December Microsoft Patch Tuesday addresses 19 Critical browser issues

Pierluigi Paganini December 13, 2017

Microsoft released Patch Tuesday updates for December 2017 that address more than 30 vulnerabilities, including 19 Critical browser issues.

Microsoft has released its Patch Tuesday updates for December 2017 that address more than 30 vulnerabilities, including 19 critical flaws affecting the Internet Explorer and Edge web browsers.

Microsoft addressed several memory corruption flaws that can be exploited for remote code execution. Most of the vulnerabilities reside in the browser’s scripting engine, an attack can trigger them by tricking the victim into visiting a specially crafted website or a site that serves malicious ads.

Microsoft acknowledged researchers from Google, Palo Alto Networks, McAfee and Qihoo 360 for finding the issues.

The list of vulnerabilities fixed this month includes “important” information disclosure flaw tracked as CVE-2017-11927. The vulnerability affects the Windows its:// protocol handler, where the InfoTech Storage Format (ITS) is the storage format used in CHM files.

“An information disclosure vulnerability exists when the Windows its:// protocol handler unnecessarily sends traffic to a remote site in order to determine the zone of a provided URL. This could potentially result in the disclosure of sensitive information to a malicious site.” read the security advisory published by Microsoft.

“To exploit the vulnerability an attacker would have to trick a user into browsing to a malicious website or to an SMB or UNC path destination. An attacker who successfully tricked a user into disclosing the user’s NTLM hash could attempt a brute-force attack to disclose the corresponding hash password.”

Microsoft patch Tuesday

The list of flaws addressed by Microsoft also includes a collection of information disclosure issues in Office, a privilege escalation vulnerability affecting SharePoint, a spoofing issue in Exchange, and a remote code execution vulnerability in Excel.

The good news is that according to Microsoft, none of the vulnerabilities addressed with the December Patch Tuesday has been exploited in attacks or disclosed publicly before fixes were released.

Adobe has also published its December Patch Tuesday, this month the company only patched one moderate severity vulnerability in Flash Player.

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Pierluigi Paganini

(Security Affairs – December Patch Tuesday, hacking)

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