snyk-demo-app

A demo application for Snyk.

Known vulnerabilities18
Vulnerable paths20
Dependencies274

Arbitrary Code Injection

high severity
  • Vulnerable module: pouchdb
  • Introduced through: falcor-router-demo@1.0.3

Detailed paths

  • Introduced through: snyk-demo-app@snyk/snyk-demo-app#2f31650f3fbdfac424cb54708a66550e7a8e4e0d falcor-router-demo@1.0.3 pouchdb@3.6.0

Overview

pouchDB is an open-source JavaScript database inspired by Apache CouchDB that is designed to run well within the browser.

Vulnerable versions of the package had the evalView function in pouchdb-core to execute the view function without a sandbox. The fix was introduced in version 6.0.5, executing the view function in a sandbox and enforcing strict mode when running in Node.js.

The vulnerability was reported by micaksica.

Remediation

Upgrade pouchDB to version 6.0.5 or later.

References

Arbitrary JavaScript Code Injection

high severity
  • Vulnerable module: bassmaster
  • Introduced through: bassmaster@1.5.1

Detailed paths

  • Introduced through: snyk-demo-app@snyk/snyk-demo-app#2f31650f3fbdfac424cb54708a66550e7a8e4e0d bassmaster@1.5.1

Overview

Old versions of bassmaster, a Hapi server plugin used to process batches of requests, use the eval method as part of its processing and validation of user input.

An attacker can therefore provide arbitrary javascript in this input, which will be executed by this eval function without limitation.

This is a very severe remote JavaScript code execution, and depending on the node process permissions can turn into Arbitrary Remote Code Execution on the operating system level as well.

Remediation

Update to bassmaster version 1.5.2 or greater.

References

Content Injection (XSS)

high severity
  • Vulnerable module: handlebars
  • Introduced through: snyk-demo-child@0.0.1

Detailed paths

  • Introduced through: snyk-demo-app@snyk/snyk-demo-app#2f31650f3fbdfac424cb54708a66550e7a8e4e0d snyk-demo-child@0.0.1 handlebars@3.0.3

Overview

When using attributes without quotes in a handlebars template, an attacker can manipulate the input to introduce additional attributes, potentially executing code. This may lead to a Cross-Site Scripting (XSS) vulnerability, assuming an attacker can influence the value entered into the template. If the handlebars template is used to render user-generated content, this vulnerability may escalate to a persistent XSS vulnerability.

Details

Example:

Assume handlebars was used to display user comments and avatar, using the following template: <img src={{avatarUrl}}><pre>{{comment}}</pre>

If an attacker spoofed their avatar URL and provided the following value: http://evil.org/avatar.png onload=alert(document.cookie)

The resulting HTML would be the following, triggering the script once the image loads: <img src=http://evil.org/avatar.png onload=alert(document.cookie)><pre>Gotcha!</pre>

References

ReDoS via long string of semicolons

high severity
  • Vulnerable module: tough-cookie
  • Introduced through: falcor-router-demo@1.0.3

Detailed paths

  • Introduced through: snyk-demo-app@snyk/snyk-demo-app#2f31650f3fbdfac424cb54708a66550e7a8e4e0d falcor-router-demo@1.0.3 pouchdb@3.6.0 request@2.28.0 tough-cookie@0.9.15

Overview

tough-cookie package versions 0.9.7 through 2.2.2 are vulnerable to a Regular expression Denial of Service (ReDoS) when long strings of semicolons in the Set-Cookie header, causes the event loop to block for excessive amounts of time.

"The Regular expression Denial of Service (ReDoS) is a Denial of Service attack, that exploits the fact that most Regular Expression implementations may reach extreme situations that cause them to work very slowly (exponentially related to input size). An attacker can then cause a program using a Regular Expression to enter these extreme situations and then hang for a very long time." 1

Remediation

Upgrade tough-cookie to at version 2.3.0 or greater.

