SB2018111326 - Remote code execution in Microsoft PowerShell

Description

This security bulletin contains information about 2 vulnerabilities.

1) Input validation error (CVE-ID: CVE-2018-8256)

CWE-ID: CWE-20 - Improper input validation

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

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to insufficient validation of user-supplied input within PowerShell files. A remote attacker can create a specially crafted PowerShell file, trick the victim into opening it and execute arbitrary code on the target system with privileges of the current user.

2) Input validation error (CVE-ID: CVE-2018-8415)

CWE-ID: CWE-20 - Improper input validation

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

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to insufficient validation of user-supplied input within PowerShell files. A remote attacker can create a specially crafted PowerShell file, trick the victim into opening it and execute unlogged code on the target system with privileges of the current user.

Remediation

Install update from vendor's website.

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8256
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8415