Security bypass in Microsoft Office



Published: 2014-05-13 | Updated: 2017-01-20
Severity Critical
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2014-1809
CWE ID CWE-264
Exploitation vector Network
Public exploit This vulnerability is being exploited in the wild.
Vulnerable software
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Microsoft Office
Client/Desktop applications / Office applications

Vendor Microsoft

Security Advisory

This security advisory describes one critical risk vulnerability.

1) Security bypass

Severity: Critical

CVSSv3: 3.6 [CVSS:3.0/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 - Permissions, Privileges, and Access Controls

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: 2007, 2010, 2013, 2013 RT

CPE External links

https://technet.microsoft.com/en-us/library/security/ms14-024

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.