SB2021051122 - Multiple vulnerabilities in Microsoft Skype for Business and Lync

Description

This security bulletin contains information about 2 secuirty vulnerabilities.

1) Code Injection (CVE-ID: CVE-2021-26422)

The vulnerability allows a remote user to execute arbitrary code on the target system.

The vulnerability exists due to improper input validation in Skype for Business and Lync. A remote administrator can execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

2) Spoofing attack (CVE-ID: CVE-2021-26421)

The vulnerability allows a remote attacker to perform spoofing attack.

The vulnerability exists due to incorrect processing of user-supplied data in Skype for Business and Lync. A remote authenticated attacker can spoof page content.

Remediation

Install update from vendor's website.

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26422
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26421