Spoofing attack in Microsoft Office Online Server

1) Spoofing attack

EUVDB-ID: #VU25200

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-0695

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

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform spoofing attack.

The vulnerability exists due to the Office Online Server does not validate origin in cross-origin communications correctly. A remote attacker can send a specially crafted request to an affected site, perform cross-origin attacks on affected systems and gain access to sensitive information.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Office Online Server: 2016

CPE2.3

• cpe:2.3:a:microsoft:office_online_server:2016:*:*:*:*:*:*:*

External links

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0695

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.