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<?xml version="1.0" encoding="UTF-8"?><Configurationstatus="trace"monitorInterval="60"><Properties><Propertyname="filename">target/test.log</Property></Properties><Appenders><Consolename="STDOUT"><PatternLayoutpattern="%d %p %c{1.} [%t] %m%n"/></Console><Filename="file"fileName="${filename}"><PatternLayout><pattern>%d%p%c{1.}[%t]%m%n</pattern></PatternLayout></File></Appenders><Loggers><!-- loggers whose name starts with 'org.springframework' will only log messages of level "info" or higher; if you retrieve Loggers by using the class name (e.g. Logger.getLogger(AClass.class)) and if AClass is part of the org.springframework package, it will belong to this category --><Loggername="org.springframework"level="info"additivity="false"/><!-- Filter example: for loggers whose name starts with 'com.mycompany.myproduct', log entries of level "debug" or higher whose ThreadContextMap data contains the key-value pair "test=123", also send these log entries to the "STDOUT" appender. --><Loggername="com.mycompany.myproduct"level="debug"additivity="true"><ThreadContextMapFilter><KeyValuePairkey="test"value="123"/></ThreadContextMapFilter><AppenderRefref="STDOUT"/></Logger><!-- By default, all log messages of level "trace" or higher will be logged. Log messages are sent to the "file" appender and log messages of level "error" and higher will be sent to the "STDOUT" appender. --><Rootlevel="trace"><AppenderRefref="file"/><AppenderRefref="STDOUT"level="error"/></Root></Loggers></Configuration>
<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE log4j:configuration PUBLIC "-//LOGGER" "http://logging.apache.org/log4j/1.2/apidocs/org/apache/log4j/xml/doc-files/log4j.dtd"><log4j:configuration><!-- an appender is an output destination, such as the console or a file; names of appenders are arbitrarily chosen. --><appendername="stdout"class="org.apache.log4j.ConsoleAppender"><layoutclass="org.apache.log4j.PatternLayout"><paramname="ConversionPattern"value="%d{ABSOLUTE} %5p %c{1}:%L - %m%n"/></layout></appender><!-- loggers of category 'org.springframework' will only log messages of level "info" or higher; if you retrieve Loggers by using the class name (e.g. Logger.getLogger(AClass.class)) and if AClass is part of the org.springframework package, it will belong to this category --><loggername="org.springframework"><levelvalue="info"/></logger><!-- everything of spring was set to "info" but for class PropertyEditorRegistrySupport we want "debug" logging --><loggername="org.springframework.beans.PropertyEditorRegistrySupport"><levelvalue="debug"/></logger><loggername="org.acegisecurity"><levelvalue="info"/></logger><root><!-- all log messages of level "debug" or higher will be logged, unless defined otherwise all log messages will be logged to the appender "stdout", unless defined otherwise --><levelvalue="debug"/><appender-refref="stdout"/></root></log4j:configuration>
TTCC is a message format used by log4j. [28] TTCC is an acronym for Time Thread Category Component. It uses the following pattern:
%r [%t] %-5p %c %x - %m%n
Where
Mnemonic | Description |
---|---|
%r | Used to output the number of milliseconds elapsed from the construction of the layout until the creation of the logging event. |
%t | Used to output the name of the thread that generated the logging event. |
%p | Used to output the priority of the logging event. |
%c | Used to output the category of the logging event. |
%x | Used to output the NDC (nested diagnostic context) associated with the thread that generated the logging event. [29] |
%X{key} | Used to output the MDC (mapped diagnostic context) associated with the thread that generated the logging event for specified key. [30] |
%m | Used to output the application supplied message associated with the logging event. |
%n | Used to output the platform-specific newline character or characters. |
Example output
467 [main] INFO org.apache.log4j.examples.Sort – Exiting main method.
A zero-day vulnerability involving remote code execution in Log4j 2, given the descriptor "Log4Shell" (CVE-2021-44228), was found and reported to Apache by Alibaba on November 24, 2021, and published in a tweet on December 9, 2021. [12] Affected services include Cloudflare, iCloud, Minecraft: Java Edition , [42] Steam, Tencent QQ, and Twitter. [43] [44] [45] The Apache Software Foundation assigned the maximum CVSS severity rating of 10 to Log4Shell, as millions of servers could be potentially vulnerable to the exploit. [45] The vulnerability was characterized by cybersecurity firm Tenable as "the single biggest, most critical vulnerability of the last decade" [13] and Lunasec's Free Wortley characterized it as "a design failure of catastrophic proportions". [46]
In the United States, the director of the Cybersecurity and Infrastructure Security Agency (CISA), Jen Easterly, termed the exploit "critical" and advised vendors to prioritize software updates, [47] and the German agency Federal Office for Information Security (BSI) designated the exploit as being at its highest threat level, calling it an "extremely critical threat situation" (translated). [48] [49] The Canadian Centre for Cyber Security (CCCS) called on organisations to take on immediate action. [50]
The feature causing the vulnerability could be disabled with a configuration setting, which had been removed [51] in Log4j version 2.15.0-rc1 (officially released on December 6, 2021, three days before the vulnerability was published), and replaced by various settings restricting remote lookups, thereby mitigating the vulnerability. [52] [53] For additional security, all features using JNDI, on which this vulnerability was based, will be disabled by default, and support for message lookups removed from version 2.16.0 onward. [54] [55]
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