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Apache Log4j 2 is the successor of Log4j 1 which was released as GA version in July 2015. The framework was rewritten from scratch and has been inspired by existing logging solutions, including Log4j 1 and java.util.logging.
Log4Shell (CVE-2021-44228) is a zero-day vulnerability reported in November 2021 in Log4j, a popular Java logging framework, involving arbitrary code execution. [2] [3] The vulnerability had existed unnoticed since 2013 and was privately disclosed to the Apache Software Foundation, of which Log4j is a project, by Chen Zhaojun of Alibaba Cloud's security team on 24 November 2021.
Log4j 2 provides both an API and an implementation. The API can be routed to other logging implementations equivalent to how SLF4J works. Unlike SLF4J, the Log4j 2 API logs Message [2] objects instead of Strings for extra flexibility and also supports Java Lambda expressions. [3] JCL isn't really a logging framework, but a wrapper for one.
Simple Logging Facade for Java (SLF4J) provides a Java logging API by means of a simple facade pattern.The underlying logging backend is determined at runtime by adding the desired binding to the classpath and may be the standard Sun Java logging package java.util.logging, [2] Log4j, Reload4j, Logback [3] or tinylog.
Apache log4j 1.3 added many interesting features, but was compatibility with log4j 1.2 was problematic. Many features original developed for log4j 1.3 have been back-ported as companions for log4j 1.2. No further development is anticipated. Apache log4j 2.0 is an experimental development branch for logging services designed for Java 5 and later.
In February 2022, Walden was appointed as an inaugural member of the Cyber Safety Review Board, [2] [3] and she contributed to its review of the December 2021 Log4j event. [4] [5] Walden later served as assistant general counsel of the Digital Crimes Unit (DCU) at Microsoft. [6] [7] [8] [9]
default Log4j socketappender port 4567: Unofficial: Sinatra default server port in development mode (HTTP) 4569: Yes: Inter-Asterisk eXchange (IAX2) 4604: Yes: Identity Registration Protocol: 4605: Yes: Direct End to End Secure Chat Protocol: 4610–4640: Unofficial: QualiSystems TestShell Suite Services 4662 Yes: OrbitNet Message Service ...
The danger of Log4j. The Log4j vulnerability is dangerous for two reasons: how widely used the software is, and how attackers can take advantage of the flaw.