js-given@0.0.11

Vulnerabilities 9 via 57 paths
Dependencies 160
Source npm
Package js-given

Find, fix and prevent vulnerabilities in your code.

Severity
  • 6
  • 3
Status
  • 9
  • 0
  • 0
high severity

Arbitrary File Overwrite

  • Vulnerable module: fstream
  • Introduced through: machinepack-zip@1.1.0

Detailed paths

  • Introduced through: js-given@0.0.11 machinepack-zip@1.1.0 unzip@0.1.11 fstream@0.1.31

Overview

fstream is an package that supports advanced FS Streaming for Node.

Affected versions of this package are vulnerable to Arbitrary File Overwrite. Extracting tarballs containing a hardlink to a file that already exists in the system and a file that matches the hardlink will overwrite the system's file with the contents of the extracted file.

Remediation

Upgrade fstream to version 1.0.12 or higher.

References

high severity

Arbitrary File Write via Archive Extraction (Zip Slip)

  • Vulnerable module: decompress-zip
  • Introduced through: decompress-zip@0.3.0

Detailed paths

  • Introduced through: js-given@0.0.11 decompress-zip@0.3.0
    Remediation: Upgrade to js-given@0.1.6.

Overview

decompress-zip extracts the contents of the ZIP archive file.

Affected versions of this package are vulnerable to Arbitrary File Write via Archive Extraction (Zip Slip). The package will extract files outside of the scope of the specified target directory because there is no validation that file extraction stays within the defined target path.

Details

It is exploited using a specially crafted zip archive, that holds path traversal filenames. When exploited, a filename in a malicious archive is concatenated to the target extraction directory, which results in the final path ending up outside of the target folder. For instance, a zip may hold a file with a "../../file.exe" location and thus break out of the target folder. If an executable or a configuration file is overwritten with a file containing malicious code, the problem can turn into an arbitrary code execution issue quite easily.

The following is an example of a zip archive with one benign file and one malicious file. Extracting the malicous file will result in traversing out of the target folder, ending up in /root/.ssh/ overwriting the authorized_keys file:


+2018-04-15 22:04:29 ..... 19 19 good.txt

+2018-04-15 22:04:42 ..... 20 20 ../../../../../../root/.ssh/authorized_keys

Remediation

Upgrade decompress-zip to version 0.2.2, 0.3.2 or higher.

References

high severity

Prototype Pollution

  • Vulnerable module: lodash
  • Introduced through: machinepack-zip@1.1.0

Detailed paths

  • Introduced through: js-given@0.0.11 machinepack-zip@1.1.0 archiver@0.14.4 lodash@3.2.0
  • Introduced through: js-given@0.0.11 machinepack-zip@1.1.0 archiver@0.14.4 zip-stream@0.5.2 lodash@3.2.0
  • Introduced through: js-given@0.0.11 machinepack-zip@1.1.0 lodash@3.10.1
  • Introduced through: js-given@0.0.11 machinepack-zip@1.1.0 machine@10.4.0 lodash@3.10.1
  • Introduced through: js-given@0.0.11 machinepack-zip@1.1.0 machine@10.4.0 rttc@7.4.0 lodash@3.10.1
  • Introduced through: js-given@0.0.11 machinepack-zip@1.1.0 machinepack-fs@2.3.0 lodash@2.4.2
  • Introduced through: js-given@0.0.11 machinepack-zip@1.1.0 machinepack-fs@2.3.0 machine@4.1.1 lodash@2.4.2
  • Introduced through: js-given@0.0.11 machinepack-zip@1.1.0 machinepack-fs@2.3.0 machinepack-util@0.7.24 lodash@2.4.2
  • Introduced through: js-given@0.0.11 machinepack-zip@1.1.0 machinepack-fs@2.3.0 machine@4.1.1 rttc@1.0.2 lodash@2.4.2
  • Introduced through: js-given@0.0.11 machinepack-zip@1.1.0 machinepack-fs@2.3.0 machine@4.1.1 switchback@1.1.3 lodash@2.4.2
  • Introduced through: js-given@0.0.11 machinepack-zip@1.1.0 machinepack-fs@2.3.0 machinepack-util@0.7.24 machine@2.0.6 lodash@2.4.2
  • Introduced through: js-given@0.0.11 machinepack-zip@1.1.0 machinepack-fs@2.3.0 machinepack-util@0.7.24 machine@2.0.6 rttc@1.0.2 lodash@2.4.2
  • Introduced through: js-given@0.0.11 machinepack-zip@1.1.0 machinepack-fs@2.3.0 machinepack-util@0.7.24 machine@2.0.6 switchback@1.1.3 lodash@2.4.2

Overview

lodash is a modern JavaScript utility library delivering modularity, performance, & extras.

