Vulnerability identifier: #VU5209

Vulnerability risk: Critical

CVSSv3.1: 3.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:N/E:F/RL:O/RC:C]

CVE-ID: CVE-2014-1809

CWE-ID: CWE-264

Exploitation vector: Network

Exploit availability: No

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

Vendor: Microsoft

Description
The vulnerability allows a remote attacker to bypass security restrictions on the target system.

The weakness exists due to improper implementation of Address Space Layout Randomization (ASLR) features in MSCOMCTL. By persuading a victim to visit a specially-crafted Web site or open an application or Office document with a specially-crafted ActiveX control embedded within it, an attacker could exploit this vulnerability to bypass ASLR and execute another attack that otherwise would have been blocked by ASLR.

Successful exploitation of the vulnerability results in security bypass on the vulnerable system.

Note: the vulnerability was being actively exploited.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Microsoft Office: 2013 - 2013 RT, 2010, 2007

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External links
http://technet.microsoft.com/en-us/library/security/ms14-024

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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. However, a fully functional exploit for this vulnerability is available.