Vulnerability identifier: #VU15258

Vulnerability risk: Low

CVSSv3.1: 5.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-8448

CWE-ID: CWE-20

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 gain elevated privileges on the target system.

The vulnerability exists due to improper handling of web requests within Microsoft Exchange Outlook Web Access (OWA). A remote unauthenticated attacker can send a specially crafted email message containing a malicious link, trick the victim into clicking it and gain elevated privileges to conduct further attacks.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Microsoft Exchange Server: 2013 Cumulative Update 21 15.00.1395.004, 2016 Cumulative Update 10 15.01.1531.003

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External links
http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8448

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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.