ntpd 4.2.8 ntp_crypto.c Extension Field input validation

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
6.0$0-$5k0.00

Summaryinfo

A vulnerability identified as problematic has been detected in ntpd 4.2.8. This impacts an unknown function of the file ntp_crypto.c. The manipulation as part of Extension Field leads to input validation. This vulnerability is uniquely identified as CVE-2015-7691. No exploit exists. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in ntpd 4.2.8 (Network Management Software). It has been rated as problematic. This issue affects some unknown functionality of the file ntp_crypto.c. The manipulation as part of a Extension Field leads to a input validation vulnerability. Using CWE to declare the problem leads to 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. Impacted is availability.

The weakness was disclosed 10/21/2015 with Tenable as cisco-sa-20151021-ntp as confirmed advisory (Website). The advisory is shared at tools.cisco.com. The identification of this vulnerability is CVE-2015-7691 since 10/04/2015. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 88055 (AIX 6.1 TL 9 : ntp (IV79942) (deprecated)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family AIX Local Security Checks. The commercial vulnerability scanner Qualys is able to test this issue with plugin 38684 (Network Time Protocol Multiple Security Vulnerabilities (ntp-4.2.8p4)).

Upgrading to version 4.2.8p4 eliminates this vulnerability. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at X-Force (107449), Tenable (88055), SecurityFocus (BID 77274†) and Vulnerability Center (SBV-53936†). bugzilla.redhat.com is providing further details. The entries VDB-78844, VDB-78845, VDB-78846 and VDB-78847 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: 6.0

VulDB Base Score: 5.3
VulDB Temp Score: 4.6
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock

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

NVD Base Score: 🔍

Exploitinginfo

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

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Unproven

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

Nessus ID: 88055
Nessus Name: AIX 6.1 TL 9 : ntp (IV79942) (deprecated)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍

OpenVAS ID: 14611
OpenVAS Name: Amazon Linux Local Check: alas-2015-607
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Upgrade: ntpd 4.2.8p4
McAfee IPS: 🔍
McAfee IPS Version: 🔍

Timelineinfo

10/04/2015 🔍
10/21/2015 +17 days 🔍
10/21/2015 +0 days 🔍
10/21/2015 +0 days 🔍
10/21/2015 +0 days 🔍
10/23/2015 +2 days 🔍
10/23/2015 +0 days 🔍
08/07/2017 +654 days 🔍
06/25/2022 +1782 days 🔍

Sourcesinfo

Advisory: cisco-sa-20151021-ntp
Organization: Tenable
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2015-7691 (🔍)
GCVE (CVE): GCVE-0-2015-7691
GCVE (VulDB): GCVE-100-78857

OVAL: 🔍

X-Force: 107449 - Network Time Protocol autokey denial of service
SecurityFocus: 77274 - NTP CVE-2015-7691 Incomplete Fix Denial of Service Vulnerability
SecurityTracker: 1033951
Vulnerability Center: 53936 - NTP before 4.2.8p4 Remote DoS Vulnerability in ntp_crypto.c - CVE-2015-7691, Medium

Misc.: 🔍
See also: 🔍

Entryinfo

Created: 10/23/2015 10:06
Updated: 06/25/2022 01:50
Changes: 10/23/2015 10:06 (86), 02/19/2018 09:31 (6), 06/25/2022 01:43 (5), 06/25/2022 01:50 (1)
Complete: 🔍
Cache ID: 216:FCD:103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Want to stay up to date on a daily basis?

Enable the mail alert feature now!