Vulnerabilities

 3 via 3 paths

Dependencies

 44

Source

 GitHub

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Severity
  • 2
  • 1
Status
  • 3
  • 0
  • 0

high severity
new

Allocation of Resources Without Limits or Throttling

  • Vulnerable module: ws
  • Introduced through: puppeteer@1.20.0

Detailed paths

  • Introduced through: moleculer-pdf@olivmonnier/moleculer-pdf › puppeteer@1.20.0 › ws@6.2.5
    Remediation: Upgrade to puppeteer@18.2.0.

Overview

ws is a simple to use websocket client, server and console for node.js.

Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling through the receiver.js. An attacker can cause memory exhaustion by sending incomplete fragmented WebSocket messages, specifically by transmitting a text frame with FIN=0 followed by multiple continuation frames without completing the sequence, resulting in each fragment being stored as a separate Buffer object with significant overhead.

Remediation

Upgrade ws to version 8.21.1 or higher.

References

Allocation of Resources Without Limits or Throttling vulnerability report

high severity
new

Directory Traversal

  • Vulnerable module: extract-zip
  • Introduced through: puppeteer@1.20.0

Detailed paths

  • Introduced through: moleculer-pdf@olivmonnier/moleculer-pdf › puppeteer@1.20.0 › extract-zip@1.7.0

Overview

extract-zip is an unzip a zip file into a directory using 100% javascript

Affected versions of this package are vulnerable to Directory Traversal via the extraction process. An attacker can access or modify arbitrary files by crafting a malicious zip archive containing symlinks that point outside the intended extraction directory.

Details

A Directory Traversal attack (also known as path traversal) aims to access files and directories that are stored outside the intended folder. By manipulating files with "dot-dot-slash (../)" sequences and its variations, or by using absolute file paths, it may be possible to access arbitrary files and directories stored on file system, including application source code, configuration, and other critical system files.

Directory Traversal vulnerabilities can be generally divided into two types:

  • Information Disclosure: Allows the attacker to gain information about the folder structure or read the contents of sensitive files on the system.

st is a module for serving static files on web pages, and contains a vulnerability of this type. In our example, we will serve files from the public route.

If an attacker requests the following URL from our server, it will in turn leak the sensitive private key of the root user.

curl http://localhost:8080/public/%2e%2e/%2e%2e/%2e%2e/%2e%2e/%2e%2e/root/.ssh/id_rsa

Note %2e is the URL encoded version of . (dot).

  • Writing arbitrary files: Allows the attacker to create or replace existing files. This type of vulnerability is also known as Zip-Slip.

One way to achieve this is by using a malicious zip archive that holds path traversal filenames. When each filename in the zip archive gets concatenated to the target extraction folder, without validation, the final path ends up outside 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 malicious 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

There is no fixed version for extract-zip.

References

Directory Traversal vulnerability report

medium severity

Missing Release of Resource after Effective Lifetime

  • Vulnerable module: inflight
  • Introduced through: puppeteer@1.20.0

Detailed paths

  • Introduced through: moleculer-pdf@olivmonnier/moleculer-pdf › puppeteer@1.20.0 › rimraf@2.7.1 › 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