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Category:   Application (Generic)  >   Xinetd Vendors:   Red Hat
(Mandrake 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
SecurityTracker Alert ID:  1001935
SecurityTracker URL:  http://securitytracker.com/id/1001935
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Jul 6 2001
Impact:   Execution of arbitrary code via network, Modification of system information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to 2.1.8.9pre15-2
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).
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.
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.
Vendor URL:  www.redhat.com/ (Links to External Site)
Cause:   Access control error
Underlying OS:   Linux (Mandriva/Mandrake)

Message History:   This archive entry is a follow-up to the message listed below.
Jun 6 2001 RedHat's Xinetd Networking Daemon Package May Allow Remote Users to Execute Arbitrary Code as Root and Allow Local Users to Modify System Files


 Source Message Contents
Date:  Thu, 5 Jul 2001 20:04:51 +0000
Subject:  [Security Announce] MDKSA-2001:055-1 - xinetd update


-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

________________________________________________________________________

                Mandrake Linux Security Update Advisory
________________________________________________________________________

Package name:           xinetd
Date:                   July 5th, 2001
Original Advisory Date: June 11th, 2001
Advisory ID:            MDKSA-2001:055-1

Affected versions:      7.2, 8.0, Single Network Firewall 7.2
________________________________________________________________________

Problem Description:

 A bug exists in xinetd as shipped with Mandrake Linux 8.0 dealing with
 TCP connections with the WAIT state that prevents linuxconf-web from
 working properly.  As well, xinetd contains a security flaw in which
 it defaults to a umask of 0.  This means that applications using the
 xinetd umask that do not set permissions themselves (like SWAT, a web
 configuration tool for Samba), will create world writable files.  This
 update sets the default umask to 022.

Update:

 This update forces the TMPDIR to /tmp instead of obtaining it from the
 root user by default, which uses /root/tmp.  As well, this version of
 xinetd also fixed a possible buffer overflow in the logging code that
 was reported by zen-parse on bugtraq, but was not mentioned in the
 previous advisory.
________________________________________________________________________

References:

 http://www.securityfocus.com/bid/2826
 http://www.securityfocus.com/bid/2840
________________________________________________________________________

Please verify the update prior to upgrading to ensure the integrity of
the downloaded package.  You can do this with the command:
  rpm --checksig package.rpm
You can get the GPG public key of the Mandrake Linux Security Team at
  http://www.linux-mandrake.com/en/security/RPM-GPG-KEYS
If you use MandrakeUpdate, the verification of md5 checksum and GPG
signature is performed automatically for you.

Linux-Mandrake 7.2:
681f8a35afdaea2781d4fc32d93993ab  7.2/RPMS/xinetd-2.3.0-1.2mdk.i586.rpm
1b3650c4d3bf4f110a795639fbf4000b  7.2/SRPMS/xinetd-2.3.0-1.2mdk.src.rpm

Mandrake Linux 8.0:
d9e1bdc5a29712a75608c4753f6d6490  8.0/RPMS/xinetd-2.3.0-1.1mdk.i586.rpm
9f95def40b777f13fc8339bf321b9547  8.0/RPMS/xinetd-ipv6-2.3.0-1.1mdk.i586.rpm
5820ae84905e550320601fe422a9a1b4  8.0/SRPMS/xinetd-2.3.0-1.1mdk.src.rpm

Single Network Firewall 7.2:
681f8a35afdaea2781d4fc32d93993ab  snf7.2/RPMS/xinetd-2.3.0-1.2mdk.i586.rpm
1b3650c4d3bf4f110a795639fbf4000b  snf7.2/SRPMS/xinetd-2.3.0-1.2mdk.src.rpm
________________________________________________________________________

Bug IDs fixed (see https://qa.mandrakesoft.com for more information):

3610 - linuxconf denial of service
________________________________________________________________________

To upgrade automatically, use MandrakeUpdate.

If you want to upgrade manually, download the updated package from one
of our FTP server mirrors and upgrade with "rpm -Fvh *.rpm".

You can download the updates directly from one of the mirror sites
listed at:

  http://www.linux-mandrake.com/en/ftp.php3.

Updated packages are available in the "updates/[ver]/RPMS/" directory.
For example, if you are looking for an updated RPM package for
Mandrake Linux 8.0, look for it in "updates/8.0/RPMS/".  Updated source
RPMs are available as well, but you generally do not need to download
them.

Please be aware that sometimes it takes the mirrors a few hours to
update.

You can view other security advisories for Mandrake Linux at:

  http://www.linux-mandrake.com/en/security/

If you want to report vulnerabilities, please contact

  security@linux-mandrake.com
________________________________________________________________________

Mandrake Linux has two security-related mailing list services that
anyone can subscribe to:

security-announce@linux-mandrake.com

  Mandrake Linux's security announcements mailing list.  Only
  announcements are sent to this list and it is read-only.

security-discuss@linux-mandrake.com

  Mandrake Linux's security discussion mailing list.  This list is open
  to anyone to discuss Mandrake Linux security specifically and Linux
  security in general.

To subscribe to either list, send a message to
  sympa@linux-mandrake.com
with "subscribe [listname]" in the body of the message.

To remove yourself from either list, send a message to
  sympa@linux-mandrake.com
with "unsubscribe [listname]" in the body of the message.

To get more information on either list, send a message to
  sympa@linux-mandrake.com
with "info [listname]" in the body of the message.

Optionally, you can use the web interface to subscribe to or unsubscribe
from either list:

  http://www.linux-mandrake.com/en/flists.php3#security
________________________________________________________________________

Type Bits/KeyID     Date       User ID
pub  1024D/22458A98 2000-07-10 Linux Mandrake Security Team
  <security@linux-mandrake.com>


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