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Family: Red Hat Local Security Checks --> Category: infos

RHSA-2003-201: ypserv Vulnerability Scan

Vulnerability Scan Summary
Check for the version of the ypserv packages

Detailed Explanation for this Vulnerability Test

Updated ypserv packages fixing a denial of service vulnerability are now

The ypserv package contains the Network Information Service (NIS) server.

A vulnerability has been discovered in the ypserv NIS server prior to
version 2.7. If a malicious client queries ypserv via TCP and subsequently
ignores the server's response, ypserv will block attempting to send the
reply. This results in ypserv failing to respond to other client requests.

Versions 2.7 and above of ypserv have been altered to fork a child for each
client request, thus preventing any one request from causing the server to

Red Hat recommends that users of NIS upgrade to these packages, which
contain version 2.8.0 of ypserv and are therefore not vulnerable to this

Solution :
Threat Level: High

Click HERE for more information and discussions on this network vulnerability scan.


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