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Message-ID: <5ed07f7a05030708092d774ef8@mail.gmail.com> Date: Tue, 8 Mar 2005 00:09:24 +0800 From: Sowhat <isowhat@...il.com> To: bugtraq@...urityfocus.com, full-disclosure@...ts.grok.org.uk Subject: Gene6 FTP Server Local Privilege Escalation Vulnerability Gene6 FTP Server Local Privilege Escalation Vulnerability By Sowhat 03.Mar.2005 http://secway.org/Advisory/ad20050303.txt Product: Gene6 FTP Server Vendor: Gene6 Sarl Inc. (1) Introduction Gene6 FTP Server is a popular FTP Server for Microsoft Windows platforms. For more information: www.G6FtpServer.com (2) Details Local exploitation of a design error vulnerability in Gene6 FTP Server could allow the attacker to gain elevated Priveleges,usually the SYSTEM. The problem is that ,After a default installation,a local non-privleged user can Modify the settings of the Gene6 FTP Server,such as adding a new "SITE COMMAND",And because the Gene6 FTP Server run under the SYSTEM ,so it's easy to elevate the privelege. Exploit: 1.Logon as a unprivileged user 2.Open the Gene6 FTP Server control console.Add a FTP user account,for example,"test" 3.Add a new "SITE" COMMAND for the FTP server,to do this ,you need to map a executable files to a new SITE COMMAND.see step 4 and 5 4.Simply write a .bat file named ABC.bat ---cut here ------------------------- net user abc /add net localgroup administrators abc /add ---cut here ------------------------- 5.Map this ABC.bat to a new SITE command ,for example ,"ABC" 6.ok,now it's the time to GOT the SYSTEM privelege. Use the "test" user logon to the FTP server,and execute the following command: ftp>quote site abc OK.the ABC.bat was executed as SYSTEM,you got it ! Of course ,you can Map any executable files as you want :) (3) Impact Exploitation allows local users to obtain Local System privileges, thereby providing them with complete control of the affected system. (4) Vendor Reply Reply from the support@...tpServer.com "there are already options in the software to disallow this if running in multiple users environment which you should also report as solution. It is true that it may not be obvious though" They said that in fact there is an option to set up an FTP administrator account ,and also need some other steps. "It is true that it may not be obvious though"
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