![]() The vulnerable versions of Log4j 2 are all Log4j-core versions from 2.0-beta9 to 2.14.1. There's also script available on Github to detect the presence of the vulnerability on Linux and Windows systems. So, when we said billions of devices earlier in the post, this includes Internet-facing servers, backend systems and network components, third-party applications, services that use those applications, in cloud environments, and in industrial controls systems and SCADA systems. Backdoors and reverse shells that Microsoft has observed being deployed via the Log4j flaws include Bladabindi, HabitsRAT, Meterpreter, Cobalt Strike, and PowerShell.Īgain, Apache Log4j is a widely used open-source logging component that is present in almost every environment where a Java app is used. Many attack groups - including nation-state actors and ransomware groups-have added exploits for the vulnerabilities to their attack kits and are using them to establish reverse shells, drop remote access toolkits, and carry out hands-on-keyboard attacks on vulnerable systems. The company said its security researchers had observed a large amount of scanning activity and exploitation attempts targeting the flaws in the last weeks of December by what it assumed were threat actors searching for the vulnerability. Microsoft had immediately warned organizations about the high potential for threat actors to expand the use of the recently discovered remote code execution (RCE) vulnerabilities in the Apache Log4j logging framework to numerous types of attacks. Here is one from Trend Micro that has become fairly reliable - Why is Log4j Viewed as Such a Critical Vulnerability and Threat? In the meantime, many security organizations have developed tools to help identify the vulnerability. The real fear for most organizations is that attackers may have already gained access to their networks and will simply sit, wait, and monitor the network for an optimal time to strike. Sophos added in its blog last week “The urgency of identifying where it is used in applications and updating the software with the patch remains as critical as ever.” ![]() December 18: Log4j version 2.17.0 is released to address a vulnerability (CVE-2021-45105) that could be exploited for denial-of-service (DoS) attacks.Ī month into the battle to eliminate the vulnerability, many IT security leaders believe that attempted exploitation of the Log4Shell vulnerability will likely continue for years and will become a favorite target for penetration testers and nation-state supported threat actors.December 13: Log4j version 2.16.0 is released after the fix in version 2.15.0 was found to be incomplete and still put some systems at risk.December 11: At 14:24 CET, ESET’s Network Attack Protection module receives a detection update to cover this vulnerability.December 10: The CVE ID is published and a patch is released.December 1: The first known exploit of the vulnerability is detected in the wild. ![]() November 26: The CVE ID for the vulnerability is reserved.To help make sense of the events around this critical vulnerability, here is a basic timeline: Further, there are numerous reports that it's being massively exploited in the wild. Since this vulnerability allows remote code execution and can easily be exploited, there are already dozens of PoCs or proof of concepts for exploit kits available online for bad actors to buy and use. NIST has given this vulnerability (CVE-2021-44228) a score 10 out of 10, which is highly critical and significant as NIST rarely scores vulnerabilities a 10. To summarize how Log4j was uncovered, on December 9, 2021, a zero-day vulnerability in the popular Log4j logging framework for Java was first published. That means it's used in a vast number of things, Java is on billions of systems including IoT devices, medical kit and more. So, what is Log4j? It's an open-source logging framework in Java that developers use to track software activity in cloud and enterprise apps. What that means is Log4Shell affects Log4j or Log4j 2. The vulnerability, published as CVE-2021-44228, enables a remote attacker to take control of a device on the internet if the device is running certain versions of Log4j 2. But since the zero-day vulnerability (CVE-2021-44228) was published, Log4j has made a huge impact on the security community as researchers found that it’s vulnerable to arbitrary code execution.Īs you dig into this story, you’ll hear Log4j and Log4Shell, so to clarify up front, Log4Shell is a software vulnerability in Apache Log4j 2, a popular Java library for logging error messages in applications. Until last month, Log4j was simply a popular Java logging framework one of the numerous components that run in the background of many modern web applications. The Log4j Vulnerability is Likely to be a Significant Threat for Years
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