VDB-135170 · CVE-2018-7191 · BID 106478

Linux Kernel up to 4.13.13 tun Subsystem null pointer dereference

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.
4.3	$0-$5k	0.00

Summaryinfo

A vulnerability classified as problematic was found in Linux Kernel up to 4.13.13. This affects an unknown part of the component tun Subsystem. Such manipulation leads to null pointer dereference. This vulnerability is referenced as CVE-2018-7191. The attack can only be performed from a local environment. No exploit is available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in Linux Kernel up to 4.13.13 (Operating System). It has been rated as problematic. Affected by this issue is an unknown function of the component tun Subsystem. The manipulation with an unknown input leads to a null pointer dereference vulnerability. Using CWE to declare the problem leads to CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. Impacted is availability. CVE summarizes:

In the tun subsystem in the Linux kernel before 4.13.14, dev_get_valid_name is not called before register_netdevice. This allows local users to cause a denial of service (NULL pointer dereference and panic) via an ioctl(TUNSETIFF) call with a dev name containing a / character. This is similar to CVE-2013-4343.

The weakness was published 05/17/2019 by Alex (Website). The advisory is available at securityfocus.com. This vulnerability is handled as CVE-2018-7191 since 02/17/2018. Local access is required to approach this attack. The successful exploitation requires a simple authentication. The technical details are unknown and an exploit is not available.

The commercial vulnerability scanner Qualys is able to test this issue with plugin 172481 (SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2019:1527-1) (Sad SACK)).

Upgrading to version 4.13.14 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at SecurityFocus (BID 106478†). Similar entries are available at VDB-10289, VDB-128716, VDB-134037 and VDB-134461. If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

Operating System

Vendor

Linux

Name

Kernel

Version

License

open-source

Website

Vendor: https://www.kernel.org/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.4
VulDB Meta Temp Score: 4.3

VulDB Base Score: 3.3
VulDB Temp Score: 3.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
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

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Kernel 4.13.14
Patch: git.kernel.org

Timelineinfo

02/17/2018 🔍
01/07/2019 +324 days 🔍
05/17/2019 +130 days 🔍
05/17/2019 +0 days 🔍
09/21/2023 +1588 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: 0ad646c81b2182f7fa67ec0c8c825e0ee165696d⛔
Researcher: Alex
Status: Confirmed

CVE: CVE-2018-7191 (🔍)
GCVE (CVE): GCVE-0-2018-7191
GCVE (VulDB): GCVE-100-135170
SecurityFocus: 106478 - Linux Kernel 'mm/mincore.c' Local Information Disclosure Vulnerability

See also: 🔍

Entryinfo

Created: 05/17/2019 14:58
Updated: 09/21/2023 16:45
Changes: 05/17/2019 14:58 (62), 06/13/2020 10:28 (4), 09/21/2023 16:45 (5)
Complete: 🔍
Cache ID: 216:0A5:103

If you want to get best quality of vulnerability data, you may have to visit VulDB.