Original Post: Understanding and mitigating the Log4Shell vulnerability
Log4Shell, identified as CVE-2021-44228, is a critical remote code execution vulnerability in the popular Java logging library, Log4j 2. Discovered in November 2021 and publicly disclosed in December 2021, it arises from the improper handling of the library’s JNDI lookup feature. This feature can parse user-supplied data, potentially leading to Java deserialization vulnerabilities and remote code execution if directed to malicious endpoints. Its widespread use in Java applications makes it particularly dangerous. Mitigations include upgrading Log4j to fixed versions (2.16.0+ for Java 8+, 2.12.2 for Java 7) and disabling JNDI lookups. The Semgrep community has also developed tools to detect and address potential vulnerabilities.
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