Wed. Jan 26th, 2022

In case you’re not sure whether or not your Java undertaking is free from Log4j vulnerabilities, you must do this easy-to-use scanning device instantly.

open source security

Picture: Shutterstock/LeoWolfert

One wonderful thing about Linux and the open supply group is that as quickly as a vulnerability is detected, builders are onerous at work releasing instruments to mitigate the issue. Such is the case with the Log4j vulnerability.

This explicit difficulty is kind of unhealthy, because it impacts so many servers and tasks. Here is how the Log4j vulnerability works: 

  • Log4j2 helps a logging characteristic known as Message Lookup Substitution, which permits particular strings to get replaced, through the time of logging, by different dynamically generated strings.
  • One of many lookup strategies (JNDI paired with LDAP) fetches a particular class from a distant supply to deserialize it, which executes a number of the class code.
  • Any a part of the logged string can then be managed by a distant attacker.

A part of the issue is that Log4j is so deeply embedded in Java tasks and dependencies which can be utilized by various instruments. So discovering each vulnerability in your server may be difficult.

Fortuitously, loads of efforts have been taken to assist find these points. One such effort is Log4j Detect, which is able to scan your growth tasks to make sure they’re free from vulnerabilities. 

I need to present you learn how to use the Log4j Detect script to scan your Java tasks. 

What you may want

To work with this script, you may want a Java undertaking and a consumer with sudo privileges. That is it. Let’s get to work. This script can be utilized on Linux, macOS and Home windows. I will be demonstrating on Linux (by way of Ubuntu Server 20.04). 

SEE: Log4j: The way to shield your self from this safety vulnerability (TechRepublic)

The way to obtain and set up Log4j Detect

The very first thing to be finished is the set up of Log4j Detect. To do this, log into your Linux server and obtain the script by first setting your system structure as an setting variable with:


In case your structure is ARM, that command could be:


Subsequent, obtain the script with:

wget "$ARCH.tar.gz"

Unpack the file with:

tar -xzvf log4j-detect-1.3.0-darwin-$ARCH.tar.gz

Give the file the right permissions with:

chmod +x log4j-detect

Transfer the file into /usr/native/bin with:

sudo mv log4j-detect /usr/native/bin/

SEE: Password breach: Why popular culture and passwords do not combine (free PDF) (TechRepublic)

The way to scan your undertaking with Log4j-detect

Now that the set up is full, let’s scan a undertaking for Log4j vulnerabilities. For instance your undertaking is housed in a listing named JAVAWeb-Undertaking. Become that listing and difficulty the command:

log4j-detect scan

Relying on how massive your undertaking is, the scan should not take too lengthy to finish. When it does, it will report again if there are any points (Determine A).

Determine A


The outcomes of a Log4j-detect scan on a random Java undertaking I discovered on GitHub

As you may see, the Java undertaking I examined has Log4j points that should be addressed. The script will level out the issues in addition to learn how to remediate the problem. As soon as you have addressed every little thing, run the script once more to see if the vulnerabilities are now not detected.

You need to contemplate this a must-do for each undertaking and server you watched might be susceptible to Log4j (and even these you would possibly assume are protected). That is one case the place you’re most actually higher protected than sorry.

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