CVE-2018-0833

Microsoft Windows SMB Client Improper Initialization Denial of Service Vulnerability

Severity Score

5.3

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

The Microsoft Server Message Block 2.0 and 3.0 (SMBv2/SMBv3) client in Windows 8.1 and RT 8.1 and Windows Server 2012 R2 allows a denial of service vulnerability due to how specially crafted requests are handled, aka "SMBv2/SMBv3 Null Dereference Denial of Service Vulnerability".

El cliente Microsoft Server Message Block 2.0 y 3.0 (SMBv2/SMBv3) en Windows 8.1 y RT 8.1 y Windows Server 2012 R2 permite una vulnerabilidad de denegación de servicio (DoS) debido a la forma en la que se gestionan las peticiones especialmente manipuladas. Esto también se conoce como "SMBv2/SMBv3 Null Dereference Denial of Service Vulnerability".

This vulnerability allows remote attackers to deny service to vulnerable installations of Microsoft Windows. In some cases, user interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file, but attack vectors may vary depending on the implementation.
The specific flaw exists within the mrxsmb.sys driver. The issue results from the lack of proper initialization of a pointer prior to accessing it. An attacker can leverage this vulnerability to deny access to the target system.

*Credits: Nabeel Ahmed and Eric Schayes from Dimension Data

CVSS Scores

Attack Vector

Network

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Medium

Authentication

Single

Confidentiality

None

Integrity

None

Availability

Complete

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Complete

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2017-12-01 CVE Reserved
2018-02-15 CVE Published
2024-09-17 CVE Updated
2024-09-17 First Exploit
2024-09-18 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-476: NULL Pointer Dereference

CAPEC

References (5)

URL	Tag	Source
http://www.securityfocus.com/bid/102924	Third Party Advisory
http://www.securitytracker.com/id/1040375	Third Party Advisory

URL	Date	SRC
https://www.exploit-db.com/exploits/44189	2024-09-17
https://github.com/KINGSABRI/CVE-in-Ruby/tree/master/CVE-2018-0833	2024-09-17

URL	Date	SRC
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-0833	2019-03-13

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Microsoft Search vendor "Microsoft"		Windows 8.1 Search vendor "Microsoft" for product "Windows 8.1"				-		-		Affected
Microsoft Search vendor "Microsoft"		Windows Rt 8.1 Search vendor "Microsoft" for product "Windows Rt 8.1"				-		-		Affected
Microsoft Search vendor "Microsoft"		Windows Server 2012 Search vendor "Microsoft" for product "Windows Server 2012"				r2 Search vendor "Microsoft" for product "Windows Server 2012" and version "r2"		-		Affected