SB2019111210 - Spoofing attack in Microsoft Office Online Server

Description

This security bulletin contains information about 2 vulnerabilities.

1) Spoofing attack (CVE-ID: CVE-2019-1447)

CWE-ID: CWE-451 - User Interface (UI) Misrepresentation of Critical Information (Clickjacking, spoofing)

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

The vulnerability allows a remote attacker to perform spoofing attack.

The vulnerability exists due to Office Online Server improperly validates origin in cross-origin communications handlers. A remote attacker can send a specially crafted request to the affected website and perform a spoofing attack against an authenticated user.

Successful exploitation of the vulnerability may allow an attacker gain access to victim's account.

2) Spoofing attack (CVE-ID: CVE-2019-1445)

CWE-ID: CWE-451 - User Interface (UI) Misrepresentation of Critical Information (Clickjacking, spoofing)

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

The vulnerability allows a remote attacker to perform spoofing attack.

The vulnerability exists due to Office Online Server improperly validates origin in cross-origin communications handlers. A remote attacker can send a specially crafted request to the affected website and perform a spoofing attack against an authenticated user.

Successful exploitation of the vulnerability may allow an attacker gain access to victim's account.

Remediation

Install update from vendor's website.

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1447
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1445