NTP mode7 (MODE_PRIVATE) denial of service

ntp-mode7-dos (54650) The risk level is classified as MediumMedium Risk

Description:

NTP is vulnerable to a denial of service, caused by an error when processing mode 7 (MODE_PRIVATE) requests by the ntpdc query and control utility. By sending a sending a specially-crafted mode 7 response packet containing a spoofed source address, an attacker could trigger an endless loop, consuming available CPU resources.

*CVSS:

Base Score: 5
  Access Vector: Network
  Access Complexity: Low
  Authentication: None
  Confidentiality Impact: None
  Integrity Impact: None
  Availability Impact: Partial
 
Temporal Score: 3.7
  Exploitability: Unproven
  Remediation Level: Official-Fix
  Report Confidence: Confirmed

Consequences:

Denial of Service

Remedy:

Upgrade to the latest version of NTP (4.2.4p8 or later), available from the NTP Web site. See References.

For other distributions:
Apply the appropriate update for your system. See References.

References:

  • ASA-2010-024: A Security Vulnerability in the ntp Daemon (xntpd(1M)) May Lead to a Denial of the Solaris Network Time Protocol(NTP) Service (Sun 275590).
  • ASA-2010-024: A Security Vulnerability in the ntp Daemon (xntpd(1M)) May Lead to a Denial of the Solaris Network Time Protocol(NTP) Service (Sun 275590).
  • HP Security Bulletin HPSBOV02497 SSRT090245 rev.1: HP TCP/IP Services for OpenVMS Running NTP, Remote Execution of Arbitrary Code, Denial of Service (DoS).
  • HP Security Bulletin HPSBTU02496 SSRT090245: HP Tru64 UNIX Running NTP, Denial of Service (DoS).
  • IBM APAR IZ68659: NTP MODE 7 VULNERABILITY IN AIX 5.3 /AIX 6.1.
  • IBM APAR IZ71047: NTP MODE 7 VULNERABILITY IN AIX 5.3 /AIX 6.1.
  • Nortel Enterprise Response to VU#568372: Potential DoS using ntpd from xntp2.
  • NTP Bugzilla: DoS with mode 7 packets (CVE-2009-3563).
  • NTP Web site: NTP Software Downloads.
  • VMSA-2010-0009: ESXi utilities and ESX Service Console third party updates.
  • VMware Security Announcements: VMSA-2010-0004 ESX Service Console and vMA third party updates.
  • Vulnerability Note VU#568372: NTP mode 7 denial-of-service vulnerability.
  • BID-37255: NTP mode 7 MODE_PRIVATE Packet Remote Denial of Service Vulnerability
  • CVE-2009-3563: ntp_request.c in ntpd in NTP before 4.2.4p8, and 4.2.5, allows remote attackers to cause a denial of service (CPU and bandwidth consumption) by using MODE_PRIVATE to send a spoofed (1) request or (2) response packet that triggers a continuous exchange of MODE_PRIVATE error responses between two NTP daemons.
  • DSA-1948: ntp -- denial of service
  • DSA-1992: chrony -- several vulnerabilities
  • GLSA-201001-01: NTP: Denial of Service
  • MDVSA-2009:328: ntp
  • OSVDB ID: 60847: NTP ntpd Mode 7 Request Crafted Packet Reply Loop Remote DoS
  • OSVDB ID: 62141: Chrony chronyd cmdmon Packet Handling Remote DoS
  • RHSA-2009-1648: Moderate: ntp security update
  • RHSA-2009-1651: Moderate: ntp security update
  • SA37629: NTP Mode 7 Request Denial of Service
  • SA37871: Nortel CS1000 NTP Mode 7 Request Denial of Service
  • SA37922: Avaya Products Two Vulnerabilities
  • SA38009: Sun Solaris NTP Mode 7 Request Denial of Service
  • SA38038: F5 Products NTP Mode 7 Request Denial of Service
  • SA38421: Avaya CMS Solaris NTP Mode 7 Request Denial of Service
  • SA38764: IBM AIX NTP Mode 7 Request Denial of Service
  • SA38794: VMware vMA Update for Multiple Packages
  • SA38832: VMware ESX Server Multiple Vulnerabilities
  • SA38834: VMware ESX Server 4 Multiple Vulnerabilities
  • SA39066: HP TCP/IP Services for OpenVMS NTP Multiple Vulnerabilities
  • SA39920: VMware vMA kernel Multiple Vulnerabilities
  • SA39972: VMware ESXi ntp Mode 7 Request Denial of Service
  • SA39973: VMware ESX Multiple krb5 Vulnerabilities
  • SA39974: VMware ESX GCC libtool Search Path Privilege Escalation Security Issue
  • SA39975: VMware ESX gzip unlzw() Integer Underflow Vulnerability
  • SA39976: VMware vMA OpenSSL CRYPTO_free_all_ex_data() Memory Leak Vulnerability
  • SA39977: VMware vMA Multiple krb5 Vulnerabilities
  • SA39979: VMware vMA GCC libtool Search Path Privilege Escalation Security Issue
  • SA39980: VMware vMA gzip unlzw() Integer Underflow Vulnerability
  • SA39981: VMware vMA sudo Privilege Escalation Security Issues
  • SA41697: HP Tru64 UNIX NTP Mode 7 Request Denial of Service
  • SA43990: HP-UX XNTP Denial of Service Vulnerability
  • SA47257: Oracle Sun System Firmware Network Time Protocol Multiple Vulnerabilities
  • SECTRACK ID: 1023298: NTP Mode 7 Packet Processing Flaw Lets Remote Users Deny Service
  • SUSE-SR:2009:020: SUSE Security Summary Report
  • US-CERT VU#568372: NTP mode 7 denial-of-service vulnerability
  • USN-867-1: Ntp vulnerability

