SB2018061231 - Multiple vulnerabilities in Microsoft Hyper-V

Description

This security bulletin contains information about 2 vulnerabilities.

1) Improper input validation (CVE-ID: CVE-2018-8218)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows an adjacent low-privileged attacker to cause DoS condition on the target system.

The vulnerability exists due to an error when virtual machines access the Hyper-V Network Switch. An adjacent attacker can run a specially crafted application that causes a host machine to crash.

2) Privilege escalation (CVE-ID: CVE-2018-8219)

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

CVSSv4: CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows an adjacent attacker to gain elevated privileges on the target system.

The vulnerability exists due to an error when Windows Hyper-V instruction emulation fails to properly enforce privilege levels. An adjacent attacker can gain elevated privileges on a target guest operating system.

Remediation

Install update from vendor's website.

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8218
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8219