Hours before today’s Patch Tuesday release on the eve of May 8, Microsoft released an emergency updated to fix a vulnerability in their Malware Protection Engine. This critical vulnerability allows an attacker to take complete control of the victim’s machine by just sending an e-mail attachment. When the malware protection engine scans the attachment the malicious code in the file gets executed, allowing the attacker complete and full access to the computer. The attack can also be carried out by sending the file via an instant message or having the victim download the file from a website. It is absolutely essential that organizations using Microsoft Malware Protection Engine make sure that they are at version Version 1.1.13704.0 or later. Users should also check if they are patched for CVE-2017-0290, which was released for the same issue today.
In today’s Patch Tuesday update Microsoft released a total of 57 vulnerability fixes. Highest priority should go to patching 0-day issues which are actively exploited. On top of our list is the Office patch for CVE-2017-0261 which is triggered when a victim opens an Office file containing a malformed graphics image. The file could be delivered via email or any other means. As this is actively exploited in the wild and attackers can take complete control of the victim system, this should be treated with priority.