VDB-97951 · CVE-2017-5985 · BID 96777

Linux Containers lxc-user-nic lxc/lxc_user_nic.c access control

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.
4.2	$0-$5k	0.00

A vulnerability has been found in Linux Containers (Virtualization Software) (version unknown) and classified as problematic. Affected by this vulnerability is an unknown function of the file lxc/lxc_user_nic.c of the component lxc-user-nic. The manipulation with an unknown input leads to a access control vulnerability. The CWE definition for the vulnerability is CWE-264. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

lxc-user-nic in Linux Containers (LXC) allows local users with a lxc-usernet allocation to create network interfaces on the host and choose the name of those interfaces by leveraging lack of netns ownership check.

The bug was discovered 03/14/2017. The weakness was released 03/14/2017 by Jann Horn (Website). It is possible to read the advisory at lists.linuxcontainers.org. This vulnerability is known as CVE-2017-5985 since 02/13/2017. Attacking locally is a requirement. The successful exploitation requires a single authentication. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1068 according to MITRE ATT&CK.

The vulnerability scanner Nessus provides a plugin with the ID 97659 (Ubuntu 14.04 LTS / 16.04 LTS / 16.10 : lxc vulnerability (USN-3224-1)), 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 172475 (OpenSUSE Security Update for lxc, lxcfs (openSUSE-SU-2019:1481-1)).

Upgrading 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 vulnerability database at Tenable (97659). Entries connected to this vulnerability are available at 77056, 77057 and 78184.

Productinfo

Type

Virtualization Software

Name

Linux Containers

License

open-source

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.3
VulDB Meta Temp Score: 4.2

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

NVD Base Score: 3.3
NVD Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
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💳	💳	💳	💳	💳	💳
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
unlock	unlock	unlock	unlock	unlock	unlock
unlock	unlock	unlock	unlock	unlock	unlock
unlock	unlock	unlock	unlock	unlock	unlock

VulDB Base Score: 🔍
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Exploitinginfo

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

Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	unlock	unlock	unlock	unlock
Today	unlock	unlock	unlock	unlock

Nessus ID: 97659
Nessus Name: Ubuntu 14.04 LTS / 16.04 LTS / 16.10 : lxc vulnerability (USN-3224-1)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 841810
OpenVAS Name: Ubuntu Update for lxc USN-3224-1
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Timelineinfo

02/13/2017 🔍
03/09/2017 +24 days 🔍
03/09/2017 +0 days 🔍
03/10/2017 +1 days 🔍
03/14/2017 +4 days 🔍
03/14/2017 +0 days 🔍
03/14/2017 +0 days 🔍
03/15/2017 +1 days 🔍
09/07/2020 +1272 days 🔍

Sourcesinfo

Advisory: lists.linuxcontainers.org
Researcher: Jann Horn
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-5985 (🔍)
SecurityFocus: 96777 - LXC 'lxc/lxc_user_nic.c' Remote Privilege Escalation Vulnerability
OSVDB: - CVE-2017-5985 - Linux Containers - Privilege Escalation Issue

See also: 🔍

Entryinfo

Created: 03/15/2017 07:51
Updated: 09/07/2020 06:37
Changes: 03/15/2017 07:51 (75), 09/07/2020 06:37 (4)
Complete: 🔍