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CVE-2021-4104 PoC — Deserialization of untrusted data in JMSAppender in Apache Log4j 1.2

Source
https://github.com/projectdiscovery/nuclei-templates/blob/main/http/vulnerabilities/other/flexnet-log4j-rce.yaml
Associated Vulnerability
Title:Deserialization of untrusted data in JMSAppender in Apache Log4j 1.2 (CVE-2021-4104)
Description:JMSAppender in Log4j 1.2 is vulnerable to deserialization of untrusted data when the attacker has write access to the Log4j configuration. The attacker can provide TopicBindingName and TopicConnectionFactoryBindingName configurations causing JMSAppender to perform JNDI requests that result in remote code execution in a similar fashion to CVE-2021-44228. Note this issue only affects Log4j 1.2 when specifically configured to use JMSAppender, which is not the default. Apache Log4j 1.2 reached end of life in August 2015. Users should upgrade to Log4j 2 as it addresses numerous other issues from the previous versions.
Description
Flexnet is susceptible to Log4j JNDI remote code execution.
File Snapshot

 id: flexnet-log4j-rce

info:
  name: Flexnet - Remote Code Execution (Apache Log4j)
  author: shaikh

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