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

PoC by Snyk

const mergeFn = require('lodash').defaultsDeep;
const payload = '{"constructor": {"prototype": {"a0": true}}}'

function check() {
    mergeFn({}, JSON.parse(payload));
    if (({})[`a0`] === true) {
        console.log(`Vulnerable to Prototype Pollution via ${payload}`);
    }
  }

check();

For more information, check out our blog post

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:

merge (target, source)

  foreach property of source

    if property exists and is an object on both the target and the source

      merge(target[property], source[property])

    else

      target[property] = source[property]

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.

Types of attacks

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

  1. Freeze the prototype— use Object.freeze (Object.prototype).

  2. Require schema validation of JSON input.

  3. Avoid using unsafe recursive merge functions.

  4. Consider using objects without prototypes (for example, Object.create(null)), breaking the prototype chain and preventing pollution.

  5. As a best practice use Map instead of Object.

For more information on this vulnerability type:

Arteau, Oliver. “JavaScript prototype pollution attack in NodeJS application.” GitHub, 26 May 2018

Remediation

Upgrade lodash to version 4.17.12 or higher.

References

high severity

Prototype Pollution

  • Vulnerable module: lodash
  • Introduced through: machinepack-zip@1.1.0

Detailed paths

  • Introduced through: js-given@0.0.11 machinepack-zip@1.1.0 archiver@0.14.4 lodash@3.2.0
  • Introduced through: js-given@0.0.11 machinepack-zip@1.1.0 archiver@0.14.4 zip-stream@0.5.2 lodash@3.2.0
  • Introduced through: js-given@0.0.11 machinepack-zip@1.1.0 lodash@3.10.1
  • Introduced through: js-given@0.0.11 machinepack-zip@1.1.0 machine@10.4.0 lodash@3.10.1
  • Introduced through: js-given@0.0.11 machinepack-zip@1.1.0 machine@10.4.0 rttc@7.4.0 lodash@3.10.1
  • Introduced through: js-given@0.0.11 machinepack-zip@1.1.0 machinepack-fs@2.3.0 lodash@2.4.2
  • Introduced through: js-given@0.0.11 machinepack-zip@1.1.0 machinepack-fs@2.3.0 machine@4.1.1 lodash@2.4.2
  • Introduced through: js-given@0.0.11 machinepack-zip@1.1.0 machinepack-fs@2.3.0 machinepack-util@0.7.24 lodash@2.4.2
  • Introduced through: js-given@0.0.11 machinepack-zip@1.1.0 machinepack-fs@2.3.0 machine@4.1.1 rttc@1.0.2 lodash@2.4.2
  • Introduced through: js-given@0.0.11 machinepack-zip@1.1.0 machinepack-fs@2.3.0 machine@4.1.1 switchback@1.1.3 lodash@2.4.2
  • Introduced through: js-given@0.0.11 machinepack-zip@1.1.0 machinepack-fs@2.3.0 machinepack-util@0.7.24 machine@2.0.6 lodash@2.4.2
  • Introduced through: js-given@0.0.11 machinepack-zip@1.1.0 machinepack-fs@2.3.0 machinepack-util@0.7.24 machine@2.0.6 rttc@1.0.2 lodash@2.4.2
  • Introduced through: js-given@0.0.11 machinepack-zip@1.1.0 machinepack-fs@2.3.0 machinepack-util@0.7.24 machine@2.0.6 switchback@1.1.3 lodash@2.4.2

Overview

lodash is a modern JavaScript utility library delivering modularity, performance, & extras.

Affected versions of this package are vulnerable to Prototype Pollution. The functions merge, mergeWith, and defaultsDeep could be tricked into adding or modifying properties of Object.prototype. This is due to an incomplete fix to CVE-2018-3721.

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:

merge (target, source)

  foreach property of source

    if property exists and is an object on both the target and the source

      merge(target[property], source[property])

    else

      target[property] = source[property]

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.

Types of attacks

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

  1. Freeze the prototype— use Object.freeze (Object.prototype).

  2. Require schema validation of JSON input.

  3. Avoid using unsafe recursive merge functions.

  4. Consider using objects without prototypes (for example, Object.create(null)), breaking the prototype chain and preventing pollution.

