Information disclosure in its:// protocol handler in Microsoft Windows

Published: 2017-12-12 20:36:51
Severity Medium
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2017-11927
CVSSv3 5.7 [CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C]
CWE ID CWE-200
Exploitation vector Network
Public exploit Not available
Vulnerable software Windows
Windows Server
Vulnerable software versions Windows 8.1
Windows 7
Windows 10
Windows RT 8.1
Windows Server 2012
Windows Server 2012 R2
Windows Server 2008
Windows Server 2008 R2
Windows Server 2016
Vendor URL Microsoft

Security Advisory

1) Information disclosure

Description

The vulnerability allows a remote attacker to obtain potentially sensitive information.

The vulnerability exists due to an error in implementation, when the Windows "its://" protocol handler unnecessarily sends traffic to a remote site in order to determine the zone of a provided URL. A remote attacker can create a specially crafted web page, trick the victim into opening it and obtain potentially sensitive information, such as NTLM hash.

Remediation

Install updates from vendor's website.

External links

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-11927

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