### [CVE-2006-6696](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-6696)
![](https://img.shields.io/static/v1?label=Product&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Vulnerability&message=n%2Fa&color=brighgreen)

### Description

Double free vulnerability in Microsoft Windows 2000, XP, 2003, and Vista allows local users to gain privileges by calling the MessageBox function with a MB_SERVICE_NOTIFICATION message with crafted data, which sends a HardError message to Client/Server Runtime Server Subsystem (CSRSS) process, which is not properly handled when invoking the UserHardError and GetHardErrorText functions in WINSRV.DLL.

### POC

#### Reference
- http://isc.sans.org/diary.php?n&storyid=1965
- http://isc.sans.org/diary.php?n&storyid=1965
- http://www.security.nnov.ru/Gnews944.html
- http://www.security.nnov.ru/Gnews944.html
- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2007/ms07-021
- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2007/ms07-021

#### Github
No PoCs found on GitHub currently.