KLA10661
Multiple vulnerabillities in Microsoft Office

Multiple serious vulnerabilities have been found in Microsoft Office. Malicious users can exploit these vulnerabilities to execute arbitrary code or conduct XSS attack.

Below is a complete list of vulnerabilities

1. Improper memory objects handling can be exploited remotely via a specially designed file to execute arbitrary code;
2. Improper user-supplied web-requests sanitization at SharePoint can be exploited remotely via a specially designed user content to conduct cross-site-scripting;
3. An unknown vulnerability can be exploited remotely via a specially designed EPS file to execute arbitrary code.

Technical details

To exploit vulnerability (2) attacker must have ability to submit malicious content to a target site. In some conditions user content will not be sanitized. When user visits web page with malicious content? script could be run in security context of the user.

(3) could be exploited via specially designed EPS graphics contained in office document or when user inserts this graphics to office document. Also if Word is selected as default email reader (default) then attacker could send specially designed email contains malicious EPS graphics. In such conditions exploitations needs minimal users interaction (preview malicious email)

Office 2007 Service Pack 3
Excel 2007 Service Pack 3
Office 2010 Service Pack 2
Excel 2010 Service Pack 2
Office 2013 Service Pack 1
Excel 2013 Service Pack 1
Office 2013 RT Service Pack 1
Excel 2013 RT Service Pack 1
Excel for Mac 2011
Excel for Mac 2016
Office Compatibility Pack  Service Pack 3
Excel Viewer
SharePoint Foundation 2013 Service Pack 1

Install necessary updates from the KB section, that are listed in your Windows Update (Windows Update usually can be accessed from the Control Panel)

CVE-2015-2523
CVE-2015-2522
CVE-2015-2521
CVE-2015-2545
CVE-2015-2520

3054813
3085487
3085501
3085502
3085543
3085483
3088502
3088501
3054995
3054987
3054993
3089664
3054932
3054965
3085526

The following public exploits exists for this vulnerability:

https://www.exploit-db.com/exploits/38214

https://www.exploit-db.com/exploits/38216

https://www.exploit-db.com/exploits/38215

Malware exists for this vulnerability. Usually such malware is classified as Exploit. More details.