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A Vulnerability in Microsoft Windows JET Database Engine Could Allow for Remote Code Execution

MS-ISAC ADVISORY NUMBER:

2018-105

DATE(S) ISSUED:

09/24/2018

OVERVIEW:

A vulnerability has been discovered in Microsoft Windows JET Database Engine that could allow for remote code execution. The JET Database Engine provides data access to various applications such as Microsoft Access, Microsoft Visual Basic, and third-party applications. Successful exploitation of this vulnerability could allow for a remote attacker to execute code in the context of the current process. Depending on the privileges associated with this process, an attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. Processes that are configured to have fewer user rights on the system could be less impacted than those who operate with administrative user rights.

THREAT INTELLIGENCE:

There are currently no reports of these vulnerabilities being exploited in the wild.

SYSTEMS AFFECTED:

  • Microsoft Windows 7 cpe:/o:microsoft:windows_7 SYMC
  • Only Windows 7 has been confirmed vulnerable but the exploited component is included in all supported versions of Windows, including server editions.

RISK:

Government:
  • Large and medium government entities: MEDIUM
  • Small government entities: HIGH
Businesses:
  • Large and medium business entities: MEDIUM
  • Small business entities: HIGH
Home Users:
LOW

TECHNICAL SUMMARY:

A vulnerability has been discovered in Microsoft Windows JET Database Engine that could allow for remote code execution. This vulnerability is due to an out-of-bounds write error. Specifically, this issue exists within the management of indexes. An attacker can exploit this issue by enticing a victim to open a specially crafted Jet data source via OLEDB.

Successful exploitation of this vulnerability could allow for a remote attacker to execute code in the context of the current process. Depending on the privileges associated with this process, an attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. Processes that are configured to have fewer user rights on the system could be less impacted than those who operate with administrative user rights.

RECOMENDATIONS:

We recommend the following actions be taken:

  • Apply appropriate patches provided by Microsoft to vulnerable systems once they are released after appropriate testing.
  • Run all software as a non-privileged user (one without administrative rights) to diminish the effects of a successful attack.
  • Remind all users not to visit untrusted websites or follow links provided by unknown or untrusted sources.
  • Inform and educate users regarding threats posed by hypertext links contained in emails or attachments especially from untrusted sources
  • Apply the Principle of Least Privilege to all systems and services.

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