Linux Kernel sound/core/timer.c information disclosure

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.
6.3	$0-$5k	0.00

Summaryinfo

A vulnerability classified as problematic was found in Linux Kernel. This affects an unknown function of the file sound/core/timer.c. Executing a manipulation can lead to information disclosure. The identification of this vulnerability is CVE-2016-4578. The attack can only be executed locally. Furthermore, there is an exploit available. Applying a patch is advised to resolve this issue.

Detailsinfo

A vulnerability has been found in Linux Kernel (Operating System) (version unknown) and classified as critical. This vulnerability affects an unknown function of the file sound/core/timer.c. The manipulation with an unknown input leads to a information disclosure vulnerability. The CWE definition for the vulnerability is CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. As an impact it is known to affect confidentiality, integrity, and availability.

The weakness was shared 05/11/2016 as confirmed mailinglist post (oss-sec). The advisory is shared for download at seclists.org. This vulnerability was named CVE-2016-4578 since 05/11/2016. The exploitation appears to be easy. The attack needs to be approached locally. No form of authentication is required for a successful exploitation. Technical details and also a public exploit are known. The MITRE ATT&CK project declares the attack technique as T1592. Responsible for the vulnerability is the following code:

if (p == dest_master || IS_MNT_MARKED(p)) {
   while (last_dest->mnt_master != p) {
      last_source = last_source->mnt_master;
      last_dest = last_source->mnt_parent;
   }
   if (!peers(n, last_dest)) {
      last_source = last_source->mnt_master;
      last_dest = last_source->mnt_parent;
   }
}

It is possible to download the exploit at packetstormsecurity.com. It is declared as proof-of-concept. The vulnerability scanner Nessus provides a plugin with the ID 91875 (Ubuntu 16.04 LTS : linux-snapdragon vulnerabilities (USN-3016-3)), 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 168927 (OpenSuSE Security Update for the Linux Kernel (openSUSE-SU-2016:1641-1)).

Applying a patch is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. A possible mitigation has been published 2 months after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at X-Force (113158), Tenable (91875) and SecurityFocus (BID 90535†). The entries VDB-83139, VDB-87126, VDB-87608 and VDB-87611 are related to this item. Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

Operating System

Vendor

Linux

Name

Kernel

License

open-source

Website

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

CPE 2.3info

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CPE 2.2info

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CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.7
VulDB Meta Temp Score: 6.3

VulDB Base Score: 7.8
VulDB Temp Score: 7.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
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💳	💳	💳	💳	💳	💳
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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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: 🔍
Access: Public
Status: Proof-of-Concept
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 91875
Nessus Name: Ubuntu 16.04 LTS : linux-snapdragon vulnerabilities (USN-3016-3)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 800225
OpenVAS Name: Ubuntu Update for linux-lts-wily USN-3017-3
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Exploit-DB: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

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

Patch: git.kernel.org

Timelineinfo

05/11/2016 🔍
05/11/2016 +0 days 🔍
05/11/2016 +0 days 🔍
05/13/2016 +2 days 🔍
05/23/2016 +10 days 🔍
06/27/2016 +35 days 🔍
06/28/2016 +1 days 🔍
06/13/2024 +2907 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: USN-3016-3
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2016-4578 (🔍)
GCVE (CVE): GCVE-0-2016-4578
GCVE (VulDB): GCVE-100-87304

OVAL: 🔍

X-Force: 113158 - Linux Kernel sound/core/timer.c information disclosure
SecurityFocus: 90535 - Linux Kernel CVE-2016-4578 Multiple Local Information Disclosure Vulnerabilities

scip Labs: https://www.scip.ch/en/?labs.20161013
See also: 🔍

Entryinfo

Created: 05/13/2016 11:18
Updated: 06/13/2024 06:17
Changes: 05/13/2016 11:18 (63), 11/24/2018 12:24 (22), 08/19/2022 09:42 (5), 08/19/2022 09:47 (1), 08/19/2022 09:48 (1), 06/13/2024 06:17 (22)
Complete: 🔍
Cache ID: 216:BF4:103

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