Vulnerability identifier: #VU7454

Vulnerability risk: Low

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-8621

CWE-ID: CWE-601

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 redirect website visitors to external websites.

The weakness exists due to incorrect handling of open redirect requests by Microsoft Exchange. A remote attacker can create a specially crafted link, redirect the victim on potentially dangerous website and gain access to potentially sensitive information.

Successful exploitation of the vulnerability may result in information disclosure.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Microsoft Exchange Server: 2010, 2013 Service Pack 1 15.00.0847.032, 2016 Cumulative Update 5 15.01.0845.034

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External links
http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-8621

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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.