References

Cross-site Scripting (XSS)

medium severity
  • Vulnerable module: validator
  • Introduced through: azure-mgmt-storage@0.9.16

Detailed paths

  • Introduced through: snyk-demo-app@snyk/snyk-demo-app#2f31650f3fbdfac424cb54708a66550e7a8e4e0d azure-mgmt-storage@0.9.16 azure-common@0.9.11 validator@3.1.0

Overview

validator is String validation and sanitization. Affected versions of the package are vulnerable to Cross-site Scripting (XSS) in IE9 due to unescaped backticks.

Remediation

Upgrade validator to version 3.35.0 or higher.

References

Denial of Service (Event Loop Blocking)

medium severity
  • Vulnerable module: qs
  • Introduced through: falcor-router-demo@1.0.3

Detailed paths

  • Introduced through: snyk-demo-app@snyk/snyk-demo-app#2f31650f3fbdfac424cb54708a66550e7a8e4e0d falcor-router-demo@1.0.3 pouchdb@3.6.0 request@2.28.0 qs@0.6.6

Overview

When parsing a string representing a deeply nested object, qs will block the event loop for long periods of time. Such a delay may hold up the server's resources, keeping it from processing other requests in the meantime, thus enabling a Denial-of-Service attack.

Remediation

Update qs to version 1.0.0 or greater. In these versions, qs enforces a max object depth (along with other limits), limiting the event loop length and thus preventing such an attack.

References

https://nodesecurity.io/advisories/28

Denial of Service (Memory Exhaustion)

medium severity
  • Vulnerable module: qs
  • Introduced through: falcor-router-demo@1.0.3

Detailed paths

  • Introduced through: snyk-demo-app@snyk/snyk-demo-app#2f31650f3fbdfac424cb54708a66550e7a8e4e0d falcor-router-demo@1.0.3 pouchdb@3.6.0 request@2.28.0 qs@0.6.6

Overview

During parsing, the qs module may create a sparse area (an array where not elements are filled), and grow that array to the necessary size based on the indices used on it. An attacker can specify a high index value in a query string, thus making the server allocate a respectively big array. Truly large values can cause the server to run out of memory and cause it to crash - thus enabling a Denial-of-Service attack.

Remediation

Upgrade qs to version 1.0.0 or greater. In these versions, qs introduced a low limit on the index value, preventing such an attack

References

Improper input validation

medium severity
  • Vulnerable module: call
  • Introduced through: hapi@10.5.0

Detailed paths

  • Introduced through: snyk-demo-app@snyk/snyk-demo-app#2f31650f3fbdfac424cb54708a66550e7a8e4e0d hapi@10.5.0 call@2.0.2

Overview

call is the primary HTTP router of the hapi framework.

The vulnerability arise from undefined values inside a path (last segment being an exception) making their way into components that do not care for values being undefined (eg. the database layer).

For example, the request URI /delete/company// may incorrectly match a route looking for /delete/company/{company}/. By itself, the bad match is not a vulnerability. However, depending on the remaining logic in the application, such a bad match may result in skipping a protection mechanisms. In the above example, if the route translates to a DB delete command, it might delete all the companies from the db.

Remediation

Upgrade to version 3.0.2 or higher.

References

https://github.com/hapijs/hapi/issues/3228 https://github.com/hapijs/call/commit/9570eee5358b4383715cc6a13cb95971678efd30

Improper minification of non-boolean comparisons

medium severity
  • Vulnerable module: uglify-js
  • Introduced through: snyk-demo-child@0.0.1

Detailed paths

  • Introduced through: snyk-demo-app@snyk/snyk-demo-app#2f31650f3fbdfac424cb54708a66550e7a8e4e0d snyk-demo-child@0.0.1 handlebars@3.0.3 uglify-js@2.3.6

Overview

Tom MacWright discovered that UglifyJS versions 2.4.23 and earlier are affected by a vulnerability which allows a specially crafted Javascript file to have altered functionality after minification. This bug was demonstrated by Yan to allow potentially malicious code to be hidden within secure code, activated by minification.

