Linux Kernel up to 4.13.1 fs/xfs/xfs_linux.h XFS_IS_REALTIME_INODE null pointer dereference

CVSS Meta Temp Score
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4.3$0-$5k0.00

A vulnerability, which was classified as problematic, has been found in Linux Kernel up to 4.13.1 (Operating System). This issue affects the function XFS_IS_REALTIME_INODE of the file fs/xfs/xfs_linux.h. 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. The summary by CVE is:

The XFS_IS_REALTIME_INODE macro in fs/xfs/xfs_linux.h in the Linux kernel before 4.13.2 does not verify that a filesystem has a realtime device, which allows local users to cause a denial of service (NULL pointer dereference and OOPS) via vectors related to setting an RHINHERIT flag on a directory.

The bug was discovered 12/22/2017. The weakness was presented 09/15/2017 as confirmed git commit (GIT Repository). The advisory is shared at git.kernel.org. The identification of this vulnerability is CVE-2017-14340 since 09/12/2017. An attack has to be approached locally. A simple authentication is needed for exploitation. Technical details are known, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 103363 (Debian DLA-1099-1 : linux security update (BlueBorne) (Stack Clash)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Debian Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 176163 (Debian Security Update for Linux (DSA 3981-1)).

Upgrading to version 4.13.2 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be patching the affected component. A possible mitigation has been published 5 days after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (103363) and SecurityFocus (BID 100851†). See VDB-105390, VDB-105605, VDB-106083 and VDB-106127 for similar entries. If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
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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: 🔍
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Exploitinginfo

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

Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 103363
Nessus Name: Debian DLA-1099-1 : linux security update (BlueBorne) (Stack Clash)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 53754
OpenVAS Name: Debian Security Advisory DSA 3981-1 (linux - security update)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Countermeasuresinfo

Recommended: Patch
Status: 🔍

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

Upgrade: Kernel 4.13.2
Patch: git.kernel.org

Timelineinfo

09/12/2017 🔍
09/13/2017 +1 days 🔍
09/15/2017 +2 days 🔍
09/15/2017 +0 days 🔍
09/16/2017 +1 days 🔍
09/20/2017 +4 days 🔍
09/21/2017 +1 days 🔍
12/22/2017 +92 days 🔍
12/29/2022 +1833 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: RHSA-2017:2918
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-14340 (🔍)
OVAL: 🔍

SecurityFocus: 100851 - Linux Kernel CVE-2017-14340 Local Denial of Service Vulnerability

See also: 🔍

Entryinfo

Created: 09/16/2017 02:08 PM
Updated: 12/29/2022 09:32 AM
Changes: 09/16/2017 02:08 PM (81), 11/17/2019 08:07 AM (5), 12/29/2022 09:32 AM (4)
Complete: 🔍
Cache ID: 18:34B:40

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