NULL dereference when processing SMB traffic in Microsoft Windows



Published: 2017-02-03 | Updated: 2017-03-14
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2017-0016
CWE-ID CWE-476
Exploitation vector Network
Public exploit Public exploit code for vulnerability #1 is available.
Vulnerable software
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Windows
Operating systems & Components / Operating system

Windows Server
Operating systems & Components / Operating system

Vendor Microsoft

Security Bulletin

This security bulletin contains information about 1 vulnerabilities.

2017-03-14: Severity of this vulnerability was decreased from critical to medium. Added information about security patch.

1) NULL pointer dereference

EUVDB-ID: #VU5610

Risk: Medium

CVSSv3.1:

CVE-ID: CVE-2017-0016

CWE-ID: CWE-476 - NULL Pointer Dereference

Exploit availability: No

Description

The vulnerability allows a remote attacker to cause denial of service.

The vulnerability exists due to a NULL pointer dereference error when processing Server Message Block (SMB) network traffic. A remote attacker can send specially crafted response, containing too many bytes following the structure defined in the SMB2 TREE_CONNECT Response structure and cause the affected system to crash.

Successful exploitation of the vulnerability may allow an attacker to perform a denial of service (DoS) attack.

Note: the exploit code for this vulnerability is publicly available.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Windows: 8.1 - 10

Windows Server: 2012 - 2016


CPE2.3 External links

http://www.kb.cert.org/vuls/id/867968 
http://github.com/lgandx/PoC/tree/master/SMBv3%20Tree%20Connect
http://technet.microsoft.com/en-us/library/security/MS17-012

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?



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