What is Log4j vulnerability in simple words
The Log4j 2 library controls how applications log strings of code and information. The vulnerability enables an attacker to gain control over a string and trick the application into requesting and executing malicious code under the attacker's control.
What is the fix for Log4j vulnerability
You can fix the Log4j vulnerability by updating Log4j to the latest version (2.15. 0 or later for CVE-2021-44228 and 2.16. 0 or later for CVE-2021-45046) and applying temporary workarounds if immediate updating is not feasible.
What is Log4j or log4j2 vulnerability
Background: The Apache Log4j 2 utility is a commonly used component for logging requests. On December 9, 2021, a vulnerability was reported that could allow a system running Apache Log4j 2 version 2.15 or below to be compromised and allow an attacker to execute arbitrary code.
What is the description of Log4j
Log4j is an open source project based on the work of many authors. It allows the developer to control which log statements are output with arbitrary granularity. It is fully configurable at runtime using external configuration files. Best of all, log4j has a gentle learning curve.
How do I know if I am vulnerable to Log4j
We also use a log inspection rule to detect the vulnerability. The log inspection rule 1011241 – Apache Log4j Remote Code Execution Vulnerability (CVE-2021-44228) looks for JNDI payloads in the access logs, with the default path being /var/log/*/access. log.
What did Log4j affect
The Log4j exploit, also known as the Log4Shell vulnerability, allows threat actors to take control of web-facing servers by feeding them a malicious text string.
How serious is the Log4j issue
Although this is a secure functionality, the Log4j flaw allows an attacker to input their own JNDI lookups, where they then direct the server to their fake LDAP server. From here, the attacker now has control of the remote system and can execute malware, exfiltrate sensitive information like passwords, and more.
What is the root cause of Log4j vulnerability
The RCE flaw is due to the way Log4j interacts with JNDI without properly validating all requests. This means an attacker who gains access to logging messages could inject fraudulent messages that enable arbitrary code execution and exploitation of a vulnerable system.
Does Log4j vulnerability only affect Java
The vulnerability affects not only Java-based applications and services that use the library directly, but also many other popular Java components and development frameworks that rely on it.
Is Log4j a threat
A critical security flaw in the Log4j framework is allowing cybercriminals to compromise vulnerable systems with just a single malicious code injection. The vulnerability is associated with the user activity logger known as Log4J – a logging library freely distributed by the Apache Software Foundation.
What is Log4j & why we use it
Log4j is used by developers to keep track of what happens in their software applications or online services. It's basically a huge journal of the activity of a system or application. This activity is called 'logging' and it's used by developers to keep an eye out for problems for users.
What is the root cause of Log4j
The Log4j exploit began as a single vulnerability, but it became a series of issues involving Log4j and the Java Naming and Directory Interface (JNDI) interface, which is the root cause of the exploit.
How does log4j affect me
Although this is a secure functionality, the Log4j flaw allows an attacker to input their own JNDI lookups, where they then direct the server to their fake LDAP server. From here, the attacker now has control of the remote system and can execute malware, exfiltrate sensitive information like passwords, and more.
Who has been affected by log4j
List of vendors and software affected by the Apache Log4J vulnerability (CVE-2021-44228)
| # | Vendor | Software |
|---|---|---|
| 4 | Amazon Web Services | Amazon Linux AMI |
| 5 | Apache Foundation | Apache Spark |
| 6 | Apache Foundation | Apache Tapestry |
| 7 | Apache Foundation | Apache Nifi |
What devices are affected by Log4j vulnerability
According to ZDNet, “Any device that's exposed to the internet is at risk if it's running Apache Log4J, versions 2.0 to 2.14. 1." This affects both IT and Operational Technology (OT) networks.
Who has been hacked by Log4j
Over a hundred vendors confirmed to be affected including: Microsoft, Amazon Web Services, Netflix and Oracle, and experts say that the flaw has gone unnoticed since 2013.
Why is Log4j on my computer
Log4j is used by developers to keep track of what happens in their software applications or online services. It's basically a huge journal of the activity of a system or application. This activity is called 'logging' and it's used by developers to keep an eye out for problems for users.
What platforms are affected by Log4j
List of vendors and software affected by the Apache Log4J vulnerability (CVE-2021-44228)
| # | Vendor | Software |
|---|---|---|
| 24 | Apache Foundation | Apache EventMesh |
| 25 | Apereo Foundation | Opencast |
| 26 | Apereo Foundation | Apereo CAS |
| 27 | Apple Inc. | Apple Xcode |
What software is affected by Log4j vulnerability
Broadcom's CA Advanced Authentication, Symantec SiteMinder unified access management, and VIP Authentication Hub products are all affected by the Log4j vulnerability disclosed on Monday. Symantec Endpoint Protection Manager, the company's endpoint protection product, may also be affected.
Where is Log4j commonly used
Log4j is typically deployed as a software library within an application or Java service. As such, not every user or organization may be aware they are using Log4j as an embedded component.
Does Log4j only affect Java
The vulnerability affects not only Java-based applications and services that use the library directly, but also many other popular Java components and development frameworks that rely on it.
How can I tell if I’m using Log4j
Navigate into the "META-INF" sub-directory and open the file "MANIFEST. MF" in a text editor. Find the line starting with "Implementation-Version", this is the Log4j version.
What products use Log4j
Any systems and services that use the Java logging library, Apache Log4j between versions 2.0 and 2.15. This includes Atlassian, Amazon, Microsoft Azure, Cisco, Commvault, ESRI, Exact, Fortinet, JetBrains, Nelson, Nutanix, OpenMRS, Oracle, Red Hat, Splunk, Soft, and VMware.
Are banks affected by Log4j
In an article on americanbanker.com(2) Steve Rubinow a faculty member in computer science at DePaul University and former chief information officer of NYSE Euronext and Thomson Reuters states that “Any Bank or Fintech that uses Java applications is susceptible to the Log4j vulnerability since Log4j is a tool companies …
Which company affected by Log4j
Top 10 Impacted VendorsAdobe. Adobe found that ColdFusion 2021 is subject to Log4Shell and released a security updateOpens a new window to address the problem on December 14.Cisco.F-Secure.Fortinet.FortiGuard.IBM.Okta.VMware.
