Number: AV19-142
Date: 10 July 2019
On 9 July 2019 Microsoft has released security updates to address almost 80 vulnerabilities affecting Windows and Office products. This rollup provides fixes for 15 critical vulnerabilities, including a vulnerability in the Windows Server DHCP service, identified as CVE-2019-0785, that can be exploited by using a specially crafted packet. Successful exploitation could lead to remote code execution on the affected system. Importantly, the DHCP server must be set to failover mode for the attack to succeed.
Additionally, there have been active exploitations reported for the following two elevation of privilege vulnerabilities that are addressed in this rollup:
- CVE-2019-1132 - The Win32k component could be exploited to run arbitrary code in kernel mode due to improper handling of objects in memory.
- CVE-2019-0880 - splwow64.exe could be exploited to elevate privileges from low-integrity to medium integrity. This could allow an actor to leverage other vulnerabilities to gain further control of the affected system.
The Cyber Centre encourages users and administrators to review the Microsoft July 2019 Security Updates webpage and apply the necessary updates:
https://portal.msrc.microsoft.com/en-us/security-guidance
Note to Readers
The Canadian Centre for Cyber Security (Cyber Centre) operates as part of the Communications Security Establishment. We are Canada’s national authority on cyber security and we lead the government’s response to cyber security events. As Canada's national computer security incident response team, the Cyber Centre works in close collaboration with government departments, critical infrastructure, Canadian businesses and international partners to prepare for, respond to, mitigate, and recover from cyber events. We do this by providing authoritative advice and support, and coordinating information sharing and incident response. The Cyber Centre is outward-facing, welcoming partnerships that help build a stronger, more resilient cyber space in Canada.