Linux Kernel rtnetlink Module net/core/rtnetlink.c rtnl_fill_link_ifmap information disclosure
CVSS Meta Temp Score | Current Exploit Price (≈) | CTI Interest Score |
---|---|---|
5.9 | $0-$5k | 0.00 |
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. There are known technical details, but no exploit is available. 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 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) and Tenable (91425). See 81887, 83140, 83141 and 83148 for similar entries.
Product
Type
Vendor
Name
License
CPE 2.3
CPE 2.2
CVSSv4
VulDB CVSS-B Score: 🔍VulDB CVSS-BT Score: 🔍
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CVSSv3
VulDB Meta Base Score: 6.6VulDB Meta Temp Score: 5.9
VulDB Base Score: 9.8
VulDB Temp Score: 8.5
VulDB Vector: 🔍
VulDB Reliability: 🔍
NVD Base Score: 3.3
NVD Vector: 🔍
CVSSv2
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VulDB Base Score: 🔍
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Exploiting
Class: Information disclosureCWE: CWE-200 / CWE-284 / CWE-266
ATT&CK: T1592
Local: Yes
Remote: No
Availability: 🔍
Status: Proof-of-Concept
Download: 🔍
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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 Intelligence
Interest: 🔍Active Actors: 🔍
Active APT Groups: 🔍
Countermeasures
Recommended: PatchStatus: 🔍
Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍
Patch: git.kernel.org
Timeline
05/04/2016 🔍05/04/2016 🔍
05/04/2016 🔍
05/10/2016 🔍
05/23/2016 🔍
06/01/2016 🔍
06/01/2016 🔍
08/17/2022 🔍
Sources
Vendor: kernel.orgAdvisory: USN-2989-1
Status: Confirmed
Confirmation: 🔍
CVE: CVE-2016-4486 (🔍)
OVAL: 🔍
X-Force: 113004 - Linux Kernel net/core/rtnetlink.c information disclosure
SecurityFocus: 90051 - Linux Kernel CVE-2016-4486 Local Information Disclosure Vulnerability
See also: 🔍
Entry
Created: 05/10/2016 10:38Updated: 08/17/2022 23:28
Changes: 05/10/2016 10:38 (76), 11/23/2018 10:45 (13), 08/17/2022 23:28 (4)
Complete: 🔍
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