Multiple vulnerabilities in Microsoft Office

Published: 2017-12-12 20:29:05 | Updated: 2017-12-12 20:31:29
Severity High
Patch available YES
Number of vulnerabilities 3
CVSSv2 3.7 (AV:N/AC:L/Au:N/C:P/I:N/A:N/E:U/RL:OF/RC:C)
6.9 (AV:N/AC:M/Au:N/C:C/I:C/A:C/E:U/RL:OF/RC:C)
3.2 (AV:N/AC:M/Au:N/C:P/I:N/A:N/E:U/RL:OF/RC:C)
CVSSv3 4.6 [CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]
8.3 [CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]
4 [CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N/E:U/RL:O/RC:C]
CVE ID CVE-2017-11939
CVE-2017-11935
CVE-2017-11934
CWE ID CWE-200
CWE-119
CWE-125
Exploitation vector Network
Public exploit Not available
Vulnerable software Microsoft Office
Microsoft Office for Mac
Vulnerable software versions Microsoft Office 2016
Microsoft Office 2013 RT
Microsoft Office 2013
Microsoft Office for Mac 2016
Vendor URL Microsoft
Advisory type Public

Security Advisory

Additionally Microsoft has released a defense in depth update to address Dynamic Update Exchange protocol (DDE) issues in all supported editions of Microsoft Word.
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/ADV170021

1) Information disclosure

Description

The vulnerability allows a remote attacker to obtain potentially sensitive information.

An information disclosure vulnerability exists when Microsoft Outlook fails to enforce copy/paste permissions on DRM-protected emails. An attacker who successfully exploited the vulnerability could potentially extract plaintext content from DRM-protected draft emails.

The vulnerability should be exploited exploited along with another vulnerability to access the victim's Drafts folder, either locally on the victim's system or remotely via MAPI.

Remediation

Install updates from vendor's website.

External links

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-11939

2) Buffer overflow

Description

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

The vulnerability exists due to boundary error when processing Microsoft 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.

Remediation

Install updates from vendor's website.

External links

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-11935

3) Out-of-bounds read

Description

The vulnerability allows a remote attacker to obtain potentially sensitive information.

The vulnerability exists due to boundary error when processing PowerPoint files. A remote attacker can create a specially crafted PowerPoint file, trick the victim into opening it and obtain information  and gain access to potentially sensitive information, stored in memory.

Remediation

Install updates from vendor's website.

External links

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-11934

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