Linux Kernel up to 4.6.1 fs/ext4/inode.c System Calls information disclosure

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

Summaryinfo

A vulnerability has been found in Linux Kernel up to 4.6.1 and classified as problematic. This issue affects some unknown processing of the file fs/ext4/inode.c. The manipulation as part of System Calls leads to information disclosure. This vulnerability is uniquely identified as CVE-2017-7495. Local access is required to approach this attack. No exploit exists. Applying a patch is the recommended action to fix this issue.

Detailsinfo

A vulnerability was found in Linux Kernel up to 4.6.1 (Operating System) and classified as problematic. This issue affects an unknown part of the file fs/ext4/inode.c. The manipulation as part of a System Calls leads to a information disclosure vulnerability. Using CWE to declare the problem leads to CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. Impacted is confidentiality. The summary by CVE is:

fs/ext4/inode.c in the Linux kernel before 4.6.2, when ext4 data=ordered mode is used, mishandles a needs-flushing-before-commit list, which allows local users to obtain sensitive information from other users' files in opportunistic circumstances by waiting for a hardware reset, creating a new file, making write system calls, and reading this file.

The bug was discovered 05/15/2017. The weakness was disclosed 05/15/2017 as confirmed git commit (GIT Repository). The advisory is shared at git.kernel.org. The identification of this vulnerability is CVE-2017-7495 since 04/05/2017. An attack has to be approached locally. A simple authentication is necessary for exploitation. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1592 for this issue.

The vulnerability scanner Nessus provides a plugin with the ID 101852 (EulerOS 2.0 SP1 : kernel (EulerOS-SA-2017-1122)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Huawei Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 196895 (Ubuntu Security Notification for Linux Vulnerabilities (USN-3406-1)).

Upgrading to version 4.6.2 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 2 months after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (101852) and SecurityFocus (BID 98491†). The entry VDB-101233 is pretty similar. 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: 🔍
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

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Information disclosure
CWE: CWE-200 / CWE-284 / CWE-266
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 101852
Nessus Name: EulerOS 2.0 SP1 : kernel (EulerOS-SA-2017-1122)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 841810
OpenVAS Name: Ubuntu Update for linux USN-3406-1
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

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

Upgrade: Kernel 4.6.2
Patch: git.kernel.org

Timelineinfo

04/05/2017 🔍
05/15/2017 +40 days 🔍
05/15/2017 +0 days 🔍
05/15/2017 +0 days 🔍
05/15/2017 +0 days 🔍
05/16/2017 +1 days 🔍
06/15/2017 +30 days 🔍
07/21/2017 +36 days 🔍
12/06/2022 +1964 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: 06bd3c36a733ac27962fea7d6f47168841376824
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-7495 (🔍)
GCVE (CVE): GCVE-0-2017-7495
GCVE (VulDB): GCVE-100-101237
SecurityFocus: 98491
OSVDB: - CVE-2017-7495 - Linux - Information Disclosure Issue

See also: 🔍

Entryinfo

Created: 05/16/2017 03:51
Updated: 12/06/2022 13:35
Changes: 05/16/2017 03:51 (79), 09/26/2020 16:17 (6), 12/06/2022 13:35 (4)
Complete: 🔍
Cache ID: 216::103

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