On Wed, 20 Jul 2005, Bilal Nasrallah wrote:
Hi Josh,
I was still able to telnet to the box after the scan, so I'd say the
telnet service didn't crash.
Hi Bilal,
It is possible that the telnet server came back to life, such as if it
is run from an Inet server. I would run hping in one window (sending SYN
packets to port 23) and run the plugin via the command line in another
and see if the server really crashes or not. I'm not sure which plugin
is in question here, but I would also read the source of the plugin to
understand what test it is doing and how/why it decided that the server
crashed. To be really certain if this is a FP or not get a pcap dump of
the test and review the packets. If you want you can send me a copy of
the dump and I can help you review it.
--
- Josh
Bilal
-----Original Message-----
From: Josh Zlatin-Amishav [mailto:josh@tkos.co.il]
Sent: Wednesday, July 20, 2005 3:53 PM
To: Nasrallah, Bilal [CAR:1229:EXCH]
Cc: nessus@list.nessus.org
Subject: Re: Buffer Overflow Vulnerability
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
GPG: 445F 7FB3 3D99 EE8C 99A4 4313 352D FFD4 02B2 C7F3
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