Linux Kernel up to 4.7.4 uaccess.h __get_user_asm_ex information disclosure

CVSS Meta Temp Score
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CTI Interest Score
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5.4$0-$5k0.00

Summaryinfo

A vulnerability was found in Linux Kernel up to 4.7.4. It has been rated as problematic. This affects the function __get_user_asm_ex of the file arch/x86/include/asm/uaccess.h. Performing a manipulation results in information disclosure. This vulnerability is cataloged as CVE-2016-9178. The attack must be initiated from a local position. There is no exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in Linux Kernel up to 4.7.4 (Operating System). It has been classified as problematic. This affects the function __get_user_asm_ex of the file arch/x86/include/asm/uaccess.h. The manipulation with an unknown input leads to a information disclosure vulnerability. CWE is classifying the issue as CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. This is going to have an impact on confidentiality. The summary by CVE is:

The __get_user_asm_ex macro in arch/x86/include/asm/uaccess.h in the Linux kernel before 4.7.5 does not initialize a certain integer variable, which allows local users to obtain sensitive information from kernel stack memory by triggering failure of a get_user_ex call.

The bug was discovered 09/15/2016. The weakness was shared 11/28/2016 (Website). The advisory is shared at git.kernel.org. This vulnerability is uniquely identified as CVE-2016-9178 since 11/04/2016. The exploitability is told to be easy. An attack has to be approached locally. The successful exploitation requires a authentication. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1592 for this issue.

The vulnerability was handled as a non-public zero-day exploit for at least 73 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 95702 (openSUSE Security Update : the Linux Kernel (openSUSE-2016-1428)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family SuSE Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 169574 (OpenSuSE Security Update for the Linux Kernel (openSUSE-SU-2016:3058-1)).

Upgrading to version 4.7.5 eliminates this vulnerability. A possible mitigation has been published 2 weeks after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (95702) and SecurityFocus (BID 94144†). The entries VDB-93467, VDB-93468, VDB-93490 and VDB-93845 are related to this item. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.5
VulDB Meta Temp Score: 5.4

VulDB Base Score: 5.5
VulDB Temp Score: 5.3
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: 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: 95702
Nessus Name: openSUSE Security Update : the Linux Kernel (openSUSE-2016-1428)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 71943
OpenVAS Name: Ubuntu Update for linux-raspi2 USN-3161-3
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

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

Upgrade: Kernel 4.7.5
Patch: git.kernel.org

Timelineinfo

09/15/2016 🔍
11/04/2016 +50 days 🔍
11/08/2016 +4 days 🔍
11/27/2016 +19 days 🔍
11/28/2016 +1 days 🔍
11/28/2016 +0 days 🔍
12/08/2016 +10 days 🔍
12/12/2016 +4 days 🔍
10/04/2022 +2122 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: 1c109fabbd51863475cd12ac206bdd249aee35af
Status: Not defined
Confirmation: 🔍

CVE: CVE-2016-9178 (🔍)
GCVE (CVE): GCVE-0-2016-9178
GCVE (VulDB): GCVE-100-93849
SecurityFocus: 94144 - Linux Kernel CVE-2016-9178 Local Information Disclosure Vulnerability

See also: 🔍

Entryinfo

Created: 11/28/2016 09:32
Updated: 10/04/2022 15:04
Changes: 11/28/2016 09:32 (70), 06/11/2019 10:30 (14), 10/04/2022 15:04 (4)
Complete: 🔍
Cache ID: 216:350:103

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