  5. As a best practice use Map instead of Object.

For more information on this vulnerability type:

Arteau, Oliver. “JavaScript prototype pollution attack in NodeJS application.” GitHub, 26 May 2018

Remediation

Upgrade lodash to version 4.17.11 or higher.

References

high severity

Regular Expression Denial of Service (DoS)

  • Vulnerable module: minimatch
  • Introduced through: machinepack-zip@1.1.0

Detailed paths

  • Introduced through: js-given@0.0.11 machinepack-zip@1.1.0 archiver@0.14.4 glob@4.3.5 minimatch@2.0.10
    Remediation: Open PR to patch minimatch@2.0.10.

Overview

minimatch is a minimalistic matching library used for converting glob expressions into JavaScript RegExp objects. Affected versions of this package are vulnerable to Regular Expression Denial of Service (ReDoS) attacks.

The Regular expression Denial of Service (ReDoS) is a type of Denial of Service attack. Many Regular Expression implementations may reach edge cases that causes them to work very slowly (exponentially related to input size), allowing an attacker to exploit this and can cause the program to enter these extreme situations by using a specially crafted input and cause the service to excessively consume CPU, resulting in a Denial of Service.

An attacker can provide a long value to the minimatch function, which nearly matches the pattern being matched. This will cause the regular expression matching to take a long time, all the while occupying the event loop and preventing it from processing other requests and making the server unavailable (a Denial of Service attack).

You can read more about Regular Expression Denial of Service (ReDoS) on our blog.

Remediation

Upgrade minimatch to version 3.0.2 or greater.

References

high severity

Resources Downloaded over Insecure Protocol

  • Vulnerable module: js-given
  • Introduced through: js-given@0.0.11

Detailed paths

  • Introduced through: js-given@0.0.11
    Remediation: Upgrade to js-given@0.0.18.

Overview

js-given is a JavaScript frontend to jgiven.

Affected versions of the package are vulnerable to Man in the Middle (MitM) attacks due to downloading resources over an insecure protocol. Without a secure connection, it is possible for an attacker to intercept this connection and alter the packages received. In serious cases, this may even lead to Remote Code Execution (RCE) on your host server.

Remediation

Upgrade js-given to version 0.0.18 or higher.

References

medium severity

Denial of Service (DoS)

  • Vulnerable module: mem
  • Introduced through: yargs@8.0.2

Detailed paths

  • Introduced through: js-given@0.0.11 yargs@8.0.2 os-locale@2.1.0 mem@1.1.0
    Remediation: Upgrade to js-given@0.1.8.

Overview

mem is an optimization used to speed up consecutive function calls by caching the result of calls with identical input.

Affected versions of this package are vulnerable to Denial of Service (DoS). Old results were deleted from the cache and could cause a memory leak.

details

Denial of Service (DoS) describes a family of attacks, all aimed at making a system inaccessible to its intended and legitimate users.

Unlike other vulnerabilities, DoS attacks usually do not aim at breaching security. Rather, they are focused on making websites and services unavailable to genuine users resulting in downtime.

One popular Denial of Service vulnerability is DDoS (a Distributed Denial of Service), an attack that attempts to clog network pipes to the system by generating a large volume of traffic from many machines.

When it comes to open source libraries, DoS vulnerabilities allow attackers to trigger such a crash or crippling of the service by using a flaw either in the application code or from the use of open source libraries.

Two common types of DoS vulnerabilities:

  • High CPU/Memory Consumption- An attacker sending crafted requests that could cause the system to take a disproportionate amount of time to process. For example, commons-fileupload:commons-fileupload.

  • Crash - An attacker sending crafted requests that could cause the system to crash. For Example, npm ws package

Remediation

Upgrade mem to version 4.0.0 or higher.

