Executive Summary
Informations | |||
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Name | TA14-013A | First vendor Publication | 2014-01-13 |
Vendor | US-CERT | Last vendor Modification | 2014-01-14 |
Severity (Vendor) | N/A | Revision | N/A |
Security-Database Scoring CVSS v3
Cvss vector : N/A | |||
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Overall CVSS Score | NA | ||
Base Score | NA | Environmental Score | NA |
impact SubScore | NA | Temporal Score | NA |
Exploitabality Sub Score | NA | ||
Calculate full CVSS 3.0 Vectors scores |
Security-Database Scoring CVSS v2
Cvss vector : (AV:N/AC:L/Au:N/C:N/I:N/A:P) | |||
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Cvss Base Score | 5 | Attack Range | Network |
Cvss Impact Score | 2.9 | Attack Complexity | Low |
Cvss Expoit Score | 10 | Authentication | None Required |
Calculate full CVSS 2.0 Vectors scores |
Detail
Overview A Network Time Protocol (NTP) Amplification attack is an emerging form of Distributed Denial of Service (DDoS) that relies on the use of publically accessible NTP servers to overwhelm a victim system with UDP traffic. DescriptionThe NTP service supports a monitoring service that allows administrators to query the server for traffic counts of connected clients. This information is provided via the “monlist” command. The basic attack technique consists of an attacker sending a "get monlist" request to a vulnerable NTP server, with the source address spoofed to be the victim’s address. ImpactThe attack relies on the exploitation of the 'monlist' feature of NTP, as described in CVE-2013-5211, which is enabled by default on older NTP-capable devices. This command causes a list of the last 600 IP addresses which connected to the NTP server to be sent to the victim. Due to the spoofed source address, when the NTP server sends the response it is sent instead to the victim. Because the size of the response is typically considerably larger than the request, the attacker is able to amplify the volume of traffic directed at the victim. Additionally, because the responses are legitimate data coming from valid servers, it is especially difficult to block these types of attacks. The solution is to disable “monlist” within the NTP server or to upgrade to the latest version of NTP (4.2.7) which disables the “monlist” functionality. SolutionDetection On a UNIX-platform, the command “ntpdc” will query existing NTP servers for monitoring data. If the system is vulnerable to exploitation, it will respond to the “monlist” command in interactive mode. By default, most modern UNIX and Linux distributions allow this command to be used from localhost, but not from a remote host. To test for monlist support, execute the following command at the command line: /usr/sbin/ntpdc <remote server> monlist Additionally, the “ntp-monlist” script is available for NMap, which will automatically display the results of the monlist command. If the system does not support the monitor query, and is therefore not vulnerable to this attack type, NMap will return an error type 4 (No Data Available) or no reply at all.
Recommended Course of Action As all versions of ntpd prior to 4.2.7 are vulnerable by default, the simplest recommended course of action is to upgrade all versions of ntpd that are publically accessible to at least 4.2.7. However, in cases where it is not possible to upgrade the version of the service, it is possible to disable the monitor functionality in earlier versions of the software. To disable “monlist” functionality on a public-facing NTP server that cannot be updated to 4.2.7, add the “noquery” directive to the “restrict default” line in the system’s ntp.conf, as shown below: restrict default kod nomodify notrap nopeer noquery restrict -6 default kod nomodify notrap nopeer noquery |
Original Source
Url : http://www.us-cert.gov/cas/techalerts/TA14-013A.html |
CWE : Common Weakness Enumeration
% | Id | Name |
---|---|---|
100 % | CWE-20 | Improper Input Validation |
OVAL Definitions
Definition Id: oval:org.mitre.oval:def:24449 | |||
Oval ID: | oval:org.mitre.oval:def:24449 | ||
Title: | Network Time Protocol (NTP) vulnerability in AIX | ||
Description: | The monlist feature in ntp_request.c in ntpd in NTP before 4.2.7p26 allows remote attackers to cause a denial of service (traffic amplification) via forged (1) REQ_MON_GETLIST or (2) REQ_MON_GETLIST_1 requests, as exploited in the wild in December 2013. | ||
Family: | unix | Class: | vulnerability |
Reference(s): | CVE-2013-5211 | Version: | 6 |
Platform(s): | IBM AIX 6.1 IBM AIX 7.1 | Product(s): | |
Definition Synopsis: | |||
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Definition Id: oval:org.mitre.oval:def:26210 | |||
Oval ID: | oval:org.mitre.oval:def:26210 | ||
Title: | SUSE-SU-2014:0937-1 -- Security update for ntp | ||
Description: | The NTP time service could have been used for remote denial of service amplification attacks. | ||
Family: | unix | Class: | patch |
Reference(s): | SUSE-SU-2014:0937-1 CVE-2013-5211 | Version: | 3 |
Platform(s): | SUSE Linux Enterprise Server 11 SUSE Linux Enterprise Desktop 11 | Product(s): | ntp |
