RHEL 2.1 : ypserv (RHSA-2003:201)

This script is Copyright (C) 2004-2014 Tenable Network Security, Inc.


Synopsis :

The remote Red Hat host is missing a security update.

Description :

Updated ypserv packages fixing a denial of service vulnerability are
now available.

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 block.

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 issue.

See also :

https://www.redhat.com/security/data/cve/CVE-2003-0251.html
http://www.linux-nis.org/nis/ypserv/ChangeLog
http://rhn.redhat.com/errata/RHSA-2003-201.html

Solution :

Update the affected ypserv package.

Risk factor :

Medium / CVSS Base Score : 5.0
(CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P)

Family: Red Hat Local Security Checks

Nessus Plugin ID: 12404 ()

Bugtraq ID:

CVE ID: CVE-2003-0251