SB2020090862 - Multiple vulnerabilities in Microsoft Projected Filesystem

Description

This security bulletin contains information about 2 vulnerabilities.

1) Out-of-bounds read (CVE-ID: CVE-2020-16879)

CWE-ID: CWE-125 - Out-of-bounds read

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

The vulnerability allows a local user to gain access to potentially sensitive information.

The vulnerability exists due to a boundary condition when a Windows Projected Filesystem improperly handles file redirections. A local user can run a specially crafted application, trigger out-of-bounds read error and read contents of memory on the system.

2) Buffer overflow (CVE-ID: CVE-2020-0805)

CWE-ID: CWE-119 - Memory corruption

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

The vulnerability allows a local user to compromise the target system.

The vulnerability exists due to a boundary error when a Windows Projected Filesystem improperly handles file redirections. A local user can run a specially crafted application, trigger memory corruption and delete a targeted file they would not have permissions to.

Remediation

Install update from vendor's website.

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-16879
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0805