Vulnerability identifier: #VU6178

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-2015-6122

CWE-ID: CWE-119

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Microsoft Excel
Client/Desktop applications / Office applications
Microsoft Excel for Mac
Client/Desktop applications / Office applications
Microsoft Office for Mac
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 weakness exists due to boundary error when handling malicious Excel files. A remote attacker can create a specially crafted .xls file, trick the victim into opening it, trigger memory corruption and execute arbitrary code with privileges of the current user.

Successful exploitation of the vulnerability may result in arbitrary code execution on the vulnerable system.

Mitigation
Install upfate from vendor's website.

Vulnerable software versions

Microsoft Excel:

Microsoft Excel for Mac: 2011

Microsoft Office for Mac: 2011

Microsoft Office: 2010, 2007

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External links
http://technet.microsoft.com/en-us/library/security/ms15-131.aspx

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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.