what is log4j, and what is the log4j vulnerability which could affect millions of connected services?

#apache #log4j security vulnerabilities ,#cve-2021-44228 ,log4j #cve-2021-44228 ,#log4j #zero #day ,zero day ,log4shell ,log4j poc ,apache log4j vulnerabilities

Log4j is logging library used by Apache products, Log4j is affected by the CVE-2021-44228 which is lead to a remote code execution vulnerability, it can be exploited without authentication. making CVE-2021-44228 an unauthenticated RCE vulnerability

Apache Log4j versions prior to 2.15.0 do not protect against attacker-controlled LDAP and other JNDI-related endpoints. When message lookup substitution is enabled, an attacker with control over log messages or log message parameters can execute arbitrary code loaded from LDAP servers. This vulnerability is also dubbed Log4Shell or LogJam.

https://www.tenable.com/blog/cve-2021-44228-proof-of-concept-for-critical-apache-log4j-remote-code-execution-vulnerability

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