Vulnerability identifier: #VU19080

Vulnerability 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

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Microsoft Office
Client/Desktop applications / Office applications
Microsoft Office for Mac
Client/Desktop applications / Office applications
Microsoft Outlook
Client/Desktop applications / Office applications
Skype for Business
Client/Desktop applications / Messaging software
Microsoft Lync
Client/Desktop applications / Messaging software
Microsoft Exchange Server
Server applications / Mail servers

Vendor: Microsoft

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: 2013 - 2013 RT, 2019 - 2019 for Mac, 365 ProPlus

Microsoft Office for Mac: 2016

Microsoft Outlook:

Skype for Business: 2016

Microsoft Lync:

Microsoft Exchange Server: 2010, 2019 Cumulative Update 1 15.02.0330.005 - 2019 Cumulative Update 2 15.02.0397.003, 2016 Cumulative Update 12 15.01.1713.005 - 2016 Cumulative Update 13 15.01.1779.002, 2013 Cumulative Update 23 15.00.1497.002

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

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Q & A

Can this vulnerability be exploited remotely?

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

Is there known malware, which exploits this vulnerability?

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