Vulnerability identifier: #VU5560

Vulnerability risk: High

CVSSv3.1: 8.3 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2015-2378

CWE-ID: CWE-426

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Excel Viewer
Client/Desktop applications / Office applications
Microsoft Excel
Client/Desktop applications / Office applications
Microsoft Office
Client/Desktop applications / Office applications

Vendor: Microsoft

Description
The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to insecure .dll loading when processing Excel files. A remote attacker can place a specially crafted DLL file on a remote SMB or WebDav share along with Excel document, trick the victim into opening it and execute arbitrary code with privileges of the current user.

Successful exploitation of this vulnerability results in arbitrary code execution on the vulnerable system.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Excel Viewer:

Microsoft Excel:

Microsoft Office: 2007, 2010

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External links
http://technet.microsoft.com/en-us/library/security/ms15-070

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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.