Zero Day Initiative disclosed unpatched Microsoft Jet database flaw

All supported versions of Windows affected by remote code execution bug

Microsoft Jet database interface

Security researchers have disclosed a remote code execution vulnerability that affects the Microsoft Jet Database Engine.

According to a blog post by the Zero Day Initiative (ZDI), an out-of-bounds (OOB) write in the Microsoft JET Database Engine that could allow remote code execution was initially reported to Microsoft back in May. Microsoft managed to reproduce the bug shortly afterwards.

While Microsoft has patched two other buffer overflow bugs in Jet in its latest Patch Tuesday update, this bug has been left out and will be fully patched in the October update.

"An attacker could leverage this vulnerability to execute code under the context of the current process, however it does require user interaction since the target would need to open a malicious file. As of today, this bug remains unpatched," said Simon Zuckerbraun, a security researcher at ZDI.

The bug affects all supported Windows versions including server editions. The flaw itself can be triggered by opening a Jet source via a Microsoft component known as Object Linking and Embedding Database (OLEDB).

"To trigger this vulnerability, a user would need to open a specially crafted file containing data stored in the JET database format. Various applications use this database format. An attacker using this would be able to execute code at the level of the current process," said Zuckerbraun.

In a security advisory, ZDI said the issue is in Microsoft Jet's index manager. "Crafted data in a database file can trigger a write past the end of an allocated buffer," stated the advisory.

The advisory said that given the nature of the vulnerability "the only salient mitigation strategy is to restrict interaction with the application to trusted files".

A proof-of-concept exploit code has been posted on GitHub.

Featured Resources

The complete guide to changing your phone system provider

Optimise your phone system for better business results

Download now

Simplify cluster security at scale

Centralised secrets management across hybrid, multi-cloud environments

Download now

The endpoint as a key element of your security infrastructure

Threats to endpoints in a world of remote working

Download now

2021 state of IT asset management report

The role of IT asset management for maximising technology investments

Download now

Most Popular

Best MDM solutions 2020
mobile device management (MDM)

Best MDM solutions 2020

21 Oct 2020
What is Neuralink?
Technology

What is Neuralink?

24 Oct 2020
Hackers demand ransom from therapy patients after clinic data breach
Security

Hackers demand ransom from therapy patients after clinic data breach

27 Oct 2020