Two remote code execution vulnerabilities when processing EPS files in Microsoft Office



Published: 2017-04-12 | Updated: 2017-05-10
Risk Critical
Patch available YES
Number of vulnerabilities 2
CVE-ID CVE-2017-0261
CVE-2017-0262
CWE-ID CWE-416
CWE-843
Exploitation vector Network
Public exploit Vulnerability #1 is being exploited in the wild.
Vulnerability #2 is being exploited in the wild.
Vulnerable software
Subscribe
Microsoft Office
Client/Desktop applications / Office applications

Vendor Microsoft

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

Changelog
--2017-05-09--
1) Patch was released for zero-day vulnerability CVE-2017-0261.
2) Second zero-day vulnerability in EPS handling was added.
3) Links were added to FireEye and Microsoft.

1) Use-after-free

EUVDB-ID: #VU6296

Risk: Critical

CVSSv3.1:

CVE-ID: CVE-2017-0261

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a use-after-free error when processing EPS images within Microsoft Office files. A remote attacker can create a specially crafted Office file with malicious EPS image, trick the victim into opening it and execute arbitrary code on the target system with privileges of the current user.

Successful exploitation of this vulnerability may allow an attacker to compromise vulnerable system.

Note: this vulnerability is being actively exploited in the wild.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Microsoft Office: 2010 - 2016


CPE2.3 External links

http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/2017-2605
http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-0261
http://www.fireeye.com/blog/threat-research/2017/05/eps-processing-zero-days.html
http://blogs.technet.microsoft.com/msrc/2017/05/09/coming-together-to-address-encapsulated-postscri...

Q & A

Can this vulnerability be exploited remotely?

How the attacker can exploit this vulnerability?

Is there known malware, which exploits this vulnerability?

2) Type confusion

EUVDB-ID: #VU6459

Risk: Critical

CVSSv3.1:

CVE-ID: CVE-2017-0262

CWE-ID: CWE-843 - Access of Resource Using Incompatible Type ('Type Confusion')

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a type confusion error when processing EPS wiles within Microsoft Office documents. A remote unauthenticated attacker can create a specially crafted document, trick the victim into opening it and execute arbitrary code on the target system with privileges of the current victim.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Note: this vulnerability is being actively exploited in the wild.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Microsoft Office: 2010 - 2016


CPE2.3 External links

http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-0262
http://www.fireeye.com/blog/threat-research/2017/05/eps-processing-zero-days.html
http://blogs.technet.microsoft.com/msrc/2017/05/09/coming-together-to-address-encapsulated-postscri...

Q & A

Can this vulnerability be exploited remotely?

How the attacker can exploit this vulnerability?

Is there known malware, which exploits this vulnerability?



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