(Conectiva Issues Fix) 'nfs-utils' Buffer Overflow May Let Remote Users Execute Arbitrary Code
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SecurityTracker Alert ID: 1007261 |
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SecurityTracker URL: http://securitytracker.com/id/1007261
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CVE Reference:
CVE-2003-0252
(Links to External Site)
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Date: Jul 22 2003
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Impact:
Denial of service via network, Execution of arbitrary code via network, User access via network
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Fix Available: Yes Vendor Confirmed: Yes
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Version(s): 1.0.3 and prior versions
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Description:
An off-by one buffer overflow vulnerability was reported in 'nfs-utils'. A remote user may be able to execute arbitrary code on the target system.
Janusz Niewiadomski of iSEC Security Research reported that a remote user can send a specially crafted request to the rpc.mountd daemon to trigger an overflow in the xlog() logging function. If the user-supplied string is 1023 bytes or longer, the trailing null '\0' byte is written beyond the end of the buffer.
According to the report, a remote user can cause the daemon to crash or execute arbitrary code with the privileges of the daemon. However, Red Hat reported in advisory RHSA-2003:206-01 that "it is not believed that this bug could lead to remote arbitrary code execution."
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Impact:
A remote user can send a specially crafted NFS request to cause the rpc.mountd daemon to crash or execute arbitrary code. The arbitrary code will run with the privileges of the daemon.
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Solution:
Conectiva has released a fix:
ftp://atualizacoes.conectiva.com.br/7.0/SRPMS/nfs-utils-0.3.1-6U70_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/nfs-utils-0.3.1-6U70_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/SRPMS/nfs-utils-0.3.1-6U80_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/nfs-utils-0.3.1-6U80_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/SRPMS/nfs-utils-1.0.1-17482U90_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/nfs-utils-1.0.1-17482U90_1cl.i386.rpm
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Vendor URL: sourceforge.net/projects/nfs/ (Links to External Site)
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Cause:
Boundary 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: Tue, 22 Jul 2003 10:18:36 -0300
Subject: [conectiva-updates] [CLA-2003:700] Conectiva Security Announcement - nfs-utils
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-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
- --------------------------------------------------------------------------
CONECTIVA LINUX SECURITY ANNOUNCEMENT
- --------------------------------------------------------------------------
PACKAGE : nfs-utils
SUMMARY : Buffer overflow vulnerability
DATE : 2003-07-22 10:17:00
ID : CLA-2003:700
RELEVANT
RELEASES : 7.0, 8, 9
- -------------------------------------------------------------------------
DESCRIPTION
The nfs-utils[1] package provides the utilities for Linux NFS client
and server.
Janusz Niewiadomski found[2] a buffer overflow vulnerability[3] in
the nfs-utils package that could be used by remote attackers to cause
a denial of service condition or execute arbitrary code with
administrator privileges.
To fix this issue, the author has released[4] a new version. The
packages made available through this update contain the same fix as
the one applied to this new version, 1.0.4.
SOLUTION
It is recommended that all nfs-utils users upgrade their packages.
IMPORTANT: after the upgrade, the nfs and nfs-lock services have to
be restarted if they were already running. To do this, run the
following commands as root:
/sbin/service nfs restart
/sbin/service nfslock restart
UPDATED PACKAGES
ftp://atualizacoes.conectiva.com.br/7.0/SRPMS/nfs-utils-0.3.1-6U70_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/nfs-utils-0.3.1-6U70_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/SRPMS/nfs-utils-0.3.1-6U80_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/nfs-utils-0.3.1-6U80_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/SRPMS/nfs-utils-1.0.1-17482U90_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/nfs-utils-1.0.1-17482U90_1cl.i386.rpm
ADDITIONAL INSTRUCTIONS
The apt tool can be used to perform RPM packages upgrades:
- 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
- -------------------------------------------------------------------------
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
- -------------------------------------------------------------------------
Copyright (c) 2003 Conectiva Inc.
http://www.conectiva.com
- -------------------------------------------------------------------------
subscribe: conectiva-updates-subscribe@papaleguas.conectiva.com.br
unsubscribe: conectiva-updates-unsubscribe@papaleguas.conectiva.com.br
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