[__proto__]=b&a[__proto__]&a[length]=100000000.

How to fix Prototype Poisoning?

Upgrade org.webjars.npm:qs to version 6.11.0 or higher.

[,6.11.0)

Prototype Override Protection Bypass

org.webjars.npm:qs is a querystring parser that supports nesting and arrays, with a depth limit.

Affected versions of this package are vulnerable to Prototype Override Protection Bypass. By default qs protects against attacks that attempt to overwrite an object's existing prototype properties, such as toString(), hasOwnProperty(),etc.

From qs documentation:

By default parameters that would overwrite properties on the object prototype are ignored, if you wish to keep the data from those fields either use plainObjects as mentioned above, or set allowPrototypes to true which will allow user input to overwrite those properties. WARNING It is generally a bad idea to enable this option as it can cause problems when attempting to use the properties that have been overwritten. Always be careful with this option.

Overwriting these properties can impact application logic, potentially allowing attackers to work around security controls, modify data, make the application unstable and more.

In versions of the package affected by this vulnerability, it is possible to circumvent this protection and overwrite prototype properties and functions by prefixing the name of the parameter with [ or ]. e.g. qs.parse("]=toString") will return {toString = true}, as a result, calling toString() on the object will throw an exception.

Example:

qs.parse('toString=foo', { allowPrototypes: false })
// {}

qs.parse("]=toString", { allowPrototypes: false })
// {toString = true} <== prototype overwritten

For more information, you can check out our blog.

How to fix Prototype Override Protection Bypass?

Upgrade org.webjars.npm:qs to version 6.0.4, 6.1.2, 6.2.3, 6.3.2 or higher.

[,6.0.4)[6.1.0,6.1.2)[6.2.0,6.2.3)[6.3.0,6.3.2)

org.webjars.npm:qs@6.3.1

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Direct Vulnerabilities

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