References

medium severity

Prototype Pollution

  • Vulnerable module: lodash
  • Introduced through: machinepack-zip@1.1.0

Detailed paths

  • Introduced through: js-given@0.0.11 machinepack-zip@1.1.0 archiver@0.14.4 lodash@3.2.0
  • Introduced through: js-given@0.0.11 machinepack-zip@1.1.0 archiver@0.14.4 zip-stream@0.5.2 lodash@3.2.0
  • Introduced through: js-given@0.0.11 machinepack-zip@1.1.0 lodash@3.10.1
    Remediation: Open PR to patch lodash@3.10.1.
  • Introduced through: js-given@0.0.11 machinepack-zip@1.1.0 machine@10.4.0 lodash@3.10.1
    Remediation: Open PR to patch lodash@3.10.1.
  • Introduced through: js-given@0.0.11 machinepack-zip@1.1.0 machine@10.4.0 rttc@7.4.0 lodash@3.10.1
    Remediation: Open PR to patch lodash@3.10.1.
  • Introduced through: js-given@0.0.11 machinepack-zip@1.1.0 machinepack-fs@2.3.0 lodash@2.4.2
  • Introduced through: js-given@0.0.11 machinepack-zip@1.1.0 machinepack-fs@2.3.0 machine@4.1.1 lodash@2.4.2
  • Introduced through: js-given@0.0.11 machinepack-zip@1.1.0 machinepack-fs@2.3.0 machinepack-util@0.7.24 lodash@2.4.2
  • Introduced through: js-given@0.0.11 machinepack-zip@1.1.0 machinepack-fs@2.3.0 machine@4.1.1 rttc@1.0.2 lodash@2.4.2
  • Introduced through: js-given@0.0.11 machinepack-zip@1.1.0 machinepack-fs@2.3.0 machine@4.1.1 switchback@1.1.3 lodash@2.4.2
  • Introduced through: js-given@0.0.11 machinepack-zip@1.1.0 machinepack-fs@2.3.0 machinepack-util@0.7.24 machine@2.0.6 lodash@2.4.2
  • Introduced through: js-given@0.0.11 machinepack-zip@1.1.0 machinepack-fs@2.3.0 machinepack-util@0.7.24 machine@2.0.6 rttc@1.0.2 lodash@2.4.2
  • Introduced through: js-given@0.0.11 machinepack-zip@1.1.0 machinepack-fs@2.3.0 machinepack-util@0.7.24 machine@2.0.6 switchback@1.1.3 lodash@2.4.2

Overview

lodash is a modern JavaScript utility library delivering modularity, performance, & extras.

Affected versions of this package are vulnerable to Prototype Pollution. The utilities function allow modification of the Object prototype. If an attacker can control part of the structure passed to this function, they could add or modify an existing property.

PoC by Olivier Arteau (HoLyVieR)

var _= require('lodash');
var malicious_payload = '{"__proto__":{"oops":"It works !"}}';

var a = {};
console.log("Before : " + a.oops);
_.merge({}, JSON.parse(malicious_payload));
console.log("After : " + a.oops);

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:

merge (target, source)

  foreach property of source

    if property exists and is an object on both the target and the source

      merge(target[property], source[property])

    else

      target[property] = source[property]

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.

Types of attacks

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

  1. Freeze the prototype— use Object.freeze (Object.prototype).

  2. Require schema validation of JSON input.

  3. Avoid using unsafe recursive merge functions.

  4. Consider using objects without prototypes (for example, Object.create(null)), breaking the prototype chain and preventing pollution.

  5. As a best practice use Map instead of Object.

For more information on this vulnerability type:

Arteau, Oliver. “JavaScript prototype pollution attack in NodeJS application.” GitHub, 26 May 2018

Remediation

Upgrade lodash to version 4.17.5 or higher.

References

medium severity

Regular Expression Denial of Service (ReDoS)

  • Vulnerable module: lodash
  • Introduced through: machinepack-zip@1.1.0

Detailed paths

  • Introduced through: js-given@0.0.11 machinepack-zip@1.1.0 archiver@0.14.4 lodash@3.2.0
  • Introduced through: js-given@0.0.11 machinepack-zip@1.1.0 archiver@0.14.4 zip-stream@0.5.2 lodash@3.2.0
  • Introduced through: js-given@0.0.11 machinepack-zip@1.1.0 lodash@3.10.1
  • Introduced through: js-given@0.0.11 machinepack-zip@1.1.0 machine@10.4.0 lodash@3.10.1
  • Introduced through: js-given@0.0.11 machinepack-zip@1.1.0 machine@10.4.0 rttc@7.4.0 lodash@3.10.1
  • Introduced through: js-given@0.0.11 machinepack-zip@1.1.0 machinepack-fs@2.3.0 lodash@2.4.2
  • Introduced through: js-given@0.0.11 machinepack-zip@1.1.0 machinepack-fs@2.3.0 machine@4.1.1 lodash@2.4.2
  • Introduced through: js-given@0.0.11 machinepack-zip@1.1.0 machinepack-fs@2.3.0 machinepack-util@0.7.24 lodash@2.4.2
  • Introduced through: js-given@0.0.11 machinepack-zip@1.1.0 machinepack-fs@2.3.0 machine@4.1.1 rttc@1.0.2 lodash@2.4.2
  • Introduced through: js-given@0.0.11 machinepack-zip@1.1.0 machinepack-fs@2.3.0 machine@4.1.1 switchback@1.1.3 lodash@2.4.2
  • Introduced through: js-given@0.0.11 machinepack-zip@1.1.0 machinepack-fs@2.3.0 machinepack-util@0.7.24 machine@2.0.6 lodash@2.4.2
  • Introduced through: js-given@0.0.11 machinepack-zip@1.1.0 machinepack-fs@2.3.0 machinepack-util@0.7.24 machine@2.0.6 rttc@1.0.2 lodash@2.4.2
  • Introduced through: js-given@0.0.11 machinepack-zip@1.1.0 machinepack-fs@2.3.0 machinepack-util@0.7.24 machine@2.0.6 switchback@1.1.3 lodash@2.4.2

