Microsoft IIS FTP 5.0 Remote SYSTEM Exploit

A remote Microsoft FTP server exploit was released today by Kingcope, and can be found at http://milw0rm.com/exploits/9541,

A quick examination of the exploit showed some fancy manipulations in a highly restrictive environment that lead to a ”useradd” type payload. The main issue was the relatively small payload size allowed by the SITE command, which was limited to around 500 bytes.

After a bit of tinkering around, we saw that the PASSWORD field would be most suitable to shove a larger payload (bindshell). A quick replacement of the original “user add” shellcode with a secondary encoded egghunter – and a bind shell was presented to us! I wonder how long this 0day has been around…As Rel1k would say to logan_WHD…”it’s OK, it’s OK…”.

The exploit can be downloaded from BackTrack's exploit archive. To entertain the masses, they also made “Microsoft IIS 5.0 FTP 0 Day – The movie“

Microsoft reports attacks using IIS vulnerability

A vulnerability in Microsoft's software for housing Web sites is now being used for "limited attacks" on the servers it's running on, the company said Friday.

Microsoft disclosed the Internet Information Services (IIS) vulnerability on Monday and said Friday it's still working on a security update to fix the problem. In the meantime, the advisory has instructions for a workaround, including disabling various elements of the vulnerable FTP (File Transfer Protocol) service to upload and download files.

According to the advisory, the vulnerability could let somebody run arbitrary code on a server using FTP on IIS 5.0 and conduct a denial-of-service attack using FTP on IIS 5.1, 6.0, and 7.0. The present version 7.5 isn't affected, though, and FTP 7.5 can be downloaded and installed on IIS 7.0 to protect it.

"Customers should be aware that the Download Center has FTP 7.5 available for Windows Vista and Windows Server 2008. FTP 7.5 is not vulnerable to any of these exploits," said Alan Wallace, senior communications manager for Microsoft's security response communications team, in a statement.

Initially, the company said it was investigating a vulnerability only with versions 5 and 6 of IIS

Source: cnet.