Ubuntu Linux 12.04/14.04/16.04 ntp Package crontab access control

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

Summaryinfo

A vulnerability classified as critical was found in Ubuntu Linux 12.04/14.04/16.04. The impacted element is an unknown function of the file crontab of the component ntp Package. The manipulation results in access control. This vulnerability is identified as CVE-2016-0727. The attack is only possible with local access. Additionally, an exploit exists. It is advisable to implement a patch to correct this issue.

Detailsinfo

A vulnerability, which was classified as critical, was found in Ubuntu Linux 12.04/14.04/16.04 (Operating System). Affected is an unknown function of the file crontab of the component ntp Package. The manipulation with an unknown input leads to a access control vulnerability. CWE is classifying the issue as CWE-264. This is going to have an impact on integrity, and availability. CVE summarizes:

The crontab script in the ntp package before 1:4.2.6.p3+dfsg-1ubuntu3.11 on Ubuntu 12.04 LTS, before 1:4.2.6.p5+dfsg-3ubuntu2.14.04.10 on Ubuntu 14.04 LTS, on Ubuntu Wily, and before 1:4.2.8p4+dfsg-3ubuntu5.3 on Ubuntu 16.04 LTS allows local users with access to the ntp account to write to arbitrary files and consequently gain privileges via vectors involving statistics directory cleanup.

The bug was discovered 01/26/2016. The weakness was released 04/14/2017 by halfdog (Website). The advisory is shared for download at ubuntu.com. This vulnerability is traded as CVE-2016-0727 since 12/16/2015. The attack needs to be approached locally. The exploitation doesn't require any form of authentication. Technical details and a public exploit are known. The MITRE ATT&CK project declares the attack technique as T1068.

The exploit is shared for download at exploit-db.com. It is declared as proof-of-concept. The vulnerability was handled as a non-public zero-day exploit for at least 253 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 93896 (Ubuntu 12.04 LTS / 14.04 LTS / 16.04 LTS : ntp vulnerabilities (USN-3096-1)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Ubuntu Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 196593 (Ubuntu Security Notification for Ntp Vulnerabilities (USN-3096-1)).

Applying a patch is able to eliminate this problem. 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 Exploit-DB (41764), Tenable (93896) and SecurityFocus (BID 81552†). Entries connected to this vulnerability are available at VDB-80646 and VDB-80647. Once again VulDB remains the best source for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.2

VulDB Base Score: 5.1
VulDB Temp Score: 4.6
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.8
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
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Exploitinginfo

Class: Access control
CWE: CWE-264
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Download: 🔍

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EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 93896
Nessus Name: Ubuntu 12.04 LTS / 14.04 LTS / 16.04 LTS : ntp vulnerabilities (USN-3096-1)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 841810
OpenVAS Name: Ubuntu Update for ntp USN-3096-1
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Exploit-DB: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍

Timelineinfo

12/16/2015 🔍
01/21/2016 +36 days 🔍
01/26/2016 +5 days 🔍
10/05/2016 +253 days 🔍
10/06/2016 +1 days 🔍
04/14/2017 +190 days 🔍
04/14/2017 +0 days 🔍
04/15/2017 +1 days 🔍
11/29/2024 +2785 days 🔍

Sourcesinfo

Vendor: ubuntu.com

Advisory: USN-3096-1
Researcher: halfdog
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2016-0727 (🔍)
GCVE (CVE): GCVE-0-2016-0727
GCVE (VulDB): GCVE-100-99876
SecurityFocus: 81552 - NTP Cronjob Script CVE-2016-0727 Local Privilege Escalation Vulnerability
OSVDB: - CVE-2016-0727 - Ubuntu - Privilege Escalation Issue
SecurityTracker: 1034808

scip Labs: https://www.scip.ch/en/?labs.20161013
See also: 🔍

Entryinfo

Created: 04/15/2017 15:24
Updated: 11/29/2024 13:32
Changes: 04/15/2017 15:24 (80), 08/31/2020 11:17 (3), 11/29/2022 13:24 (5), 11/29/2024 13:32 (24)
Complete: 🔍
Cache ID: 216::103

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