#VU7120 Buffer overflow in Windows and Windows Server - CVE-2017-8461

Vulnerability identifier: #VU7120

Vulnerability risk: High

CVSSv4.0: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A/U:Amber]

CVE-ID: CVE-2017-8461

CWE-ID: CWE-119

Exploitation vector: Network

Exploit availability: Yes

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 execute arbitrary code on the target system.

The vulnerability exists due to boundary error in RPC implementation, when Routing and Remote Access service is enabled in Windows XP and Windows 2003. A remote unauthenticated attacker can send a specially crafted RPC request to vulnerable system and execute arbitrary code with SYSTEM privileges.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Note: this vulnerability is being exploited in the wild.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Windows: XP

Windows Server: 2003

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External links
https://support.microsoft.com/en-us/help/4024323/security-update-of-windows-xp-and-windows-server-20...
https://technet.microsoft.com/en-us/library/security/4025685.aspx

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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?

No. We are not aware of malware exploiting this vulnerability. However, a fully functional exploit for this vulnerability is available.