CVE-2020-0688 PoC — Microsoft Exchange Server 授权问题漏洞

Source

https://github.com/onSec-fr/CVE-2020-0688-Scanner

Associated Vulnerability

Title:Microsoft Exchange Server 授权问题漏洞 (CVE-2020-0688)
Description:Microsoft Exchange Server是美国微软（Microsoft）公司的一套电子邮件服务程序。它提供邮件存取、储存、转发，语音邮件，邮件过滤筛选等功能。 Microsoft Exchange Server 中存在授权问题漏洞，该漏洞源于程序无法正确处理内存中的对象。攻击者可借助特制的电子邮件利用该漏洞在系统用户的上下文中运行任意代码。以下产品及版本受到影响：Microsoft Exchange Server 2010，Microsoft Exchange Server 2013，Micro

Description

Quick tool for checking CVE-2020-0688 on multiple hosts with a non-intrusive method.

Readme

# CVE-2020-0688-Scanner

Quick C# tool for checking CVE-2020-0688 on multiple hosts with a non-intrusive method.

## Features
  - Scan hosts from an input file.
  - Passive check : grab exchange version by scraping html content.
  - Produces an output file.
  
## Demo
[![](https://github.com/onSec-fr/CVE-2020-0688-Scanner/blob/master/demo.png?raw=true)](https://github.com/onSec-fr/CVE-2020-0688-Scanner/blob/master/demo.png?raw=true)
## How to use

### Prerequisite
  - Windows
  - .NET framework 4.5.2

#### Download
```bash
git clone https://github.com/onSec-fr/CVE-2020-0688-Scanner.git
```
#### Run
```bash
./CVE-2020-0688-Scanner.exe [path_to_input_file]
```
Note : the input file can contain ip addresses, hostnames and FQDN.

#### Disclaimer
This tool has been developed to test your own system or for authorized security testing. Make sure you check with your local laws before running this tool.

#### Limitations
Since Exchange 2013, only the first 3 parts of the version number can be retrieved in this way. This means that sometimes the server may be vulnerable if it has not the very last cumulative update. In this case the server is flagged as "maybe patched".

## References

- Unofficial build chart lists all of the known KB articles, hotfixes, update rollups and other builds of MS Exchange Server 2019, 2016, 2013, 2010, 2007, 2003, 2000, 5.5, 5.0 and 4.0 that have been released. : https://exchangeserverversions.blogspot.com/
- Analysis of CVE-2020-0688 : https://www.thezdi.com/blog/2020/2/24/cve-2020-0688-remote-code-execution-on-microsoft-exchange-server-through-fixed-cryptographic-keys
- https://fr.tenable.com/blog/cve-2020-0688-microsoft-exchange-server-static-key-flaw-could-lead-to-remote-code-execution
- nmap implementation by Kevin Beaumont : https://github.com/PwnPeter/0day-scripts/blob/2845b2d7a62c1baec581afab8fb065dde4f63413/nmap-nse/http-vuln-exchange.nse

