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

Source

https://github.com/cuijiung/log4j-CVE-2021-4104

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.

Readme

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# Log4jShell_1.x

Log4j RCE 1.x Poc

## Attack

![](images/1.png)

![](images/2.png)

## Restriction

1. The target has jms environment
2. You need to gain access to modify the log4j.properties file

## Conclusion

Not as useful as log4shell 2.x

## Log4shell Topic

https://github.com/cckuailong/reapoc/tree/main/Topic/Log4j

## Welcome to contribute in reapoc

https://github.com/cckuailong/reapoc
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# log4j-CVE-2021-4104
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File Snapshot

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