Platforms Affected:

  • Avaya CMS R14
  • Avaya CMS R14.1
  • Avaya CMS R15
  • Avaya CMS R16
  • Canonical Ubuntu 6.06 LTS
  • Canonical Ubuntu 8.04 LTS
  • Canonical Ubuntu 8.10
  • Debian Debian Linux 4.0
  • Debian Debian Linux 5.0
  • Gentoo Linux
  • HP TCP IP Services OpenVMS 5.5
  • HP TCP IP Services OpenVMS 5.6
  • HP Tru64 5.1B-4 (BL27)
  • HP Tru64 5.1B-5 (BL28)
  • IBM AIX 5.3
  • IBM AIX 6.1
  • MandrakeSoft Mandrake Linux 2008.0 X86_64
  • MandrakeSoft Mandrake Linux 2008.0
  • MandrakeSoft Mandrake Linux Corporate Server 3.0 X86_64
  • MandrakeSoft Mandrake Linux Corporate Server 3.0
  • MandrakeSoft Mandrake Linux Corporate Server 4.0
  • MandrakeSoft Mandrake Linux Corporate Server 4.0 X86_64
  • MandrakeSoft Mandrake Multi Network Firewall 2.0
  • Mandriva Enterprise Server 5
  • Mandriva Enterprise Server 5 X86_64
  • Mandriva Linux 2009.0
  • Mandriva Linux 2009.0 X86_64
  • Mandriva Linux 2009.1 X86_64
  • Mandriva Linux 2009.1
  • Mandriva Linux 2010
  • Mandriva Linux 2010 X86_64
  • Nortel CS1000 4.5
  • NTP NTP 4.2.4p7
  • Oracle Sun System Firmware 8.x
  • RedHat Enterprise Linux 3 ES
  • RedHat Enterprise Linux 3 Desktop
  • RedHat Enterprise Linux 3 WS
  • RedHat Enterprise Linux 3 AS
  • RedHat Enterprise Linux 4 Desktop
  • RedHat Enterprise Linux 4 ES
  • RedHat Enterprise Linux 4 AS
  • RedHat Enterprise Linux 4 WS
  • RedHat Enterprise Linux 4.8.z AS
  • RedHat Enterprise Linux 4.8.z ES
  • RedHat Enterprise Linux 5
  • RedHat Enterprise Linux 5 Client
  • RedHat Enterprise Linux 5.4.z EUS
  • VMware ESX Server 2.5.5
  • VMware ESX Server 3.0.3
  • VMware ESX Server 3.5
  • VMware ESX Server 4.0
  • VMware ESXi Server 4.0
  • VMware vMA 4.0

Reported:

Dec 08, 2009

The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall the author/distributor (IBM Internet Security Systems X-Force) be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.

For corrections or additions please email ignore thisxforceignore this@ignore thisus.ignore thisibm.comignore this

Return to the main page

* According to the Forum of Incident Response and Security Teams (FIRST), the Common Vulnerability Scoring System (CVSS) is an "industry open standard designed to convey vulnerability severity and help to determine urgency and priority of response." IBM PROVIDES THE CVSS SCORES "AS IS" WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY.
The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall IBM be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.

About IBM Security Systems

IBM Security Systems include an extensive portfolio of hardware, software solutions, professional and managed services offerings covering the spectrum of IT and business security risks: people and identity, data and information, application and process, network, server and endpoint and physical infrastructure, empowering clients to innovate and operate their businesses on the most secure infrastructure platforms. Through world-class solutions that address risk across the enterprise, IBM helps organizations build a strong security posture that helps reduce costs, improve service, and manage risk. IBM X-Force(R) Research and Development is one of the most renowned commercial security research and development groups in the world. For more information on how to address today's biggest risks, please visit us at ibm.com/security.