SB2021060830 - Privilege escalation in Microsoft Enhanced Cryptographic Provider

Description

This security bulletin contains information about 2 secuirty vulnerabilities.

1) Security restrictions bypass (CVE-ID: CVE-2021-31199)

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to improperly imposed security restrictions in Microsoft Enhanced Cryptographic Provider. A local user can bypass implemented security restrictions and read or modify otherwise restricted information.

Note, the vulnerability is being actively exploited in the wild and related to a zero-day vulnerability in Adobe Reader #VU53125 (CVE-2021-28550) patched on May 11.

2) Security restrictions bypass (CVE-ID: CVE-2021-31201)

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to improperly imposed security restrictions in Microsoft Enhanced Cryptographic Provider. A local user can bypass implemented security restrictions and read or modify otherwise restricted information.

Note, the vulnerability is being actively exploited in the wild and related to a zero-day vulnerability in Adobe Reader #VU53125 (CVE-2021-28550) patched on May 11.

Remediation

Install update from vendor's website.

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31199
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31201