Remote Code Injection in Apache Log4j CVE-2021-45046 - Log4Shell Scanner

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Remote Code Injection in Apache Log4j CVE-2021-45046 - Log4Shell Scanner Detail

In Apache Log4j, there is a Remote Code Injection vulnerability aka Log4Shell.

It was found that the fix to address CVE-2021-44228 in Apache Log4j 2.15.0 was incomplete in certain non-default configurations. This could allows attackers with control over Thread Context Map (MDC) input data when the logging configuration uses a non-default Pattern Layout with either a Context Lookup (for example, $${ctx:loginId}) or a Thread Context Map pattern (%X, %mdc, or %MDC) to craft malicious input data using a JNDI Lookup pattern resulting in an information leak and remote code execution in some environments and local code execution in all environments. Log4j 2.16.0 (Java 8) and 2.12.2 (Java 7) fix this issue by removing support for message lookup patterns and disabling JNDI functionality by default.

Some Advice for Common Problems

Download the latest Log4j mitigated version from its download page and upgrade to the newest version.

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