1) Information disclosure

Severity: High

CVSSv3: 4 [CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:F/RL:O/RC:C]

CVE-ID: CVE-2013-5054

CWE-ID: CWE-200 - Information Exposure

Description

The vulnerability allows a remote attacker to obtain potentially sensitive information on the target system.

The weakness exists due to an error in handling of a specially crafted response when opening a malicious Office file. A remote attacker can create a specially crafted file using, host it on remote website, trick the victim into opening it and gain access to tokens used to authenticate the current user on a targeted SharePoint or other Microsoft Office server site.

Successful exploitation of the vulnerability results in information disclosure on the vulnerable system.

Note: the vulnerability was being actively exploited.

Mitigation

Install update from vendor's website:

Microsoft Office 2013 (32-bit editions):
https://www.microsoft.com/downloads/details.aspx?FamilyId=4daa3de8-4c70-498c-82d6-fe8250278e5e
Microsoft Office 2013 (64-bit editions):
https://www.microsoft.com/downloads/details.aspx?FamilyId=09f52670-bb42-425a-ac7b-1afddf82faea

Vulnerable software versions

Microsoft Office: 2013

CPE

• cpe:/a:microsoft:microsoft_office:2013:

External links

https://technet.microsoft.com/en-us/library/security/ms13-104.aspx

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to trick the victim to visit a specially crafted website or open an attachment in an e-mail message.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, a fully functional exploit for this vulnerability is available.