Ethical Hacking

Learn to find vulnerabilities before the bad guys do! Gain real world hands on hacking experience in our state of the art hacking lab. Course designed and taught by expert instructors with years of penetration testing experience. 12 student maximum in every class. Certification attempt included in every package.
Computer Forensics Training at InfoSec Institute

Gain the in-demand skills of a certified computer examiner, learn to recover trace data left behind by fraud, theft, and cybercrime perpetrators. Discover the source of computer crime and abuse at your organization so that it never happens again. All of our class sizes are guaranteed to be 12 students or less to facilitate one-on-one interaction with one of our expert instructors.




Network Security Nessus-Users
[Top] [All Lists]
<prev [Date] next>
[Advanced]
 <prev [Thread] next>

Re: Buffer Overflow Vulnerability

from [Josh Zlatin-Amishav] Network Security [Permanent Link]
Subject: Re: Buffer Overflow Vulnerability
Date: Wed, 20 Jul 2005 22:52:57 +0300 (IDT) 
On Wed, 20 Jul 2005, Bilal Nasrallah wrote:

Hi Folks,
I've run a scan on one of our devices and the report highlighted a
security hole in the telnet server (TCP port 23). It  reported the
following:
"The Telnet server does not return an expected number of replies when it
receives a long sequence of 'Are You There' commands. This probably
means it overflows one of its internal buffers and crashes. It is likely
an attacker could abuse this bug to gain control over the remote host's
super user."
However, the box didn't crash! Is it still a high vulnerability?


Hi Bilal,
Did the telnet service crash though? When you send SYN packets to port 23 on
the target machine do you receive SYN/ACK in return (you can test this
with hping).

--
 - Josh


Thanks,


Bilal Nasrallah
Network Management Engineering
Information Services
Nortel
ESN 393-3791 or (613) 763-3791
Mailstop 04351M18 Ottawa, Ontario
Email: bilaln@nortel.com



--
  - Josh

GPG: 445F 7FB3 3D99 EE8C 99A4  4313 352D FFD4 02B2 C7F3
_______________________________________________
Nessus mailing list
Nessus@list.nessus.org
http://mail.nessus.org/mailman/listinfo/nessus

[More with this subject...]




<Prev in Thread] Current Thread [Next in Thread>
Previous by Date:  RE: Buffer Overflow Vulnerability, Josh Zlatin-Amishav
Next by Date:  configure: error: Could not find OpenSSL and OpenSSL headers on your system, Dave Long
Previous by Thread:  Buffer Overflow Vulnerability, Bilal Nasrallah
Next by Thread:  Re: Buffer Overflow Vulnerability, George A. Theall
Indexes:  [Date] [Thread] [Top] [All Lists]