Vulnerability identifier: #VU6183

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-2017-7269

CWE-ID: CWE-119

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
Microsoft IIS
Server applications / Web servers
Windows Server
Operating systems & Components / Operating system
Windows
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 a boundary error in ScStoragePathFromUrl() function in the WebDAV service when processing overly long HTTP header beginning with "If: <http://" in a PROPFIND request. A remote unauthenticated attacker can trigger buffer overflow and execute arbitrary code on the target system with privileges of the IIS service.

Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.

Note: this vulnerability is being actively exploited in the wild in July and August 2016.

Mitigation

Install update from Microsoft website:

https://support.microsoft.com/en-us/help/3197835/description-of-the-security-update-for-windows-xp-a...

Vulnerable software versions

Microsoft IIS: 6.0

Windows Server: 2003

Windows: XP

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External links
http://github.com/edwardz246003/IIS_exploit

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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.