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Category:   Application (Generic)  >   Ntpd Vendors:   Mills, David L. et al
(Linux Mandrake Fix Available) Re: The Network Time Protocol Daemon (ntpd) Allows Remote Users to Execute Arbitrary Code on the Server - Typically to Gain Root Privileges on the Server
SecurityTracker Alert ID:  1001249
SecurityTracker URL:  http://securitytracker.com/id/1001249
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Apr 6 2001
Impact:   Execution of arbitrary code via network, Root access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   The Network Time Protocol Daemon (ntpd) shipped with many UNIX/Linux systems is reportedly vulnerable to a remote buffer overflow attack that allows remote users to execute arbitrary code on the server (potentially resulting in super-user access).

The buffer overflow occurs when the daemon is building a response to a remote user's query that contains an overly large readvar argument. Because ntpd typically runs with root-level privileges, this can allow remote attackers to gain root access to the timeserver.

When exploited, the destination buffer is reportedly damaged by the attack, so any arbitrary shell code must be limited to less than approximately 70 bytes.

Code for a demonstration exploit is contained in the source message.
Impact:   A remote user can cause arbitrary code supplied by the remote user to be executed on the target ntpd timeserver. Because ntpd typically runs with root-level privileges, this can result in remote root access being granted to the attacker. Because NTP is based on UDP, spoofing is possible, making protection against attacks more difficult.
Solution:   Linux Mandrake has released a fix.
Vendor URL:  www.linux-mandrake.com/ (Links to External Site)
Cause:   Boundary error
Underlying OS:   Linux (Mandriva/Mandrake)

Message History:   This archive entry is a follow-up to the message listed below.
Apr 5 2001 The Network Time Protocol Daemon (ntpd) Allows Remote Users to Execute Arbitrary Code on the Server - Typically to Gain Root Privileges on the Server


 Source Message Contents
Date:  Fri, 6 Apr 2001 09:31:25 -0600
Subject:  MDKSA-2001:036 - ntp/xntp3 update


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

________________________________________________________________________

                Linux-Mandrake Security Update Advisory
________________________________________________________________________

Package name:           ntp/xntp3
Date:                   April 6th, 2001
Advisory ID:            MDKSA-2001:036

Affected versions:      6.0, 6.1, 7.0, 7.1, 7.2, Corporate Server 1.0.1
________________________________________________________________________

Problem Description:

 Przemyslaw Frasunek <venglin@FREEBSD.LUBLIN.PL> reported that ntp
 daemons such as ntp and xntp3 are vulnerable to a buffer overflow that
 can lead to a remote root exploit.  Linux-Mandrake users are urged to
 upgrade ntp and xntp3 immediately.
________________________________________________________________________

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 Linux-Mandrake 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 6.0:
962038bacbddbeb3b6fd60437d9e0a16  6.0/RPMS/xntp3-5.93-9.4mdk.i586.rpm
59535e0387f876e8359c2e6006aee412  6.0/SRPMS/xntp3-5.93-9.4mdk.src.rpm

Linux-Mandrake 6.1:
e3290d013fdad5655fa00fe2671ead77  6.1/RPMS/xntp3-5.93-9.4mdk.i586.rpm
59535e0387f876e8359c2e6006aee412  6.1/SRPMS/xntp3-5.93-9.4mdk.src.rpm

Linux-Mandrake 7.0:
10d5665e96d4732fb50afac597b55b49  7.0/RPMS/xntp3-5.93-9.3mdk.i586.rpm
afb2de97e04dae55d0d28d5733db4352  7.0/SRPMS/xntp3-5.93-9.3mdk.src.rpm

Linux-Mandrake 7.1:
b838be30d640e9ec66a889ae40befcec  7.1/RPMS/ntp-4.0.99k-3.1mdk.i586.rpm
426adc36d33cca4bc79b42d2e27bdf90  7.1/RPMS/xntp3-5.93-9.2mdk.i586.rpm
fdde309e6374143810423b01c58734f0  7.1/SRPMS/ntp-4.0.99k-3.1mdk.src.rpm
0169a707d04905c11c797f80158d019a  7.1/SRPMS/xntp3-5.93-9.2mdk.src.rpm

Linux-Mandrake 7.2:
78510269b88b75b90fbb28cb5ecd7d0b  7.2/RPMS/ntp-4.0.99k-3.1mdk.i586.rpm
d1be8a263979dfcc9549aa0193b3bc43  7.2/RPMS/xntp3-5.93-9.1mdk.i586.rpm
fdde309e6374143810423b01c58734f0  7.2/SRPMS/ntp-4.0.99k-3.1mdk.src.rpm
ed9ff666ed28bbf050558cbb6d824dbf  7.2/SRPMS/xntp3-5.93-9.1mdk.src.rpm

Corporate Server 1.0.1:
b838be30d640e9ec66a889ae40befcec  1.0.1/RPMS/ntp-4.0.99k-3.1mdk.i586.rpm
426adc36d33cca4bc79b42d2e27bdf90  1.0.1/RPMS/xntp3-5.93-9.2mdk.i586.rpm
fdde309e6374143810423b01c58734f0  1.0.1/SRPMS/ntp-4.0.99k-3.1mdk.src.rpm
0169a707d04905c11c797f80158d019a  1.0.1/SRPMS/xntp3-5.93-9.2mdk.src.rpm
________________________________________________________________________

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
Linux-Mandrake 7.2, look for it in "updates/7.2/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 Linux-Mandrake at:

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

If you want to report vulnerabilities, please contact

  security@linux-mandrake.com
________________________________________________________________________

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

security-announce@linux-mandrake.com

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

security-discuss@linux-mandrake.com

  Linux-Mandrake's security discussion mailing list.  This list is open
  to anyone to discuss Linux-Mandrake 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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