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SYMPTOMSYou may receive an Access Violation in Dns.exe. This is most often occurs on computers connected to public networks, such as the Internet, where deliberate attacks are common. CAUSEThis particular attack is usually generated maliciously by typing the following command on the attacking system: telnet <mycomputer> 19 | telnet <mycomputer> 53This command causes a telnet connection to be established to port 19 (the chargen service, which generates a string of characters) with the output redirected to a telnet connection to port 53 (the DNS service.) This flood of characters causes an Access Violation in the DNS service, which is terminated, disrupting name resolution services. RESOLUTION
The Microsoft DNS Server has been modified to correct this problem.
Q152734 How to Obtain the Latest Windows NT 4.0 Service Pack For your convenience, the English version of this post-SP3 hotfix has been posted to the following Internet location. However, Microsoft recommends that you install Windows NT 4.0 Service Pack 4 to correct this problem. ftp://ftp.microsoft.com/bussys/winnt/winnt-public/fixes/usa/NT40/hotfixes-postSP3/dns-fix MORE INFORMATIONFor additional information, please see the following article(s) in the Microsoft Knowledge Base: Q162927 Telnetting to Port 53 May Crash DNS Service STATUS
Microsoft has confirmed this problem could result in some degree of
security vulnerability in Windows NT version 4.0. This problem was first corrected in Windows NT 4.0 Service Pack 4.0 and Windows NT Server 4.0, Terminal Server Edition Service Pack 4. Additional query words: 4.00 denial of service dns telnet port 53
Keywords : kbnetwork NT4SP4Fix kbbug4.00 nttcp kbfix4.00.sp4 NTSrv |
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Last Reviewed: April 10, 1999 © 2000 Microsoft Corporation. All rights reserved. Terms of Use. |