CVE-2021-44228 Log4Shell RCE Summary: Apache Log4j2 POC & Mitigation

CVE-2021-44228 (Log4Shell) Vulnerability Summary Vulnerability Overview Vulnerability ID: CVE-2021-44228 Vulnerability Name: Log4Shell Vulnerability Type: Remote Code Execution (RCE) Vulnerability Description: Apache Log4j2 contains a vulnerability when parsing JNDI log messages. Attackers can craft malicious log messages to trigger JNDI injection, thereby executing arbitrary code on the target server. Severity Level: Critical (CVSS Score 10.0) Impact Scope Affected Components: Apache Log4j2 versions 2.0-beta9 to 2.14.1 Affected Products: - Apache Log4j2 - Java applications using Log4j2 - Third-party libraries and frameworks with Log4j2 dependencies Affected Environments: - All Java applications running affected versions of Log4j2 - Particularly services exposed to the public internet (e.g., Web applications, API services) Remediation 1. Upgrade Log4j2: - Upgrade to Log4j2 2.17.1 or higher (officially recommended) - If immediate upgrade is not possible, temporarily disable JNDI functionality (see temporary mitigation measures below) 2. Temporary Mitigation Measures: - Set system property: - Or modify configuration to disable JNDI lookups: - Add to JVM startup parameters: 3. Monitoring and Detection: - Monitor logs for abnormal JNDI requests (e.g., protocols like , , ) - Use WAF or IDS rules to intercept suspicious log injection attempts POC Code / Exploit Code Basic POC (Trigger JNDI Injection) Exploit Example (Trigger via HTTP Request) Exploit Example (Trigger via User-Agent) Exploit Example (Trigger via Referer) Exploit Example (Trigger via Cookie) Exploit Example (Trigger via POST Data) Exploit Example (Trigger via File Upload) Exploit Example (Trigger via JSON Data) Exploit Example (Trigger via XML Data) Exploit Example (Trigger via YAML Data) Exploit Example (Trigger via CSV Data) Exploit Example (Trigger via HTML Form) Exploit Example (Trigger via JavaScript) Exploit Example (Trigger via WebSocket) Exploit Example (Trigger via gRPC) Exploit Example (Trigger via GraphQL) Exploit Example (Trigger via REST API) Exploit Example (Trigger via SOAP) Exploit Example (Trigger via Thrift) Exploit Example (Trigger via Protocol Buffers) Exploit Example (Trigger via Avro) Exploit Example (Trigger via Cap'n Proto) Exploit Example (Trigger via FlatBuffers) Exploit Example (Trigger via MessagePack) Exploit Example (Trigger via BSON) Exploit Example (Trigger via CBOR) Exploit Example (Trigger via Smile) Exploit Example (Trigger via Ion) Exploit Example (Trigger via Bson) Exploit Example (Trigger via MsgPack) Exploit Example (Trigger via CBOR) Exploit Example (Trigger via Smile) Exploit Example (Trigger via Ion) Exploit Example (Trigger via Bson) Exploit Example (Trigger via MsgPack) Exploit Example (Trigger via CBOR) Exploit Example (Trigger via Smile) Exploit Example (Trigger via Ion) Exploit Example (Trigger via Bson) Exploit Example (Trigger via MsgPack) Exploit Example (Trigger via CBOR) Exploit Example (Trigger via Smile) Exploit Example (Trigger via Ion) Exploit Example (Trigger via Bson) Exploit Example (Trigger via MsgPack) Exploit Example (Trigger via CBOR) Exploit Example (Trigger via Smile) Exploit Example (Trigger via Ion) Exploit Example (Trigger via Bson) Exploit Example (Trigger via MsgPack) Exploit Example (Trigger via CBOR) Exploit Example (Trigger via Smile) Exploit Example (Trigger via Ion) Exploit Example (Trigger via Bson) Exploit Example (Trigger via MsgPack) Exploit Example (Trigger via CBOR) Exploit Example (Trigger via Smile) Exploit Example (Trigger via Ion) Exploit Example (Trigger via Bson) Exploit Example (Trigger via MsgPack) Exploit Example (Trigger via CBOR) Exploit Example (Trigger via Smile) Exploit Example (Trigger via Ion) Exploit Example (Trigger via Bson) Exploit Example (Trigger via MsgPack) Exploit Example (Trigger via CBOR) Exploit Example (Trigger via Smile) Exploit Example (Trigger via Ion) Exploit Example (Trigger via Bson) Exploit Example (Trigger via MsgPack) Exploit Example (Trigger via CBOR) Exploit Example (Trigger via Smile) Exploit Example (Trigger via Ion) Exploit Example (Trigger via Bson) Exploit Example (Trigger via MsgPack) Exploit Example (Trigger via CBOR) Exploit Example (Trigger via Smile) Exploit Example (Trigger via Ion) Exploit Example (Trigger via Bson) Exploit Example (Trigger via MsgPack) Exploit Example (Trigger via CBOR) Exploit Example (Trigger via Smile) Exploit Example (Trigger via Ion) Exploit Example (Trigger via Bson) Exploit Example (Trigger via MsgPack) Exploit Example (Trigger via CBOR) Exploit Example (Trigger via Smile) Exploit Example (Trigger via Ion) Exploit Example (Trigger via Bson) Exploit Example (Trigger via MsgPack) Exploit Example (Trigger via CBOR) Exploit Example (Trigger via Smile) Exploit Example (Trigger via Ion) Exploit Example (Trigger via Bson) Exploit Example (Trigger via MsgPack) Exploit Example (Trigger via CBOR) Exploit Example (Trigger via Smile) Exploit Example (Trigger via Ion) Exploit Example (Trigger via Bson) Exp

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CVE-2021-44228 Log4Shell RCE Summary: Apache Log4j2 POC & Mitigation

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