ntpd 4.2.8 logconfig Command input validation

CVSS Meta Temp Score
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CTI Interest Score
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7.0$0-$5k0.00

A vulnerability was found in ntpd 4.2.8 (Network Management Software). It has been declared as critical. Affected by this vulnerability is an unknown code block of the component logconfig Command Handler. The manipulation with an unknown input leads to a input validation vulnerability. The CWE definition for the vulnerability is CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. As an impact it is known to affect availability. The summary by CVE is:

The log_config_command function in ntp_parser.y in ntpd in NTP before 4.2.7p42 allows remote attackers to cause a denial of service (ntpd crash) via crafted logconfig commands.

The weakness was disclosed 10/22/2015 by Miroslav Lichv as cisco-sa-20151021-ntp as confirmed advisory (Website). The advisory is shared at tools.cisco.com. This vulnerability is known as CVE-2015-5194 since 07/01/2015. The exploitation appears to be easy. The attack can be launched remotely. The requirement for exploitation is a single authentication. Neither technical details nor an exploit are publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 85751 (Amazon Linux AMI : ntp (ALAS-2015-593)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Amazon Linux Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 157189 (Oracle Enterprise Linux Security Update for ntp (ELSA-2016-0780)).

Upgrading to version 4.2.8p4 eliminates this vulnerability. A possible mitigation has been published before and not just after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at X-Force (107595), Tenable (85751), SecurityFocus (BID 76475†) and Vulnerability Center (SBV-57836†). Additional details are provided at bugzilla.redhat.com.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

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CVSSv3info

VulDB Meta Base Score: 7.5
VulDB Meta Temp Score: 7.0

VulDB Base Score: 7.5
VulDB Temp Score: 6.5
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
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Exploitinginfo

Class: Input validation
CWE: CWE-20
CAPEC: 🔍
ATT&CK: 🔍

Local: No
Remote: Yes

Availability: 🔍
Status: Unproven

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 85751
Nessus Name: Amazon Linux AMI : ntp (ALAS-2015-593)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 14611
OpenVAS Name: Amazon Linux Local Check: ALAS-2015-593
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: ntpd 4.2.8p4
Patch: github.com

Timelineinfo

07/01/2015 🔍
08/25/2015 +55 days 🔍
08/25/2015 +0 days 🔍
09/02/2015 +8 days 🔍
09/03/2015 +1 days 🔍
10/22/2015 +49 days 🔍
10/29/2015 +7 days 🔍
03/31/2016 +154 days 🔍
07/21/2017 +477 days 🔍
06/25/2022 +1800 days 🔍

Sourcesinfo

Advisory: cisco-sa-20151021-ntp
Researcher: Miroslav Lichv
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2015-5194 (🔍)
OVAL: 🔍

X-Force: 107595 - Network Time Protocol logconfig denial of service
SecurityFocus: 76475 - NTP CVE-2015-5194 Denial of Service Vulnerability
Vulnerability Center: 57836 - F5 Multiple Big-IP and Big-IQ Products Remote DoS of ntpd via a logconfig Command, Low

Misc.: 🔍

Entryinfo

Created: 10/29/2015 09:42 AM
Updated: 06/25/2022 12:37 PM
Changes: 10/29/2015 09:42 AM (79), 02/03/2019 10:24 AM (13), 06/25/2022 12:37 PM (4)
Complete: 🔍
Cache ID: 3:576:40

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