Linux Kernel up to 4.6.3 Netlink Message netlink_compat.c tipc_nl_compat_link_dump Memory information disclosure

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

Summaryinfo

A vulnerability was found in Linux Kernel up to 4.6.3. It has been rated as problematic. Affected by this issue is the function tipc_nl_compat_link_dump of the file net/tipc/netlink_compat.c of the component Netlink Message Handler. This manipulation causes information disclosure (Memory). This vulnerability is registered as CVE-2016-5243. The attack needs to be launched locally. No exploit is available. It is recommended to apply a patch to fix this issue.

Detailsinfo

A vulnerability has been found in Linux Kernel up to 4.6.3 (Operating System) and classified as problematic. Affected by this vulnerability is the function tipc_nl_compat_link_dump of the file net/tipc/netlink_compat.c of the component Netlink Message Handler. The manipulation with an unknown input leads to a information disclosure vulnerability (Memory). 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. The summary by CVE is:

The tipc_nl_compat_link_dump function in net/tipc/netlink_compat.c in the Linux kernel through 4.6.3 does not properly copy a certain string, which allows local users to obtain sensitive information from kernel stack memory by reading a Netlink message.

The weakness was published 06/03/2016 (oss-sec). It is possible to read the advisory at openwall.com. This vulnerability is known as CVE-2016-5243 since 06/03/2016. The exploitation appears to be easy. Attacking locally is a requirement. The successful exploitation requires a single authentication. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1592 according to MITRE ATT&CK. Responsible for the vulnerability is the following code: 

strcpy(link_info.str, nla_data(link[TIPC_NLA_LINK_NAME]));

The vulnerability scanner Nessus provides a plugin with the ID 92085 (Fedora 22 : kernel (2016-3daf782dfa)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Fedora Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 196556 (Ubuntu Security Notification for Linux-snapdragon Vulnerabilities (USN-3057-1)).

Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com. A possible mitigation has been published even before and not after the disclosure of the vulnerability. The vulnerability will be addressed with the following lines of code:

nla_strlcpy(link_info.str, nla_data(link[TIPC_NLA_LINK_NAME]),
	    TIPC_MAX_LINK_NAME);

The vulnerability is also documented in the databases at Tenable (92085) and SecurityFocus (BID 91334†). Similar entry is available at VDB-88376. Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

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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

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

NVD Base Score: 🔍

Exploitinginfo

Name: Memory
Class: Information disclosure / Memory
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: 92085
Nessus Name: Fedora 22 : kernel (2016-3daf782dfa)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 800923
OpenVAS Name: Fedora Update for kernel FEDORA-2016-3daf782dfa
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍

Patch: github.com

Timelineinfo

06/02/2016 🔍
06/03/2016 +1 days 🔍
06/03/2016 +0 days 🔍
06/03/2016 +0 days 🔍
06/27/2016 +24 days 🔍
06/29/2016 +2 days 🔍
07/14/2016 +15 days 🔍
08/25/2022 +2233 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: FEDORA-2016-3daf782dfa
Status: Not defined
Confirmation: 🔍

CVE: CVE-2016-5243 (🔍)
GCVE (CVE): GCVE-0-2016-5243
GCVE (VulDB): GCVE-100-88375

OVAL: 🔍

SecurityFocus: 91334 - Linux Kernel CVE-2016-5243 Local Information Disclosure Vulnerability

See also: 🔍

Entryinfo

Created: 06/29/2016 11:21
Updated: 08/25/2022 12:44
Changes: 06/29/2016 11:21 (72), 02/12/2019 10:35 (13), 08/25/2022 12:36 (3), 08/25/2022 12:44 (1)
Complete: 🔍
Cache ID: 216::103

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