![]() Gaining initial access via the exploit followed by cryptojacking (malicious crypto mining without the knowledge and consent from the owner), seems to be the primary motivation for threat actors at this early stage of exploitation. Since December 10th, Bitdefender observed various attacks on our honeypots, but we also detected real-world attacks on machines running the Bitdefender endpoint protection agent. Source: Bitdefender telemetry ( to ) How are attackers exploiting the vulnerability? JNDI protocols used in real-life attacks. There are other protocols attackers may use to cause Log4j to save log information in a specific format. ![]() It is important to understand that LDAP and user agent string are just examples of potential exploitation. The latest version (2.16, at the moment of writing) is not affected as it was released after the first PoC shown to exploit the Log4j vulnerability was published. Specially crafted user-agent string to trigger this vulnerabilityĪll versions of Log4j from 2.0-beta9 (released in September 2013) to 2.14.1 (March 2021) are affected. However, there is often processing done before the string is saved to a log file – for example expansion of variables (defined as $" We think of logging libraries as passive since they typically just write down messages to the log file or a database. For Bitdefender customers, we recommend reading this security advisory released on December 11 th 2021. ![]() We expect to see more application-specific exploits soon and the situation is still very dynamic. What we can say already is that mitigation will be a marathon, not a sprint. BITDEFENDER LINUX SOFTWAREJava powers web cams, car navigation systems, DVD players and set-top boxes, various terminals, and even parking meters and medical devices.Īs a result, this vulnerability has a very significant ripple effect on the software supply chain, and it is hard to predict the total scope and long-term impact of the vulnerability. All applications using the framework running on operating systems such as Windows, Linux, macOS and FreeBSD are vulnerable. Java is a cross-platform framework, and this vulnerability is not limited to applications running on specific operating system. The Log4j library is widely used by other frameworks, such as Elasticsearch, Kafka and Flink, that are foundational for many popular web sites and services. ![]() The original release of the Java Development Kit (JDK) did not include logging APIs, so Java logging libraries quickly gained popularity including Log4j. Log4j is an open source library, part of the Apache Logging Services, written in Java. The source of the vulnerability is Log4j, a logging library commonly used by a wide range of applications, and specifically versions up to 2.14.1 (Note: this vulnerability is also known as Log4Shell). BITDEFENDER LINUX CODEOn December 9, 2021, Apache disclosed CVE-2021-44228, a remote code execution vulnerability – assigned with a severity of 10 (the highest possible risk score). ![]()
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