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Home » Hacking News » [RHSA-2002:196-19] Updated xinetd packages fix denial of service vulnerability

[RHSA-2002:196-19] Updated xinetd packages fix denial of service vulnerability

by Nikola Strahija on December 9th, 2002 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:


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

5. Bug IDs fixed ( 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:




Red Hat Linux 7.1:





Red Hat Linux 7.2:




Red Hat Linux 7.3:



Red Hat Linux 8.0:



7. Verification:

MD5 sum Package Name
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

You can verify each package with the following command:

rpm --checksig -v

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


8. References:

9. Contact:

The Red Hat security contact is . More contact
details at

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

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