Vulnerability identifier: #VU10261

Vulnerability risk: Critical

CVSSv3.1: 9.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:H/RL:O/RC:C]

CVE-ID: CVE-2017-0176

CWE-ID: CWE-119

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Windows
Operating systems & Components / Operating system
Windows Server
Operating systems & Components / Operating system

Vendor: Microsoft

Description
The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a boundary error in the Smart Card authentication code in gpkcsp.dll within Windows Remote Desktop services. A remote attacker can send specially crafted packets to the vulnerable system, trigger buffer overflow and execute arbitrary code on the target system.

Successful exploitation of the vulnerability may allow an attacker to gain complete control over the affected system.

Note: this vulnerability was publicly disclosed by the Shadow Brokers hacking team along with a fully functional exploit known as "“EsteemAudit".

The vulnerability is being exploited in the wild.

Mitigation
Install a security patch:
https://support.microsoft.com/en-us/help/4022747/security-update-for-windows-xp-and-windows-server-2...

Vulnerable software versions

Windows: XP

Windows Server: 2003

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External links
http://support.microsoft.com/en-us/help/4022747/security-update-for-windows-xp-and-windows-server-2...

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

Yes. This vulnerability is being exploited in the wild.