CVE-2021-29447 PoC — WordPress Authenticated XXE attack when installation is running PHP 8

Source

https://github.com/specializzazione-cyber-security/demo-CVE-2021-29447-lezione

Associated Vulnerability

Title:WordPress Authenticated XXE attack when installation is running PHP 8 (CVE-2021-29447)
Description:Wordpress is an open source CMS. A user with the ability to upload files (like an Author) can exploit an XML parsing issue in the Media Library leading to XXE attacks. This requires WordPress installation to be using PHP 8. Access to internal files is possible in a successful XXE attack. This has been patched in WordPress version 5.7.1, along with the older affected versions via a minor release. We strongly recommend you keep auto-updates enabled.

Readme


# POC CVE-2021029447 - XXE in WordPress
# WordPress 5.6-5.7 - Authenticated (Author+) XXE (CVE-2021-29447)

- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-29447


## Using

### Step1. Run WordPress

```
$ make up-wp
```

### Step2. Run Attacker web server

```
$ make up-mal
```

### Step3. Generate malicious WAV file

#### With wavefile npm

```
$ make make-wav
```

### Step4. Login to WordPress & Upload WAV file to New Media

```
open http://localhost:8000/
open http://localhost:8000/wp-admin/
```

vedi in console il file trafugato e puo' essere decodificato

# Risorse online


info sui comandi possibili nel file attaccante dtd https://www.php.net/manual/en/wrappers.php.php



### Spiegazione codice vulnerabile

https://github.com/Abdulazizalsewedy/CVE-2021-29447


### Walktroght 
- https://www.youtube.com/watch?v=tE8Smz1Jvb8
- https://github.com/Slowdeb/Tryhackme/blob/dfbdebe880ddcb5fbfc1f8608812a0e79fd7cf24/Wordpress-CVE-202129447.md?plain=1#L69
    Create a php reverse shell with "msfvenom" or use the awesome php reverse shell from [Pentestmonkey](https://github.com/pentestmonkey/php-reverse-shell). 

### Altre risorse
- https://www.trendmicro.com/it_it/research/19/d/zero-day-xml-external-entity-xxe-injection-vulnerability-in-internet-explorer-can-let-attackers-steal-files-system-info.html

File Snapshot


 [4.0K]  /data/pocs/5479775ce5065d1b37f210b914e31d1ca942103e
├── [4.0K]  attacker
│   ├── [ 525]  decode.php
│   ├── [4.0K]  malicious_wav
│   │   ├── [ 412]  index.js
│   │   ├── [  54]  package.json
│   │   └── [ 818]  package-lock.json
│   └── [4.0K]  www
│       ├── [ 193]  evil.dtd
│       ├── [ 413]  evil_.dtd
│       └── [ 209]  evil__.dtd
├── [642K]  attack_info.jpeg
├── [ 490]  docker-compose.yml
├── [4.0K]  examples
│   ├── [ 334]  01.xml
│   └── [ 159]  02.xml
├── [ 833]  Makefile
└── [1.3K]  README.md

4 directories, 13 files

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