Microsoft Office Object memory corruption

CVSS Meta Temp Score
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CTI Interest Score
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6.7$0-$5k0.00

A vulnerability, which was classified as critical, was found in Microsoft Office (Office Suite Software) (the affected version is unknown). Affected is an unknown code of the component Object Handler. The manipulation with an unknown input leads to a memory corruption vulnerability. CWE is classifying the issue as CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

Microsoft Office allows a remote code execution vulnerability due to the way that it handles objects in memory, aka "Microsoft Office Memory Corruption Vulnerability". This CVE ID is unique from CVE-2017-8501.

The bug was discovered 07/11/2017. The weakness was disclosed 07/11/2017 with MWR InfoSecurity as KB3191907 as confirmed security update guide (Website). The advisory is available at portal.msrc.microsoft.com. This vulnerability is traded as CVE-2017-8502 since 05/03/2017. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. The technical details are unknown and an exploit is not available. The advisory points out:

A remote code execution vulnerability exists in Microsoft Office software when the software fails to properly handle objects in memory. An attacker who successfully exploited the vulnerability could run arbitrary code in the context of the current user. If the current user is logged on with administrative user rights, an attacker could take control of the affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights.

The vulnerability scanner Nessus provides a plugin with the ID 101371 (Security Update for Microsoft Office Products (July 2017)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Windows : Microsoft Bulletins and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 110300 (Microsoft Office and Microsoft Office Services and Web Apps Security Update July 2017).

Applying the patch KB3191907 is able to eliminate this problem. The bugfix is ready for download at catalog.update.microsoft.com. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (101371). The entries 103403, 103421, 103433 and 103434 are pretty similar.

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CVSSv3info

VulDB Meta Base Score: 7.0
VulDB Meta Temp Score: 6.9

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
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NVD Base Score: 7.8
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Exploitinginfo

Class: Memory corruption
CWE: CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

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Nessus ID: 101371
Nessus Name: Security Update for Microsoft Office Products (July 2017)
Nessus File: 🔍
Nessus Risk: 🔍
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OpenVAS ID: 802136
OpenVAS Name: Microsoft Excel 2013 Service Pack 1 Multiple Vulnerabilities (KB3213537)
OpenVAS File: 🔍
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Threat Intelligenceinfo

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Countermeasuresinfo

Recommended: Patch
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Patch: KB3191907

Timelineinfo

05/03/2017 🔍
07/11/2017 +69 days 🔍
07/11/2017 +0 days 🔍
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07/11/2017 +0 days 🔍
07/11/2017 +0 days 🔍
07/11/2017 +0 days 🔍
07/12/2017 +1 days 🔍
12/31/2020 +1268 days 🔍

Sourcesinfo

Vendor: microsoft.com

Advisory: KB3191907
Researcher: Yong Chuan Koh
Organization: MWR InfoSecurity
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-8502 (🔍)
OVAL: 🔍

SecurityTracker: 1038851
SecurityFocus: 99442 - Microsoft Office CVE-2017-8502 Memory Corruption Vulnerability

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Entryinfo

Created: 07/12/2017 10:37
Updated: 12/31/2020 16:55
Changes: 07/12/2017 10:37 (80), 10/24/2019 18:56 (5), 12/31/2020 16:52 (2), 12/31/2020 16:55 (1)
Complete: 🔍

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