Source: Node Security Project

Details

In Boolean algebra, DeMorgan's laws describe the relationships between conjunctions ( && ), disjunctions ( || ) and negations ( ! ). In Javascript form, they state that: !(a && b) === (!a) || (!b) !(a || b) === (!a) && (!b)

The law does not hold true when one of the values is not a boolean however.

Vulnerable versions of UglifyJS do not account for this restriction, and erroneously apply the laws to a statement if it can be reduced in length by it.

Consider this authentication function:

function isTokenValid(user) {
                var timeLeft =
                    !!config && // config object exists
                    !!user.token && // user object has a token
                    !user.token.invalidated && // token is not explicitly invalidated
                    !config.uninitialized && // config is initialized
                    !config.ignoreTimestamps && // don't ignore timestamps
                    getTimeLeft(user.token.expiry); // > 0 if expiration is in the future
            
                // The token must not be expired
                return timeLeft > 0;
            }
            
            function getTimeLeft(expiry) {
              return expiry - getSystemTime();
            }
            

When minified with a vulnerable version of UglifyJS, it will produce the following insecure output, where a token will never expire:

( Formatted for readability )

function isTokenValid(user) {
                var timeLeft = !(                       // negation
                    !config                             // config object does not exist
                    || !user.token                      // user object does not have a token
                    || user.token.invalidated           // token is explicitly invalidated
                    || config.uninitialized             // config isn't initialized
                    || config.ignoreTimestamps          // ignore timestamps
                    || !getTimeLeft(user.token.expiry)  // > 0 if expiration is in the future
                );
                return timeLeft > 0
            }
            
            function getTimeLeft(expiry) {
                return expiry - getSystemTime()
            }
            

Remediation

Upgrade UglifyJS to version >= 2.4.24.

References

Regular Expression Denial of Service

medium severity
  • Vulnerable module: validator
  • Introduced through: azure-mgmt-storage@0.9.16

Detailed paths

  • Introduced through: snyk-demo-app@snyk/snyk-demo-app#2f31650f3fbdfac424cb54708a66550e7a8e4e0d azure-mgmt-storage@0.9.16 azure-common@0.9.11 validator@3.1.0

Overview

The validator module, versions < 3.22.1 are vulnerable to Regular Expression Denial of Service (ReDoS).

Source: Node Security Project

Remediation

Update to version 3.22.1 or greater.

References

Remote Memory Exposure

medium severity
  • Vulnerable module: request
  • Introduced through: azure-mgmt-storage@0.9.16 and falcor-router-demo@1.0.3

Detailed paths

  • Introduced through: snyk-demo-app@snyk/snyk-demo-app#2f31650f3fbdfac424cb54708a66550e7a8e4e0d azure-mgmt-storage@0.9.16 azure-common@0.9.11 request@2.45.0
  • Introduced through: snyk-demo-app@snyk/snyk-demo-app#2f31650f3fbdfac424cb54708a66550e7a8e4e0d falcor-router-demo@1.0.3 pouchdb@3.6.0 request@2.28.0

Overview

request is a simplified http request client. A potential remote memory exposure vulnerability exists in request. If a request uses a multipart attachment and the body type option is number with value X, then X bytes of uninitialized memory will be sent in the body of the request.

Note that while the impact of this vulnerability is high (memory exposure), exploiting it is likely difficult, as the attacker needs to somehow control the body type of the request. One potential exploit scenario is when a request is composed based on JSON input, including the body type, allowing a malicious JSON to trigger the memory leak.

Details

Constructing a Buffer class with integer N creates a Buffer of length N with non zero-ed out memory. Example:

var x = new Buffer(100); // uninitialized Buffer of length 100
            // vs
            var x = new Buffer('100'); // initialized Buffer with value of '100'
            

Initializing a multipart body in such manner will cause uninitialized memory to be sent in the body of the request.

