NULL dereference when processing SMB traffic in Microsoft Windows

Published: 2017-02-03 10:31:06 | Updated: 2017-03-14 22:29:32
Severity Medium
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2017-0016
CVSSv3 9.3 [CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:F/RL:O/RC:C]
CWE ID CWE-476
Exploitation vector Network
Public exploit Public exploit code for vulnerability #1 is available.
Vulnerable software Windows
Windows Server
Vulnerable software versions Windows 8.1
Windows 10
Windows Server 2012
Windows Server 2012 R2
Windows Server 2016
Vendor URL Microsoft

Security Advisory

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

1) NULL pointer dereference

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.

Remediation

Install updates from vendor's website.

External links

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

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