This is a known bug. It happens because PcAnywhere thinks you are trying to
connect, and when you don't continue, the unfinished connection just hangs
around waiting forever.. Restart the hosts (version 9.0 and above) by
telnetting to it on port 5631 and pressing enter when prompted..
see http://www.securityfocus.com/bid/1095 for more info on this..
/Daniel
-----Original Message-----
From: Vacuum [mailto:vacuum_at_technotronic.com]
Sent: den 25 april 2000 23:40
To: bugtraq_at_securityfocus.com
Cc: nmap-hackers_at_insecure.org
Subject: Denial of Service Against pcAnywhere.
While performing a routine network audit, a TCP SYN scan caused
every pcAnywhere Host service on the network to stop responding.
The following versions were tested, other versions may be vulnerable as
well.
9.0.0 Build 133
9.2.0 Build 239
8.0.2 Build 220
Target Operating systems tested:
Windows NT Server Service Pack 6a -- Running 9.0.0 and 9.2.0 Versions
Windows NT Worksation Service Pack 5 Running 9.2.0 Version
Windows NT Server Service Pack 4 -- Running 8.0.2 Version
Using nmap version 2.30BETA21 (http://www.insecure.org/nmap)
Information gathering (Does not cause the crash)
nmap -sT -sU <target>
Servers running pcAnywhere version 8.x
show ports TCP 5631 and TCP 65301 open
UDP 5632 and UDP 22 open
Servers running pcAnywhere version 9.x
show ports TCP 5631 and UDP 5632 open
nmap -sS <target> will cause the pcAnywhere Host Service to stop
responding until the service is stopped and restarted.
If anyone else could confirm or deny this it would be appreciated.
-vacuum
http://www.technotronic.com
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Received on Apr 25 2000
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