Vulnerabilities

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 GitHub

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 d95c18e1

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high severity

Prototype Poisoning

  • Vulnerable module: qs
  • Introduced through: express@4.17.1

Detailed paths

  • Introduced through: @fbl-plugins/html-to-img@FireBlinkLTD/fbl-plugins-html-to-img#d95c18e1b8ab043624216c8fef51c0d71064f8d7 › express@4.17.1 › qs@6.7.0
    Remediation: Upgrade to express@4.17.3.
  • Introduced through: @fbl-plugins/html-to-img@FireBlinkLTD/fbl-plugins-html-to-img#d95c18e1b8ab043624216c8fef51c0d71064f8d7 › express@4.17.1 › body-parser@1.19.0 › qs@6.7.0
    Remediation: Upgrade to express@4.17.3.

Overview

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Poisoning which allows attackers to cause a Node process to hang, processing an Array object whose prototype has been replaced by one with an excessive length value.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.

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 qs to version 6.2.4, 6.3.3, 6.4.1, 6.5.3, 6.6.1, 6.7.3, 6.8.3, 6.9.7, 6.10.3 or higher.

References

Prototype Poisoning vulnerability report

medium severity

Information Exposure

  • Vulnerable module: node-fetch
  • Introduced through: puppeteer@10.0.0

Detailed paths

  • Introduced through: @fbl-plugins/html-to-img@FireBlinkLTD/fbl-plugins-html-to-img#d95c18e1b8ab043624216c8fef51c0d71064f8d7 › puppeteer@10.0.0 › node-fetch@2.6.1
    Remediation: Upgrade to puppeteer@13.1.2.

Overview

node-fetch is a light-weight module that brings window.fetch to node.js

Affected versions of this package are vulnerable to Information Exposure when fetching a remote url with Cookie, if it get a Location response header, it will follow that url and try to fetch that url with provided cookie. This can lead to forwarding secure headers to 3th party.

Remediation

Upgrade node-fetch to version 2.6.7, 3.1.1 or higher.

References

Information Exposure vulnerability report

medium severity

Missing Release of Resource after Effective Lifetime

  • Vulnerable module: inflight
  • Introduced through: puppeteer@10.0.0

Detailed paths

  • Introduced through: @fbl-plugins/html-to-img@FireBlinkLTD/fbl-plugins-html-to-img#d95c18e1b8ab043624216c8fef51c0d71064f8d7 › puppeteer@10.0.0 › rimraf@3.0.2 › glob@7.2.3 › inflight@1.0.6

Overview

Affected versions of this package are vulnerable to Missing Release of Resource after Effective Lifetime via the makeres function due to improperly deleting keys from the reqs object after execution of callbacks. This behavior causes the keys to remain in the reqs object, which leads to resource exhaustion.

Exploiting this vulnerability results in crashing the node process or in the application crash.

Note: This library is not maintained, and currently, there is no fix for this issue. To overcome this vulnerability, several dependent packages have eliminated the use of this library.

To trigger the memory leak, an attacker would need to have the ability to execute or influence the asynchronous operations that use the inflight module within the application. This typically requires access to the internal workings of the server or application, which is not commonly exposed to remote users. Therefore, “Attack vector” is marked as “Local”.

PoC

const inflight = require('inflight');

function testInflight() {
  let i = 0;
  function scheduleNext() {
    let key = `key-${i++}`;
    const callback = () => {
    };
    for (let j = 0; j < 1000000; j++) {
      inflight(key, callback);
    }

    setImmediate(scheduleNext);
  }


  if (i % 100 === 0) {
    console.log(process.memoryUsage());
  }

  scheduleNext();
}

testInflight();

Remediation

There is no fixed version for inflight.

References

Missing Release of Resource after Effective Lifetime vulnerability report

medium severity

Open Redirect

  • Vulnerable module: express
  • Introduced through: express@4.17.1

Detailed paths

  • Introduced through: @fbl-plugins/html-to-img@FireBlinkLTD/fbl-plugins-html-to-img#d95c18e1b8ab043624216c8fef51c0d71064f8d7 › express@4.17.1
    Remediation: Upgrade to express@4.19.2.

Overview

express is a minimalist web framework.

Affected versions of this package are vulnerable to Open Redirect due to the implementation of URL encoding using encodeurl before passing it to the location header. This can lead to unexpected evaluations of malformed URLs by common redirect allow list implementations in applications, allowing an attacker to bypass a properly implemented allow list and redirect users to malicious sites.

Remediation

Upgrade express to version 4.19.2, 5.0.0-beta.3 or higher.

References

Open Redirect vulnerability report