SB2017121213 - Multiple vulnerabilities in Microsoft Office

Description

This security bulletin contains information about 3 secuirty vulnerabilities.

1) Information disclosure (CVE-ID: CVE-2017-11939)

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.

2) Buffer overflow (CVE-ID: CVE-2017-11935)

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.

3) Out-of-bounds read (CVE-ID: CVE-2017-11934)

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 update from vendor's website.

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-11939
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-11935
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-11934