SB2019111210 - Spoofing attack in Microsoft Office Online Server

Description

This security bulletin contains information about 2 secuirty vulnerabilities.

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

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)

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