Proof of concept

var http = require('http')
            var request = require('request')
            
            http.createServer(function (req, res) {
              var data = ''
              req.setEncoding('utf8')
              req.on('data', function (chunk) {
                console.log('data')
                data += chunk
              })
              req.on('end', function () {
                // this will print uninitialized memory from the client
                console.log('Client sent:\n', data)
              })
              res.end()
            }).listen(8000)
            
            request({
              method: 'POST',
              uri: 'http://localhost:8000',
              multipart: [{ body: 1000 }]
            },
            function (err, res, body) {
              if (err) return console.error('upload failed:', err)
              console.log('sent')
            })
            

Remediation

Upgrade request to version 2.68.0 or higher.

If a direct dependency update is not possible, use snyk wizard to patch this vulnerability.

References

Uninitialized Memory Exposure

medium severity
  • Vulnerable module: bl
  • Introduced through: falcor-router-demo@1.0.3

Detailed paths

  • Introduced through: snyk-demo-app@snyk/snyk-demo-app#2f31650f3fbdfac424cb54708a66550e7a8e4e0d falcor-router-demo@1.0.3 pouchdb@3.6.0 levelup@0.18.6 bl@0.8.2

Overview

bl is a storage object for collections of Node Buffers.

A possible memory disclosure vulnerability exists when a value of type number is provided to the append() method and results in concatination of uninitialized memory to the buffer collection.

This is a result of unobstructed use of the Buffer constructor, who's insecure default constructor increases the odds of memory leakage.

Details

Constructing a Buffer class with integer N creates a Buffer of length N with raw (not "zero-ed") memory.

In the following example, the first call would allocate 100 bytes of memory, while the second example will allocate the memory needed for the string "100":

// uninitialized Buffer of length 100
            x = new Buffer(100); 
            // initialized Buffer with value of '100'
            x = new Buffer('100');
            

bl's append function uses the default Buffer constructor as-is, making it easy to append uninitialized memory to an existing list. If the value of the buffer list is exposed to users, it may expose raw server side memory, potentially holding secrets, private data and code. This is a similar vulnerability to the infamous Heartbleed flaw in OpenSSL.

const BufferList = require('bl')
            
            var bl = new BufferList()
            bl.append(new Buffer('abcd'))
            bl.append(new Buffer('efg'))
            bl.append('100')
            // appends a Buffer holding 100 bytes of uninitialized memory
            bl.append(100)                     
            bl.append(new Buffer('j'))
            

You can read more about the insecure Buffer behavior on our blog.

Similar vulnerabilities were discovered in request, mongoose, ws and sequelize.

References

semver Regular Expression Denial of Service

medium severity
  • Vulnerable module: semver
  • Introduced through: falcor-router-demo@1.0.3

Detailed paths

  • Introduced through: snyk-demo-app@snyk/snyk-demo-app#2f31650f3fbdfac424cb54708a66550e7a8e4e0d falcor-router-demo@1.0.3 pouchdb@3.6.0 levelup@0.18.6 semver@2.3.2

Overview

The semver module uses regular expressions when parsing a version string. For a carefully crafted input, the time it takes to process these regular expressions is not linear to the length of the input. Since the semver module did not enforce a limit on the version string length, an attacker could provide a long string that would take up a large amount of resources, potentially taking a server down. This issue therefore enables a potential Denial of Service attack. This is a slightly differnt variant of a typical Regular Expression Denial of Service (ReDoS) vulnerability.

Remediation

Update to a version 4.3.2 or greater. From the issue description [2]: "Package version can no longer be more than 256 characters long. This prevents a situation in which parsing the version number can use exponentially more time and memory to parse, leading to a potential denial of service."

References

Denial of Service through invalid If-Modified-Since/Last-Modified headers

low severity
  • Vulnerable module: hapi
  • Introduced through: hapi@10.5.0

Detailed paths

  • Introduced through: snyk-demo-app@snyk/snyk-demo-app#2f31650f3fbdfac424cb54708a66550e7a8e4e0d hapi@10.5.0

Overview

Sending a purposefully crafted invalid date in the If-Modified-Since or Last-Modified header will cause the Hapi server to err but keep the socket open (the socket will time out after 2 minutes by default). This allows an attacker to quickly exhaust the sockets on the server, making it unavailable (a Denial of Service attack).

