SB2017080816 - Multiple vulnerabilities in Windows Hyper-V

Description

This security bulletin contains information about 2 vulnerabilities.

1) Improper input validation (CVE-ID: CVE-2017-8664)

CWE-ID: CWE-20 - Improper input validation

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

The vulnerability allows a remote attacker to execute arbitrary code on the host server.

The vulnerability exists due to an error within Windows Hyper-V when processing input from guest operating system. A local user with access to guest operating system can execute arbitrary code on the host server.

Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable Hyper-V host server.

2) Improper input validation (CVE-ID: CVE-2017-8623)

CWE-ID: CWE-20 - Improper input validation

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

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to an error when processing from a privileged user on a guest operating system in Microsoft Hyper-V Network Switch on a host server. A local user with privileged access to guest operating system can send a specially crafted data to the host operating system and perform a denial of service (DoS) attack.

Remediation

Install update from vendor's website.

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-8664
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-8623