This script is Copyright (C) 2013 Tenable Network Security, Inc.
The remote Scientific Linux host is missing one or more security
When xinetd services are configured with the 'TCPMUX' or 'TCPMUXPLUS'
type, and the tcpmux-server service is enabled, those services are
accessible via port 1. It was found that enabling the tcpmux-server
service (it is disabled by default) allowed every xinetd service,
including those that are not configured with the 'TCPMUX' or
'TCPMUXPLUS' type, to be accessible via port 1. This could allow a
remote attacker to bypass intended firewall restrictions.
This update also fixes the following bugs :
- Prior to this update, a file descriptor array in the
service.c source file was not handled as expected. As a
consequence, some of the descriptors remained open when
xinetd was under heavy load. Additionally, the system
log was filled with a large number of messages that took
up a lot of disk space over time. This update modifies
the xinetd code to handle the file descriptors correctly
and messages no longer fill the system log.
- Prior to this update, services were disabled permanently
when their CPS limit was reached. As a consequence, a
failed bind operation could occur when xinetd attempted
to restart the service. This update adds additional
logic that attempts to restart the service. Now, the
service is only disabled if xinetd cannot restart the
service after 30 attempts.
See also :
Update the affected xinetd and / or xinetd-debuginfo packages.
Risk factor :
Medium / CVSS Base Score : 4.3