Author: Ye Yint Min Thu Htut 1. OVERVIEW The FTP Commander is vulnerable to Insecure DLL Hijacking Vulnerability. Similar terms that describe this vulnerability have been come up with Remote Binary Planting, and Insecure DLL Loading/Injection/Hijacking/Preloading. 2. PRODUCT DESCRIPTION FTP Commander is an FTP client for Windows. The program is developed by InternetSoft Corporation. Features include multiple connections, SSH, SSL, scheduler and backup tool, proxy and firewall support, chmod features, and localization for over 20 languages 3. VULNERABILITY DESCRIPTION The FTP Commander application passes an insufficiently qualified path in loading an external library when a user launch the application Affected Library List --------------------- # dwmapi.dll 4. VERSIONS AFFECTED 8.02 and prior 5. PROOF-OF-CONCEPT/EXPLOIT http://blog.pentest.space/2017/07/023-ftp-commander-802-unsafe-dll.html Tested Platform: Windows 7 x64 (Fresh Windows) 6. IMPACT This occurs when an application fails to resolve a DLL because the DLL does not exist in the specified path or search directories. If this happens, a malicious Dll with the same name can be placed in the specified path directory leading to remote code execution. 7. SOLUTION For application developers: Require set paths for DLLs in applications For system administrators: Disable write permissions to relative application folders Utilize least privilege access to prevent users (and applications) from having too much access to the system For both groups: Microsoft has a great article explaining the DLL-related registry keys and how they can be used to protect applications - http://blogs.technet.com/b/srd/archive/2010/08/23/more- information-about-dll-preloading-remote-attack-vector.aspx 8. VENDOR InternetSoft Corporation www.internet-soft.com/ftpcomm.htm 9. CREDIT This vulnerability was discovered by Ye Yint Min Thu htut, http://pentest.space 10. DISCLOSURE TIME-LINE 07-26-2017: vulnerability discovered 07-26-2010: notified vendor 08-29-2017: vulnerability disclosed 11. REFERENCES https://support.microsoft.com/en-us/help/2389418/secure- loading-of-libraries-to-prevent-dll-preloading-attacks https://cwe.mitre.org/data/definitions/427.html # Iranian Exploit DataBase = http://IeDb.Ir [2017-08-04]