Definition Synopsis: | |||
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CPE : Common Platform Enumeration
ExploitDB Exploits
id | Description |
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2014-04-28 | NTP ntpd monlist Query Reflection - Denial of Service |
Snort® IPS/IDS
Date | Description |
---|---|
2018-05-23 | SSDP M-SEARCH ssdp-all potential amplified distributed denial-of-service attempt RuleID : 45157-community - Revision : 4 - Type : SERVER-OTHER |
2018-01-11 | SSDP M-SEARCH ssdp-all potential amplified distributed denial-of-service attempt RuleID : 45157 - Revision : 4 - Type : SERVER-OTHER |
2015-05-19 | NTP mode 6 UNSETTRAP denial of service attempt RuleID : 34114 - Revision : 4 - Type : SERVER-OTHER |
2015-05-19 | NTP mode 6 REQ_NONCE denial of service attempt RuleID : 34112 - Revision : 4 - Type : SERVER-OTHER |
2014-02-15 | ntp monlist denial of service attempt RuleID : 29393 - Revision : 6 - Type : SERVER-OTHER |
Nessus® Vulnerability Scanner
Date | Description |
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2017-10-27 | Name : The remote OracleVM host is missing one or more security updates. File : oraclevm_OVMSA-2017-0165.nasl - Type : ACT_GATHER_INFO |
2017-02-08 | Name : The remote OracleVM host is missing one or more security updates. File : oraclevm_OVMSA-2017-0038.nasl - Type : ACT_GATHER_INFO |
2016-09-13 | Name : The remote Oracle Linux host is missing one or more security updates. File : oraclelinux_ELSA-2016-3613.nasl - Type : ACT_GATHER_INFO |
2016-09-13 | Name : The remote Oracle Linux host is missing one or more security updates. File : oraclelinux_ELSA-2016-3612.nasl - Type : ACT_GATHER_INFO |
2015-12-30 | Name : The remote VMware ESX / ESXi host is missing a security-related patch. File : vmware_VMSA-2014-0002_remote.nasl - Type : ACT_GATHER_INFO |
2015-05-22 | Name : The remote VMware ESXi 5.5 host is affected by multiple vulnerabilities. File : vmware_esxi_5_5_build_1623387_remote.nasl - Type : ACT_GATHER_INFO |
2015-01-29 | Name : The remote VMware ESXi 5.1 host is affected by multiple vulnerabilities. File : vmware_esxi_5_1_build_1743201_remote.nasl - Type : ACT_GATHER_INFO |
2015-01-29 | Name : The remote VMware ESXi 5.0 host is affected by multiple vulnerabilities. File : vmware_esxi_5_0_build_1749766_remote.nasl - Type : ACT_GATHER_INFO |
2015-01-19 | Name : The remote Solaris system is missing a security patch for third-party software. File : solaris11_ntp_20140417.nasl - Type : ACT_GATHER_INFO |
2014-09-19 | Name : The remote device is missing a vendor-supplied security patch. File : juniper_jsa10613.nasl - Type : ACT_GATHER_INFO |
2014-08-01 | Name : The remote openSUSE host is missing a security update. File : openSUSE-2014-474.nasl - Type : ACT_GATHER_INFO |
2014-07-31 | Name : The remote openSUSE host is missing a security update. File : suse_12_3_openSUSE-2014--140722.nasl - Type : ACT_GATHER_INFO |
2014-07-31 | Name : The remote openSUSE host is missing a security update. File : suse_13_1_openSUSE-2014--140722.nasl - Type : ACT_GATHER_INFO |
2014-07-30 | Name : The remote SuSE 11 host is missing one or more security updates. File : suse_11_ntp-140721.nasl - Type : ACT_GATHER_INFO |
2014-06-17 | Name : The remote AIX host is missing a security patch. File : aix_IV59636.nasl - Type : ACT_GATHER_INFO |
2014-06-17 | Name : The remote AIX host is missing a security patch. File : aix_IV58413.nasl - Type : ACT_GATHER_INFO |
2014-06-17 | Name : The remote AIX host is missing a security patch. File : aix_IV58068.nasl - Type : ACT_GATHER_INFO |
2014-06-17 | Name : The remote AIX host is missing a security patch. File : aix_IV56575.nasl - Type : ACT_GATHER_INFO |
2014-06-17 | Name : The remote AIX host is missing a security patch. File : aix_IV56324.nasl - Type : ACT_GATHER_INFO |
2014-06-17 | Name : The remote AIX host is missing a security patch. File : aix_IV56213.nasl - Type : ACT_GATHER_INFO |
2014-06-17 | Name : The remote AIX host is missing a security patch. File : aix_IV55365.nasl - Type : ACT_GATHER_INFO |
2014-03-12 | Name : The remote VMware ESXi / ESX host is missing one or more security-related pat... File : vmware_VMSA-2014-0002.nasl - Type : ACT_GATHER_INFO |
2014-02-14 | Name : The remote Slackware host is missing a security update. File : Slackware_SSA_2014-044-02.nasl - Type : ACT_GATHER_INFO |
2014-01-20 | Name : The remote Gentoo host is missing one or more security-related patches. File : gentoo_GLSA-201401-08.nasl - Type : ACT_GATHER_INFO |
2014-01-15 | Name : The remote FreeBSD host is missing a security-related update. File : freebsd_pkg_3d95c9a77d5c11e3a8c1206a8a720317.nasl - Type : ACT_GATHER_INFO |
2014-01-02 | Name : The remote NTP server is affected by a denial of service vulnerability. File : ntp_monlist_enabled.nasl - Type : ACT_GATHER_INFO |
Alert History
Date | Informations |
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2014-03-06 13:30:16 |
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2014-01-14 17:18:19 |
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