Multiple vulnerabilities in Microsoft Excel



Published: 2017-11-14
Risk High
Patch available YES
Number of vulnerabilities 2
CVE-ID CVE-2017-11877
CVE-2017-11878
CWE-ID CWE-264
CWE-119
Exploitation vector Network
Public exploit N/A
Vulnerable software
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Microsoft Excel
Client/Desktop applications / Office applications

Microsoft Excel for Mac
Client/Desktop applications / Office applications

Microsoft Office Compatibility Pack
Client/Desktop applications / Office applications

Vendor Microsoft

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Security feature bypass

EUVDB-ID: #VU9295

Risk: Medium

CVSSv3.1: 7.1 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-11877

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass certain security restrictions.

The vulnerability exists due to Microsoft Office does not enforce macro settings on an Excel document. A remote attacker can embed a control in an Excel worksheet that specifies a macro and runs it on the system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Microsoft Excel: 2007 - Viewer 2007 Service Pack 3

Microsoft Excel for Mac: 2016

Microsoft Office Compatibility Pack: Service Pack 3

External links

http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-11877


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 a file.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Buffer overflow

EUVDB-ID: #VU9296

Risk: High

CVSSv3.1: 8.3 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-11878

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

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

The vulnerability exists due to boundary error when processing Excel files. A remote unauthenticated attacker can create a specially crafted Excel file, trick the victim into opening it, trigger memory corruption and execute arbitrary code on the target system.

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

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Microsoft Excel: 2007 - Viewer 2007 Service Pack 3

Microsoft Office Compatibility Pack: Service Pack 3

External links

http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-11878


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 a file.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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