SB2021101219 - Multiple vulnerabilities in Microsoft Office Visio

Description

This security bulletin contains information about 2 vulnerabilities.

1) Use-after-free (CVE-ID: CVE-2021-40481)

CWE-ID: CWE-416 - Use After Free

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 a use-after-free error when parsing WMF files. A remote attacker can create a specially crafted Microsoft Office Visio file, trick the victim into opening it, trigger a use-after-free error and execute arbitrary code on the system.

Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.

2) Improper Validation of Array Index (CVE-ID: CVE-2021-40480)

CWE-ID: CWE-129 - Improper Validation of Array Index

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 the affected system.

The vulnerability exists due to improper validation of user-supplied data when parsing EMF files in Microsoft Office Visio. A remote attacker can trick the victim to open a specially crafted file, trigger memory corruption and execute arbitrary code on the system.

Remediation

Install update from vendor's website.

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-40481
• https://www.zerodayinitiative.com/advisories/ZDI-21-1160/
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-40480
• https://www.zerodayinitiative.com/advisories/ZDI-21-1159/