Red Hat Linux Advisory: xinetd

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                    Red Hat, Inc. Red Hat Security Advisory

Synopsis:          Updated xinetd packages fix denial of service vulnerability
Advisory ID:       RHSA-2002:196-19
Issue date:        2002-09-06
Updated on:        2002-12-02
Product:           Red Hat Linux
Keywords:          xinetd file descriptor leak flaw:dos-release
Cross references:
Obsoletes:
CVE Names:         CAN-2002-0871
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1. Topic:

Xinetd contains a denial-of-service (DoS) vulnerability.

UPDATE 2002-12-02: Updated packages are available to fix issues encountered
with the previous errata packages.

2. Relevant releases/architectures:

Red Hat Linux 7.0 - i386, alpha
Red Hat Linux 7.1 - i386, alpha, ia64
Red Hat Linux 7.2 - i386, ia64
Red Hat Linux 7.3 - i386
Red Hat Linux 8.0 - i386

3. Problem description:

Xinetd is a secure replacement for inetd, the Internet services daemon.

Versions of Xinetd prior to 2.3.7 leak file descriptors for the signal
pipe to services that are launched by xinetd. This could allow an attacker
to execute a DoS attack via the pipe. The Common Vulnerabilities and
Exposures project has assigned the name CAN-2002-0871 to this issue.

Red Hat Linux 7.3 shipped with xinetd version 2.3.4 and is therefore
vulnerable to this issue.  All users are advised to upgrade to the errata
packages which fix the vulnerability.

Thanks to Solar Designer for discovering this issue.

4. Solution:

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

To update all RPMs for your particular architecture, run:

rpm -Fvh [filenames]

where [filenames] is a list of the RPMs you wish to upgrade.  Only those
RPMs which are currently installed will be updated.  Those RPMs which are
not installed but included in the list will not be updated.  Note that you
can also use wildcards (*.rpm) if your current directory only contains the
desired RPMs.

Please note that this update is also available via Red Hat Network.  Many
people find this an easier way to apply updates.  To use Red Hat Network,
launch the Red Hat Update Agent with the following command:

up2date

This will start an interactive process that will result in the appropriate
RPMs being upgraded on your system.

5. Bug IDs fixed (http://bugzilla.redhat.com/bugzilla for more info):

74696 - Broken tcp_wrappers support
76146 - xinetd 2.3.9 causes hanging CLOSE_WAIT connections
77781 - xinetd stop serving the services because "Too many open files"

6. RPMs required:

Red Hat Linux 7.0:

SRPMS:
ftp://updates.redhat.com/7.0/en/os/SRPMS/xinetd-2.3.7-4.7x.src.rpm

alpha:
ftp://updates.redhat.com/7.0/en/os/alpha/xinetd-2.3.7-4.7x.alpha.rpm

i386:
ftp://updates.redhat.com/7.0/en/os/i386/xinetd-2.3.7-4.7x.i386.rpm

Red Hat Linux 7.1:

SRPMS:
ftp://updates.redhat.com/7.1/en/os/SRPMS/xinetd-2.3.7-4.7x.src.rpm

alpha:
ftp://updates.redhat.com/7.1/en/os/alpha/xinetd-2.3.7-4.7x.alpha.rpm

i386:
ftp://updates.redhat.com/7.1/en/os/i386/xinetd-2.3.7-4.7x.i386.rpm

ia64:
ftp://updates.redhat.com/7.1/en/os/ia64/xinetd-2.3.7-4.7x.ia64.rpm

Red Hat Linux 7.2:

SRPMS:
ftp://updates.redhat.com/7.2/en/os/SRPMS/xinetd-2.3.7-4.7x.src.rpm

i386:
ftp://updates.redhat.com/7.2/en/os/i386/xinetd-2.3.7-4.7x.i386.rpm

ia64:
ftp://updates.redhat.com/7.2/en/os/ia64/xinetd-2.3.7-4.7x.ia64.rpm

Red Hat Linux 7.3:

SRPMS:
ftp://updates.redhat.com/7.3/en/os/SRPMS/xinetd-2.3.7-4.7x.src.rpm

i386:
ftp://updates.redhat.com/7.3/en/os/i386/xinetd-2.3.7-4.7x.i386.rpm

Red Hat Linux 8.0:

SRPMS:
ftp://updates.redhat.com/8.0/en/os/SRPMS/xinetd-2.3.7-5.src.rpm

i386:
ftp://updates.redhat.com/8.0/en/os/i386/xinetd-2.3.7-5.i386.rpm



7. Verification:

MD5 sum                          Package Name
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38b5f218a384a7ba7cdc0168e2d5f892 7.0/en/os/SRPMS/xinetd-2.3.7-4.7x.src.rpm
ee9c54046762e1b3aa53d66da927f9ce 7.0/en/os/alpha/xinetd-2.3.7-4.7x.alpha.rpm
b4d37fb0fda2fa6606befda4cbd7d458 7.0/en/os/i386/xinetd-2.3.7-4.7x.i386.rpm
38b5f218a384a7ba7cdc0168e2d5f892 7.1/en/os/SRPMS/xinetd-2.3.7-4.7x.src.rpm
ee9c54046762e1b3aa53d66da927f9ce 7.1/en/os/alpha/xinetd-2.3.7-4.7x.alpha.rpm
b4d37fb0fda2fa6606befda4cbd7d458 7.1/en/os/i386/xinetd-2.3.7-4.7x.i386.rpm
569ae16839959297a167bf29e1fb5293 7.1/en/os/ia64/xinetd-2.3.7-4.7x.ia64.rpm
38b5f218a384a7ba7cdc0168e2d5f892 7.2/en/os/SRPMS/xinetd-2.3.7-4.7x.src.rpm
b4d37fb0fda2fa6606befda4cbd7d458 7.2/en/os/i386/xinetd-2.3.7-4.7x.i386.rpm
569ae16839959297a167bf29e1fb5293 7.2/en/os/ia64/xinetd-2.3.7-4.7x.ia64.rpm
38b5f218a384a7ba7cdc0168e2d5f892 7.3/en/os/SRPMS/xinetd-2.3.7-4.7x.src.rpm
b4d37fb0fda2fa6606befda4cbd7d458 7.3/en/os/i386/xinetd-2.3.7-4.7x.i386.rpm
07c7f1cedf7b9a20bad65815765d4ff2 8.0/en/os/SRPMS/xinetd-2.3.7-5.src.rpm
26e6f6faec33503f3538a4ac80c82ce2 8.0/en/os/i386/xinetd-2.3.7-5.i386.rpm


These packages are GPG signed by Red Hat, Inc. for security.  Our key
is available at http://www.redhat.com/about/contact/pgpkey.html

You can verify each package with the following command:

     rpm --checksig -v <filename>

If you only wish to verify that each package has not been corrupted or
tampered with, examine only the md5sum with the following command:

     md5sum <filename>


8. References:

http://www.xinetd.org/
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-0871

9. Contact:

The Red Hat security contact is <security@redhat.com>.  More contact
details at http://www.redhat.com/solutions/security/news/contact.html

Copyright(c) 2000, 2001, 2002 Red Hat, Inc.