(Caldera Releases Fix) 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
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SecurityTracker Alert ID: 1001257 |
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SecurityTracker URL: http://securitytracker.com/id/1001257
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CVE Reference:
GENERIC-MAP-NOMATCH
(Links to External Site)
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Date: Apr 7 2001
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Impact:
Execution of arbitrary code via network, Root access via network
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Fix Available: Yes Vendor Confirmed: Yes
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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.
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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.
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Solution:
Caldera has released a fix for Caldera OpenLinux.
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Vendor URL: www.calderasystems.com/support/security/index.html (Links to External Site)
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Cause:
Boundary error
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Underlying OS:
Linux (Any), UNIX (Any)
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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 Apr 2001 16:55:03 -0600
Subject: Security Update remote root exploit in ntpd CSSA-2001-013.0
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-----BEGIN PGP SIGNED MESSAGE-----
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______________________________________________________________________________
Caldera Systems, Inc. Security Advisory
Subject: remote root exploit in ntpd
Advisory number: CSSA-2001-013.0
Issue date: 2001 April, 6
Cross reference:
______________________________________________________________________________
1. Problem Description
The ntp time synchronisation demon has a buffer overflow in its
control request parsing which allows any remote attacker to gain
root access, if the demon is running.
Caldera Systems is shipping this demon disabled by default, but
we urge our customers to either deinstall or upgrade the package.
2. Vulnerable Versions
System Package
-----------------------------------------------------------
OpenLinux 2.3 All packages previous to
xntp-3.5.93e-5
OpenLinux eServer 2.3.1 All packages previous to
and OpenLinux eBuilder xntp-3.5.93e-5
OpenLinux eDesktop 2.4 All packages previous to
xntp-4.0.97-2
3. Solution
Workaround
Stop the demon and deinstall the xntp package by using:
/etc/rc.d/init.d/ntp stop
rpm -e xntp
The proper solution is to upgrade to the latest packages.
4. OpenLinux 2.3
4.1 Location of Fixed Packages
The upgrade packages can be found on Caldera's FTP site at:
ftp://ftp.calderasystems.com/pub/updates/OpenLinux/2.3/current/RPMS/
The corresponding source code package can be found at:
ftp://ftp.calderasystems.com/pub/updates/OpenLinux/2.3/current/SRPMS
4.2 Verification
19e51b89951b435061450398e764b753 RPMS/xntp-3.5.93e-5.i386.rpm
08a990b5034679c0a37ebbe20e162d05 SRPMS/xntp-3.5.93e-5.src.rpm
4.3 Installing Fixed Packages
Upgrade the affected packages with the following commands:
rpm -Fhv xntp-*.i386.rpm
5. OpenLinux eServer 2.3.1 and OpenLinux eBuilder for ECential 3.0
5.1 Location of Fixed Packages
The upgrade packages can be found on Caldera's FTP site at:
ftp://ftp.calderasystems.com/pub/updates/eServer/2.3/current/RPMS/
The corresponding source code package can be found at:
ftp://ftp.calderasystems.com/pub/updates/eServer/2.3/current/SRPMS
5.2 Verification
df892fae73626a11107552d7d1a68e6e RPMS/xntp-3.5.93e-5.i386.rpm
663eb55d629cdcc0212583e92be15d11 SRPMS/xntp-3.5.93e-5.src.rpm
5.3 Installing Fixed Packages
Upgrade the affected packages with the following commands:
rpm -Fvh xntp-*i386.rpm
6. OpenLinux eDesktop 2.4
6.1 Location of Fixed Packages
The upgrade packages can be found on Caldera's FTP site at:
ftp://ftp.calderasystems.com/pub/updates/eDesktop/2.4/current/RPMS/
The corresponding source code package can be found at:
ftp://ftp.calderasystems.com/pub/updates/eDesktop/2.4/current/SRPMS
6.2 Verification
fe7cffdf379ee9b69890f9fa9ff0f320 RPMS/xntp-4.0.97-2.i386.rpm
ff34841b2f01a252e6e31cb91ffcada5 SRPMS/xntp-4.0.97-2.src.rpm
6.3 Installing Fixed Packages
Upgrade the affected packages with the following commands:
rpm -Fvh xntp-*i386.rpm
7. References
This and other Caldera security resources are located at:
http://www.calderasystems.com/support/security/index.html
This security fix closes Caldera's internal Problem Report 9744.
8. Disclaimer
Caldera Systems, Inc. is not responsible for the misuse of any of the
information we provide on this website and/or through our security
advisories. Our advisories are a service to our customers intended to
promote secure installation and use of Caldera OpenLinux.
______________________________________________________________________________
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