Security Attack Information

RoyATokeshi
March 26, 2004 4:52 pm

Citrix states in their article: CTX403859

CTX403859 - Security Attack Information

This document was published at: http://support.citrix.com/kb/entry.jspa?externalID=CTX403859

Document ID: CTX403859, Created on: Aug 11, 2000, Updated: Apr 23, 2003

Products: Citrix MetaFrame 1.8 for Microsoft NT 4.0 Server Terminal Server Edition, Citrix MetaFrame 1.8 for Microsoft Windows 2000, Citrix WinFrame 1.8

Security Attacks can take many forms. Here are some of the more common found:

Port Scanning and Monitoring - intruders monitor TCP/IP ports to detect vulnerabilities. Port 21 (FTP), Port 23 (telnet), Port 25 (SMTP mail), TCP/UDP Port 137 NetBIOS Name Service are some of the well known ones. Some firewalls offer reports that may show you the particular IP address scanning the firewall.

Viruses - intruders create and send software that can damage a system. A virus might damage files, corrupt critical files to the Operating System or force the computer to delete files without your knowledge. Always keep virus patterns updated on all servers.

Hostile Applications - An intruder can write and send a Java applet, CGI script HTML code or Trojan Horse to browse a system, record or delete information or generally interrupt service by taking control of the system. Basic protection from Trojan Horses should include the security permission of the Everyone Group to never have Change Permission to the %systemroot%system32 directories.

Eavesdropping - an unauthorized person intercepts the traffic between an authorized user and your system. Eavesdroppers use network monitoring, spoofing, and recording of keystrokes or intrusion into the system log. The best way to thwart eavesdropping is to use encryption to scramble data transfers.

Software Backdoor - Intruders use known security backdoors (like the well-known MS Word Help- About - System Info - Browse backdoor) to gain access to programs and files. In some cases policies can be used to "close" the door. In other cases a rewrite of the application code is necessary.

Insider Attacks - By far the most prolific and least discussed security attack occurs from authorized employees. Internal auditing to monitor file and object access will reveal habitual patterns including late-night employee logins, which may indicate improper usage.



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