Vulnerability identifier: #VU9641

Vulnerability risk: Low

CVSSv3.1: 5.3 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-11932

CWE-ID: CWE-451

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Microsoft Exchange Server
Server applications / Mail servers

Vendor: Microsoft

Description
The vulnerability allows a remote attacker to perform spoofing attack.

The vulnerability exists due to error in Outlook Web Access (OWA) in Microsoft Exchange Server when parsing HTTP requests. A remote attacker can perform script or content injection attacks, and attempt to trick the user into disclosing sensitive information.

Additionally Microsoft has released an update for Microsoft Exchange that provides enhanced security as a defense-in-depth measure.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Microsoft Exchange Server: 2016 Cumulative Update 6 15.01.1034.026 - 2016 Cumulative Update 7 15.01.1261.035

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External links
http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-11932
http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/ADV170023

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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.