File Snapshot


 [4.0K]  /data/pocs/50b992ce0b542188a3469199cc6b30c4985d793d
├── [ 13K]  CVE-2020-0688-Scanner.exe
├── [ 184]  CVE-2020-0688-Scanner.exe.config
├── [ 30K]  CVE-2020-0688-Scanner.pdb
├── [ 64K]  demo.png
├── [161K]  HtmlAgilityPack.dll
├── [296K]  HtmlAgilityPack.pdb
├── [152K]  HtmlAgilityPack.xml
├── [1.0K]  LICENSE
├── [1.9K]  README.md
└── [4.0K]  Sources
    ├── [ 184]  App.config
    ├── [4.0K]  bin
    │   └── [4.0K]  Release
    │       ├── [ 13K]  CVE-2020-0688-Scanner.exe
    │       ├── [ 184]  CVE-2020-0688-Scanner.exe.config
    │       ├── [ 30K]  CVE-2020-0688-Scanner.pdb
    │       ├── [161K]  HtmlAgilityPack.dll
    │       ├── [296K]  HtmlAgilityPack.pdb
    │       └── [152K]  HtmlAgilityPack.xml
    ├── [3.0K]  CVE-2020-0688-Scanner.csproj
    ├── [ 286]  CVE-2020-0688-Scanner.csproj.user
    ├── [1.1K]  CVE-2020-0688-Scanner.sln
    ├── [4.0K]  packages
    │   └── [4.0K]  HtmlAgilityPack.1.11.21
    │       ├── [1.4M]  HtmlAgilityPack.1.11.21.nupkg
    │       └── [4.0K]  lib
    │           ├── [4.0K]  Net35
    │           │   ├── [152K]  HtmlAgilityPack.dll
    │           │   ├── [344K]  HtmlAgilityPack.pdb
    │           │   └── [141K]  HtmlAgilityPack.xml
    │           ├── [4.0K]  Net40
    │           │   ├── [156K]  HtmlAgilityPack.dll
    │           │   ├── [290K]  HtmlAgilityPack.pdb
    │           │   └── [142K]  HtmlAgilityPack.XML
    │           ├── [4.0K]  Net40-client
    │           │   ├── [156K]  HtmlAgilityPack.dll
    │           │   ├── [290K]  HtmlAgilityPack.pdb
    │           │   └── [142K]  HtmlAgilityPack.xml
    │           ├── [4.0K]  Net45
    │           │   ├── [161K]  HtmlAgilityPack.dll
    │           │   ├── [296K]  HtmlAgilityPack.pdb
    │           │   └── [152K]  HtmlAgilityPack.XML
    │           ├── [4.0K]  NetCore45
    │           │   ├── [127K]  HtmlAgilityPack.dll
    │           │   ├── [200K]  HtmlAgilityPack.pdb
    │           │   └── [ 83K]  HtmlAgilityPack.XML
    │           ├── [4.0K]  netstandard1.3
    │           │   ├── [ 46K]  HtmlAgilityPack.deps.json
    │           │   ├── [143K]  HtmlAgilityPack.dll
    │           │   ├── [ 40K]  HtmlAgilityPack.pdb
    │           │   └── [133K]  HtmlAgilityPack.xml
    │           ├── [4.0K]  netstandard1.6
    │           │   ├── [ 59K]  HtmlAgilityPack.deps.json
    │           │   ├── [154K]  HtmlAgilityPack.dll
    │           │   ├── [ 43K]  HtmlAgilityPack.pdb
    │           │   └── [141K]  HtmlAgilityPack.xml
    │           ├── [4.0K]  netstandard2.0
    │           │   ├── [ 42K]  HtmlAgilityPack.deps.json
    │           │   ├── [156K]  HtmlAgilityPack.dll
    │           │   ├── [ 44K]  HtmlAgilityPack.pdb
    │           │   └── [150K]  HtmlAgilityPack.xml
    │           ├── [4.0K]  portable-net45+netcore45+wp8+MonoAndroid+MonoTouch
    │           │   ├── [127K]  HtmlAgilityPack.dll
    │           │   ├── [200K]  HtmlAgilityPack.pdb
    │           │   └── [ 83K]  HtmlAgilityPack.XML
    │           ├── [4.0K]  portable-net45+netcore45+wpa81+wp8+MonoAndroid+MonoTouch
    │           │   ├── [127K]  HtmlAgilityPack.dll
    │           │   ├── [200K]  HtmlAgilityPack.pdb
    │           │   └── [ 83K]  HtmlAgilityPack.XML
    │           └── [4.0K]  uap10.0
    │               ├── [143K]  HtmlAgilityPack.dll
    │               ├── [256K]  HtmlAgilityPack.pdb
    │               ├── [ 688]  HtmlAgilityPack.pri
    │               └── [133K]  HtmlAgilityPack.XML
    ├── [ 142]  packages.config
    ├── [ 11K]  Program.cs
    └── [4.0K]  Properties
        ├── [1.5K]  AssemblyInfo.cs
        ├── [4.0K]  Resources.Designer.cs
        └── [6.2K]  Resources.resx

18 directories, 62 files

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