(Red Hat Issues Fix) RedHat's Xinetd Networking Daemon Package May Allow Remote Users to Execute Arbitrary Code as Root and Allow Local Users to Modify System Files
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SecurityTracker Alert ID: 1001945 |
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SecurityTracker URL: http://securitytracker.com/id/1001945
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CVE Reference:
GENERIC-MAP-NOMATCH
(Links to External Site)
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Date: Jul 7 2001
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Impact:
Execution of arbitrary code via network, Modification of system information
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Fix Available: Yes Vendor Confirmed: Yes
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Version(s): prior to 2.1.8.9pre15-2
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Description:
Red Hat reports a vulnerability in earlier versions of their Xinetd package that allows local users to modify some system files and may allow remote users to execute arbitrary code on the server with root-level privileges.
It is reported that Xinetd runs with umask 0, meaning that applications using the xinetd umask and not setting the permissions themselves will create world writable files, which may not have been intended.
This could allow local users to modify system files, potentially leading to further exploit scenarios.
It is also reported that there is a potential buffer overflow vulnerability that may allow remote users to execute code on the server with root-level privileges (see the Message History for details on this vulnerability).
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Impact:
A local user can modify some files that were created by applications using Xinetd's umask. A remote user can cause a buffer overflow on the server while the Xinetd service is running with root-level privileges, potentially allowing for remote code execution.
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Solution:
The vendor has released a fix in the 2.3.0 release. See the Source Message for the vendor's advisory containing directions on how to obtain the appropriate fix.
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Vendor URL: www.redhat.com/ (Links to External Site)
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Cause:
Access control error
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Underlying OS:
Linux (Red Hat Linux)
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Message History:
This archive entry is a follow-up to the message listed below.
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Source Message Contents
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Date: Fri, 6 Jul 2001 15:15 -0400
Subject: [RHSA-2001:092-02] Updated xinetd package available for Red Hat Linux 7 and 7.1
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---------------------------------------------------------------------
Red Hat, Inc. Red Hat Security Advisory
Synopsis: Updated xinetd package available for Red Hat Linux 7 and 7.1
Advisory ID: RHSA-2001:092-02
Issue date: 2001-07-03
Updated on: 2001-07-06
Product: Red Hat Linux
Keywords: xinetd umask 2.4 kernel identd
Cross references:
Obsoletes: RHSA-2001:075
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1. Topic:
A vulnerability has been found in xinetd's string handling.
2. Relevant releases/architectures:
Red Hat Linux 7.0 - alpha, i386
Red Hat Linux 7.1 - alpha, i386
3. Problem description:
A boundary checking case in xinetd's string handling was fixed in the 2.3.0
release of xinetd.
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):
6. RPMs required:
Red Hat Linux 7.0:
SRPMS:
ftp://updates.redhat.com/7.0/en/os/SRPMS/xinetd-2.3.0-1.71.src.rpm
alpha:
ftp://updates.redhat.com/7.0/en/os/alpha/xinetd-2.3.0-1.71.alpha.rpm
i386:
ftp://updates.redhat.com/7.0/en/os/i386/xinetd-2.3.0-1.71.i386.rpm
Red Hat Linux 7.1:
SRPMS:
ftp://updates.redhat.com/7.1/en/os/SRPMS/xinetd-2.3.0-1.71.src.rpm
alpha:
ftp://updates.redhat.com/7.1/en/os/alpha/xinetd-2.3.0-1.71.alpha.rpm
i386:
ftp://updates.redhat.com/7.1/en/os/i386/xinetd-2.3.0-1.71.i386.rpm
7. Verification:
MD5 sum Package Name
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cf2d969d79d7061ef0cf539f9a846de6 7.0/en/os/SRPMS/xinetd-2.3.0-1.71.src.rpm
bf759f5eebb7aa1ff571ef1867c65f70 7.0/en/os/alpha/xinetd-2.3.0-1.71.alpha.rpm
af532d612480937736f76b6fbeb8218d 7.0/en/os/i386/xinetd-2.3.0-1.71.i386.rpm
cf2d969d79d7061ef0cf539f9a846de6 7.1/en/os/SRPMS/xinetd-2.3.0-1.71.src.rpm
bf759f5eebb7aa1ff571ef1867c65f70 7.1/en/os/alpha/xinetd-2.3.0-1.71.alpha.rpm
af532d612480937736f76b6fbeb8218d 7.1/en/os/i386/xinetd-2.3.0-1.71.i386.rpm
These packages are GPG signed by Red Hat, Inc. for security. Our key
is available at:
http://www.redhat.com/corp/contact.html
You can verify each package with the following command:
rpm --checksig <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:
rpm --checksig --nogpg <filename>
8. References:
Copyright(c) 2000, 2001 Red Hat, Inc.
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