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

Source

https://github.com/r3kind1e/Log4Shell-obfuscated-payloads-generator

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

Generate primary obfuscated or secondary obfuscated CVE-2021-44228 or CVE-2021-45046 payloads to evade WAF detection.

Readme

# Log4Shell-obfuscated-payloads-generator
Log4Shell-obfuscated-payloads-generator can generate primary obfuscated or secondary obfuscated CVE-2021-44228 or CVE-2021-45046 payloads to evade WAF detection.

[The design idea of Log4Shell-obfuscated-payloads-generator](https://r3kind1e.github.io/2022/05/26/Log4Shell-obfuscated-payloads-generator/)

## Installation
```
git clone https://github.com/r3kind1e/Log4Shell-obfuscated-payloads-generator.git
```

Log4Shell-obfuscated-payloads-generator works out of the box with Python version 3.x on any platform.

## Usage
To get a list of basic options use:

```
python3 Log4Shell-obfuscated-payloads-generator.py -h
```

To get usage examples use:

```
python3 Log4Shell-obfuscated-payloads-generator.py -hh
```

## Screenshots
`-h`: get a list of basic options
![help](img/help.png)

`-hh`: get usage examples
![usage-examples](img/usage-examples.png)

With a single option to generate payloads, the `-s` option specifies the malicious server:
```
--generate-primary-obfuscated-cve-2021-44228-payload 8 -s ck0pf4l6fmq4w0v17o7t894txk3arz.oastify.com
```
![primary44228](img/primary44228.png)
![burp-collaborator-client1](img/burp-collaborator-client1.png)

```
--generate-primary-obfuscated-cve-2021-45046-payload 4 -s x53a0p6r07bphlgms9setupei5owcl.oastify.com
```
![primary45046](img/primary45046.png)

```
--generate-secondary-obfuscated-cve-2021-44228-payload 5 -s oia1rpap41mhxkp6rdbbywit1k7avz.oastify.com
```
![secondary44228](img/secondary44228.png)
![burp-collaborator-client2](img/burp-collaborator-client2.png)

```
--generate-secondary-obfuscated-cve-2021-45046-payload 5 -s 3vzg44n4hgzwaz2l4soqbbv8ezkq8f.oastify.com
```
![secondary45046](img/secondary45046.png)

With multiple options to generate payloads, the `-s` option specifies a malicious server:
```
--generate-primary-obfuscated-cve-2021-44228-payload 4 --generate-secondary-obfuscated-cve-2021-44228-payload 4 -s exfr6fpfjr17ca4w63q1dmxjgam2ar.oastify.com
```
![primary44228secondary44228](img/primary44228secondary44228.png)

Without specifying a malicious server with the `-s` option, the `{{callback_host}}` placeholder will be preserved in the generated payloads:
```
--generate-primary-obfuscated-cve-2021-44228-payload 3
```
![primary44228-without-server](img/primary44228-without-server.png)
```
--generate-primary-obfuscated-cve-2021-45046-payload 3 --generate-secondary-obfuscated-cve-2021-45046-payload 7
```
![primary45046secondary45046](img/primary45046secondary45046.png)

File Snapshot


 [4.0K]  /data/pocs/3445532377507d993acea96e60a6ee533a1d767c
├── [4.0K]  img
│   ├── [169K]  burp collaborator client1.png
│   ├── [169K]  burp-collaborator-client1.png
│   ├── [200K]  burp collaborator client2.png
│   ├── [200K]  burp-collaborator-client2.png
│   ├── [186K]  help.png
│   ├── [358K]  primary44228.png
│   ├── [311K]  primary44228secondary44228.png
│   ├── [158K]  primary44228-without-server.png
│   ├── [284K]  primary45046.png
│   ├── [314K]  primary45046secondary45046.png
│   ├── [409K]  secondary44228.png
│   ├── [325K]  secondary45046.png
│   └── [175K]  usage-examples.png
├── [1.0K]  LICENSE
├── [ 27K]  Log4Shell-obfuscated-payloads-generator.py
├── [4.0K]  payloads_template
│   ├── [ 577]  cve_2021_44228_payloads_template.txt
│   └── [ 347]  cve_2021_45046_payloads_template.txt
├── [4.0K]  primary_obfuscated_template
│   ├── [ 554]  delimiter_obfuscated.txt
│   ├── [ 798]  lower_case_obfuscated.txt
│   └── [ 798]  upper_case_obfuscated.txt
├── [2.4K]  README-CN.md
├── [2.5K]  README.md
├── [  16]  requirements.txt
└── [4.0K]  secondary_obfuscated_template
    ├── [1.3K]  delimiter_obfuscated.txt
    ├── [ 278]  lookup_prefix_char_obfuscated.txt
    ├── [1.5K]  lower_case_obfuscated.txt
    └── [1.5K]  upper_case_obfuscated.txt

4 directories, 27 files

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