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Vulnerability Assessment & Network Security Forums |
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If through a vulnerability assessment, a network security issue is detected for the vulnerability below, applying the appropriate security patches in a timely matter is very important. If you have detected that your system has already been compromised, following CERT's Network Security recovery document will assist with recommended steps for system recovery. Home >> Browse Vulnerability Assessment Database >> Slackware Local Security Checks >> SSA-2003-251-01 inetd DoS patched Vulnerability Assessment Details
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SSA-2003-251-01 inetd DoS patched |
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SSA-2003-251-01 inetd DoS patched Detailed Explanation for this Vulnerability Assessment Upgraded inetd packages are available for Slackware 8.1, 9.0 and - -current. These fix a previously hard-coded limit of 256 connections-per-minute, after which the given service is disabled for ten minutes. A possible hacker could use a quick burst of connections every ten minutes to effectively disable a service. Once upon a time, this was an intentional feature of inetd, but in today's world it has become a bug. Even having inetd look at the source IP and try to limit only the source of the attack would be problematic since TCP source addresses are so easily faked. So, the approach we have taken (borrowed from FreeBSD) is to disable this rate limiting "feature" by default. It can be reenabled by providing a -R for obvious reasons we do not recommend this. Any site running services through inetd that they would like protected from this simple DoS attack should upgrade to the new inetd package immediately. Networks Security ID: Vulnerability Assessment Copyright: This script is Copyright (C) 2005 Michel Arboi |
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