Linux Kernel rtnetlink net/core/rtnetlink.c rtnl_fill_link_ifmap 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.
6.1	$0-$5k	0.00

Summaryinfo

A vulnerability was found in Linux Kernel. It has been declared as problematic. This affects the function rtnl_fill_link_ifmap of the file net/core/rtnetlink.c of the component rtnetlink Module. Such manipulation leads to information disclosure. This vulnerability is listed as CVE-2016-4486. The attack may be performed from remote. In addition, an exploit is available. Applying a patch is advised to resolve this issue.

Detailsinfo

A vulnerability was found in Linux Kernel (Operating System) (version now known). It has been rated as critical. Affected by this issue is the function rtnl_fill_link_ifmap of the file net/core/rtnetlink.c of the component rtnetlink Module. The manipulation with an unknown input 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, integrity, and availability. CVE summarizes:

The rtnl_fill_link_ifmap function in net/core/rtnetlink.c in the Linux kernel before 4.5.5 does not initialize a certain data structure, which allows local users to obtain sensitive information from kernel stack memory by reading a Netlink message.

The weakness was presented 05/04/2016 as confirmed mailinglist post (oss-sec). The advisory is shared for download at seclists.org. This vulnerability is handled as CVE-2016-4486 since 05/04/2016. The exploitation is known to be easy. The attack needs to be approached locally. No form of authentication is required for exploitation. Technical details as well as a public exploit are known. The MITRE ATT&CK project declares the attack technique as T1592. The following code is the reason for this vulnerability:

struct rtnl_link_ifmap map = {
   .mem_start   = dev->mem_start,
   .mem_end     = dev->mem_end,
   .base_addr   = dev->base_addr,
   .irq         = dev->irq,
   .dma         = dev->dma,
   .port        = dev->if_port,
};

The exploit is available at exploit-db.com. It is declared as proof-of-concept. As 0-day the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 91425 (Ubuntu 14.04 LTS : linux vulnerabilities (USN-2989-1)), 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 196488 (Ubuntu Security Notification for Linux Vulnerabilities (USN-2989-1)).

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 4 weeks after the disclosure of the vulnerability. The vulnerability will be addressed with the following lines of code:

struct rtnl_link_ifmap map;

memset(&map, 0, sizeof(map));
map.mem_start   = dev->mem_start;
map.mem_end     = dev->mem_end;
map.base_addr   = dev->base_addr;
map.irq         = dev->irq;
map.dma         = dev->dma;
map.port        = dev->if_port;

The vulnerability is also documented in the databases at X-Force (113004), Tenable (91425) and SecurityFocus (BID 90051†). See VDB-81887, VDB-83140, VDB-83141 and VDB-83148 for similar entries. If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

Operating System

Vendor

Linux

Name

Kernel

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: 6.6
VulDB Meta Temp Score: 6.1

VulDB Base Score: 9.8
VulDB Temp Score: 8.8
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 3.3
NVD Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

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: Yes

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: 91425
Nessus Name: Ubuntu 14.04 LTS : linux vulnerabilities (USN-2989-1)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 840909
OpenVAS Name: Ubuntu Update for linux-lts-xenial USN-3005-1
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

05/04/2016 🔍
05/04/2016 +0 days 🔍
05/04/2016 +0 days 🔍
05/10/2016 +6 days 🔍
05/23/2016 +13 days 🔍
06/01/2016 +9 days 🔍
06/01/2016 +0 days 🔍
11/09/2024 +3083 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: USN-2989-1
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2016-4486 (🔍)
GCVE (CVE): GCVE-0-2016-4486
GCVE (VulDB): GCVE-100-87128

OVAL: 🔍

X-Force: 113004 - Linux Kernel net/core/rtnetlink.c information disclosure
SecurityFocus: 90051 - Linux Kernel CVE-2016-4486 Local Information Disclosure Vulnerability

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

Entryinfo

Created: 05/10/2016 10:38
Updated: 11/09/2024 05:33
Changes: 05/10/2016 10:38 (76), 11/23/2018 10:45 (13), 08/17/2022 23:28 (4), 11/09/2024 05:33 (21)
Complete: 🔍
Cache ID: 216:67D:103

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