The vulnerability is caused by the combination of two bugs. First, the underlying V8 engine throws an exception when processing the specially crafted date, instead of stating the date is invalid as it should. Second, the Hapi server does not handle the exception well, leading to the socket remaining open.

Upgrading Hapi will address the second issue and thus fix the vulnerability.

References

Incorrect handling of CORS preflight request headers

low severity
  • Vulnerable module: hapi
  • Introduced through: hapi@10.5.0

Detailed paths

  • Introduced through: snyk-demo-app@snyk/snyk-demo-app#2f31650f3fbdfac424cb54708a66550e7a8e4e0d hapi@10.5.0

Overview

Hapi v11.0.0 and below have an incorrect implementation of the CORS protocol, and allow for configurations that, at best, return inconsistent headers and, at worst, cross-origin activities that are expected to be forbidden.

Details

If the connection has CORS enabled but one route has it off, and the route is not GET, the OPTIONS prefetch request will return the default CORS headers and then the actual request will go through and return no CORS headers. This defeats the purpose of turning CORS on the route.

Remediation

Upgrade to a version 11.0.0 or greater.

References

Potentially loose security restrictions

low severity
  • Vulnerable module: hapi
  • Introduced through: hapi@10.5.0

Detailed paths

  • Introduced through: snyk-demo-app@snyk/snyk-demo-app#2f31650f3fbdfac424cb54708a66550e7a8e4e0d hapi@10.5.0

Overview

Security restrictions (e.g. origin) get overridden by less restrictive defaults (i.e. all origins) in cases when server level, connection level or route level CORS configurations are combined.

References

Regular Expression Denial of Service

low severity
  • Vulnerable module: hawk
  • Introduced through: azure-mgmt-storage@0.9.16 and falcor-router-demo@1.0.3

Detailed paths

  • Introduced through: snyk-demo-app@snyk/snyk-demo-app#2f31650f3fbdfac424cb54708a66550e7a8e4e0d azure-mgmt-storage@0.9.16 azure-common@0.9.11 request@2.45.0 hawk@1.1.1
  • Introduced through: snyk-demo-app@snyk/snyk-demo-app#2f31650f3fbdfac424cb54708a66550e7a8e4e0d falcor-router-demo@1.0.3 pouchdb@3.6.0 request@2.28.0 hawk@1.0.0

Overview

A Regular expression Denial of Service (ReDoS) vulnerability exists in hawk package, affecting version 4.1.0 and below.

"The Regular expression Denial of Service (ReDoS) is a Denial of Service attack, that exploits the fact that most Regular Expression implementations may reach extreme situations that cause them to work very slowly (exponentially related to input size). An attacker can then cause a program using a Regular Expression to enter these extreme situations and then hang for a very long time." 1

References

Regular Expression Denial of Service

low severity
  • Vulnerable module: uglify-js
  • Introduced through: snyk-demo-child@0.0.1

Detailed paths

  • Introduced through: snyk-demo-app@snyk/snyk-demo-app#2f31650f3fbdfac424cb54708a66550e7a8e4e0d snyk-demo-child@0.0.1 handlebars@3.0.3 uglify-js@2.3.6

Overview

The parse() function in the uglify-js package prior to version 2.6.0 is vulnerable to regular expression denial of service (ReDoS) attacks when long inputs of certain patterns are processed.

Details

"The Regular expression Denial of Service (ReDoS) is a Denial of Service attack, that exploits the fact that most Regular Expression implementations may reach extreme situations that cause them to work very slowly (exponentially related to input size). An attacker can then cause a program using a Regular Expression to enter these extreme situations and then hang for a very long time." 1

Remediation

Upgrade to version 2.6.0 or greater. If a direct dependency update is not possible, use snyk wizard to patch this vulnerability.

References