(Conectiva 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: 1001884 |
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SecurityTracker URL: http://securitytracker.com/id/1001884
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CVE Reference:
GENERIC-MAP-NOMATCH
(Links to External Site)
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Date: Jun 30 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. 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 (Conectiva)
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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: Sat, 30 Jun 2001 14:01:51 -0300
Subject: [conectiva-updates] [CLA-2001:406] Conectiva Linux Security Announcement - xinetd
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-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
- --------------------------------------------------------------------------
CONECTIVA LINUX SECURITY ANNOUNCEMENT
- --------------------------------------------------------------------------
PACKAGE : xinetd
SUMMARY : Remote buffer overflow
DATE : 2001-06-30 14:00:00
ID : CLA-2001:406
RELEVANT
RELEASES : 6.0
- -------------------------------------------------------------------------
DESCRIPTION
"xinetd" is an alternative to the inetd superserver.
Sebastian Krahmer from SuSe found an additional vulnerability in the
xinetd package that was not addressed in the previous announcement.
Internal string handling functions of xinetd do not properly handle
length arguments of zero. This can lead to buffer overflows and
arbitrary remote code execution.
The xinetd package is not used by default in Conectiva Linux 6.0,
therefore only users who explicitly changed the configuration of
their services in order to use xinetd will be vulnerable.
SOLUTION
It is recommended that all xinetd users upgrade their packages. This
update will restart the service if it is already running.
DIRECT DOWNLOAD LINKS TO THE UPDATED PACKAGES
ftp://atualizacoes.conectiva.com.br/6.0/SRPMS/xinetd-2.1.8.9pre16-1U60_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/6.0/RPMS/xinetd-2.1.8.9pre16-1U60_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/6.0/RPMS/xinetd-devel-2.1.8.9pre16-1U60_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/6.0/RPMS/xinetd-devel-static-2.1.8.9pre16-1U60_1cl.i386.rpm
ADDITIONAL INSTRUCTIONS
Users of Conectiva Linux version 6.0 or higher may use apt to perform
upgrades of RPM packages:
- add the following line to /etc/apt/sources.list if it is not there yet
(you may also use linuxconf to do this):
rpm [cncbr] ftp://atualizacoes.conectiva.com.br 6.0/conectiva updates
(replace 6.0 with the correct version number if you are not running CL6.0)
- run: apt-get update
- after that, execute: apt-get upgrade
Detailed instructions reagarding the use of apt and upgrade examples
can be found at http://distro.conectiva.com.br/atualizacoes/#apt?idioma=en
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All packages are signed with Conectiva's GPG key. The key and instructions
on how to import it can be found at
http://distro.conectiva.com.br/seguranca/chave/?idioma=en
Instructions on how to check the signatures of the RPM packages can be
found at http://distro.conectiva.com.br/seguranca/politica/?idioma=en
- -------------------------------------------------------------------------
All our advisories and generic update instructions can be viewed at
http://distro.conectiva.com.br/atualizacoes/?idioma=en
- -------------------------------------------------------------------------
subscribe: conectiva-updates-subscribe@papaleguas.conectiva.com.br
unsubscribe: conectiva-updates-unsubscribe@papaleguas.conectiva.com.br
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