ntpd up to 4.2.8p8 Rate Limit resource management

CVSS Meta Temp Score
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CTI Interest Score
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6.3$0-$5k0.00

Summaryinfo

A vulnerability was found in ntpd up to 4.2.8p8. It has been classified as problematic. This affects an unknown part of the component Rate Limit Handler. This manipulation causes resource management. This vulnerability is tracked as CVE-2016-7426. The attack is possible to be carried out remotely. No exploit exists. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in ntpd up to 4.2.8p8 (Network Management Software). It has been declared as problematic. Affected by this vulnerability is an unknown code block of the component Rate Limit Handler. The manipulation with an unknown input leads to a resource management vulnerability. The CWE definition for the vulnerability is CWE-399. As an impact it is known to affect availability. The summary by CVE is:

NTP before 4.2.8p9 rate limits responses received from the configured sources when rate limiting for all associations is enabled, which allows remote attackers to cause a denial of service (prevent responses from the sources) by sending responses with a spoofed source address.

The bug was discovered 11/21/2016. The weakness was disclosed 01/13/2017 by Miroslav Lichvar with Red Hat (Website). The advisory is shared at nwtime.org. This vulnerability is known as CVE-2016-7426 since 09/09/2016. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Neither technical details nor an exploit are publicly available.

The vulnerability was handled as a non-public zero-day exploit for at least 16 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 95616 (Fedora 23 : ntp (2016-e8a8561ee7)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Fedora Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 371402 (Cisco UCS 6200 Series Fabric Interconnects Multiple Vulnerabilities in Network Time Protocol Daemon (CSCvc23476)).

Upgrading to version 4.2.8p9 eliminates this vulnerability. A possible mitigation has been published even before and not after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (95616) and SecurityFocus (BID 94451†). The entries VDB-93745, VDB-95318, VDB-95319 and VDB-95320 are pretty similar. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.3

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Resource management
CWE: CWE-399 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 95616
Nessus Name: Fedora 23 : ntp (2016-e8a8561ee7)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 71151
OpenVAS Name: NTP.org ntp DoS Vulnerability
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: ntpd 4.2.8p9

Timelineinfo

09/09/2016 🔍
11/21/2016 +73 days 🔍
11/21/2016 +0 days 🔍
12/07/2016 +16 days 🔍
12/08/2016 +1 days 🔍
01/13/2017 +36 days 🔍
01/13/2017 +0 days 🔍
01/15/2017 +2 days 🔍
02/01/2025 +2939 days 🔍

Sourcesinfo

Advisory: FEDORA-2016-e8a8561ee7
Researcher: Miroslav Lichvar
Organization: Red Hat
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2016-7426 (🔍)
GCVE (CVE): GCVE-0-2016-7426
GCVE (VulDB): GCVE-100-95317

OVAL: 🔍

CERT: 🔍
SecurityFocus: 94451 - NTP CVE-2016-7426 Local Denial of Service Vulnerability
OSVDB: - CVE-2016-7426 - NTP - Denial of Service Issue
SecurityTracker: 1037354

See also: 🔍

Entryinfo

Created: 01/15/2017 10:37
Updated: 02/01/2025 18:59
Changes: 01/15/2017 10:37 (74), 08/19/2020 11:10 (9), 10/28/2022 15:58 (4), 10/28/2022 16:04 (1), 02/01/2025 18:59 (15)
Complete: 🔍
Cache ID: 216:F3C:103

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