Information disclosure in Microsoft Exchange and related products

1) Input validation error

EUVDB-ID: #VU19080

Risk: Low

CVSSv3.1: 2.7 [CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-1084

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to sensitive information.

The vulnerability exists due to insufficient validation of display names that contain non-printable characters. A remote authenticated attacker can change his/her display name, perform spoofing attack against Microsoft Exchange users and gain access to sensitive information.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Microsoft Office: 365 ProPlus - 2019 for Mac

Microsoft Office for Mac: 2016

Microsoft Outlook: 2010 Service Pack 2 - 2016

Skype for Business: 2016

Microsoft Lync: 2013

Microsoft Exchange Server: 2010 - 2019 Cumulative Update 2 15.02.0397.003

External links

http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1084

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user 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.