Overview

lodash is a modern JavaScript utility library delivering modularity, performance, & extras.

Affected versions of this package are vulnerable to Regular Expression Denial of Service (ReDoS). It parses dates using regex strings, which may cause a slowdown of 2 seconds per 50k characters.

Details

Denial of Service (DoS) describes a family of attacks, all aimed at making a system inaccessible to its original and legitimate users. There are many types of DoS attacks, ranging from trying to clog the network pipes to the system by generating a large volume of traffic from many machines (a Distributed Denial of Service - DDoS - attack) to sending crafted requests that cause a system to crash or take a disproportional amount of time to process.

The Regular expression Denial of Service (ReDoS) is a type of Denial of Service attack. Regular expressions are incredibly powerful, but they aren't very intuitive and can ultimately end up making it easy for attackers to take your site down.

Let’s take the following regular expression as an example:

regex = /A(B|C+)+D/

This regular expression accomplishes the following:

  • A The string must start with the letter 'A'
  • (B|C+)+ The string must then follow the letter A with either the letter 'B' or some number of occurrences of the letter 'C' (the + matches one or more times). The + at the end of this section states that we can look for one or more matches of this section.
  • D Finally, we ensure this section of the string ends with a 'D'

The expression would match inputs such as ABBD, ABCCCCD, ABCBCCCD and ACCCCCD

It most cases, it doesn't take very long for a regex engine to find a match:

$ time node -e '/A(B|C+)+D/.test("ACCCCCCCCCCCCCCCCCCCCCCCCCCCCD")'
0.04s user 0.01s system 95% cpu 0.052 total

$ time node -e '/A(B|C+)+D/.test("ACCCCCCCCCCCCCCCCCCCCCCCCCCCCX")'
1.79s user 0.02s system 99% cpu 1.812 total

The entire process of testing it against a 30 characters long string takes around ~52ms. But when given an invalid string, it takes nearly two seconds to complete the test, over ten times as long as it took to test a valid string. The dramatic difference is due to the way regular expressions get evaluated.

Most Regex engines will work very similarly (with minor differences). The engine will match the first possible way to accept the current character and proceed to the next one. If it then fails to match the next one, it will backtrack and see if there was another way to digest the previous character. If it goes too far down the rabbit hole only to find out the string doesn’t match in the end, and if many characters have multiple valid regex paths, the number of backtracking steps can become very large, resulting in what is known as catastrophic backtracking.

Let's look at how our expression runs into this problem, using a shorter string: "ACCCX". While it seems fairly straightforward, there are still four different ways that the engine could match those three C's:

  1. CCC
  2. CC+C
  3. C+CC
  4. C+C+C.

The engine has to try each of those combinations to see if any of them potentially match against the expression. When you combine that with the other steps the engine must take, we can use RegEx 101 debugger to see the engine has to take a total of 38 steps before it can determine the string doesn't match.

From there, the number of steps the engine must use to validate a string just continues to grow.

String Number of C's Number of steps
ACCCX 3 38
ACCCCX 4 71
ACCCCCX 5 136
ACCCCCCCCCCCCCCX 14 65,553

By the time the string includes 14 C's, the engine has to take over 65,000 steps just to see if the string is valid. These extreme situations can cause them to work very slowly (exponentially related to input size, as shown above), allowing an attacker to exploit this and can cause the service to excessively consume CPU, resulting in a Denial of Service.

Remediation

Upgrade lodash to version 4.17.11 or higher.

References