Phishing attack in Microsoft Office

1) Input validation error

EUVDB-ID: #VU17641

Risk: Low

CVSSv3.1: 4.1 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-0540

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a phishing attack.

The vulnerability exists due to insufficient validation of URLs when processing Microsoft Office files. A remote attacker can create a specially crafted file, trick the victim into opening it and entering credentials.

Successful exploitation of the vulnerability may allow an attacker to perform a phishing attack and gain access to sensitive information.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Microsoft Office: 365 ProPlus - 2019

Microsoft Word: Viewer

Microsoft Excel: Viewer

Microsoft Office Compatibility Pack: Service Pack 3

Microsoft PowerPoint: Viewer

External links

http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-0540

Q & A

Can this vulnerability be exploited remotely?

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

How the attacker can exploit this vulnerability?

The attacker would have to trick the victim to visit a specially crafted website or open a file.

Is there known malware, which exploits this vulnerability?

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