Microsoft seems to be going through a very difficult month, as it has just been revealed that a exploit on database engine Microsoft JET, which it is supposed to repair, remains open to attacks.
Το 0Day ανακαλύφθηκε από τον Lucas Leong της ερευνητικής ομάδας της Trend Micro Security, και βρίσκεται στο Jet Database Engine της Microsoft Jet. Η vulnerability could allow an attacker to remotely run malicious code on any vulnerable Windows computer.
Microsoft Jet Database Engine or simply JET (from Joint Engine Technology) is a database engine built into many Microsoft products, such as Microsoft Access and Visual Basic.
According to an announcement issued by the Zero Day Initiative (ZDI), the vulnerability is due to an issue with pointer management in the Jet Database Engine that, if successfully exploited, can cause an out-bounds memory write, and remote implementation code.
The attacker would have to convince the target to open a specially crafted archive JET database to exploit the vulnerability and remotely execute malicious code on the target computer.
According to ZDI researchers, the vulnerability exists in all supported versions of Windows, namely: Windows 10, Windows 8.1, Windows 7, and Windows Server Edition 2008 through 2016.
The JET engine is one of Microsoft's first database innovations. It was developed in the 90s and has been used to power various company applications including: Access, Visual Basic, Microsoft Project and IIS 3.0.
JET, meanwhile, although removed and replaced by newer technologies, is still included in Windows.
Security technicians of course criticize Microsoft for failing to fix the vulnerability, mainly because it allows full access to the user systems of its operating companies.
Microsoft finally managed to address the problem and made one available last Tuesday.
However, according to Mitja Kolsek, co-founder of 0patch, the recent update for Microsoft's JET is incomplete, and intruders can still exploit the initial vulnerability.
"At this point we will only state that we found the update to be slightly different from our micropatch and, unfortunately, in a way that reduces the vulnerability, rather than eliminating it." he said Kolsek.
"We immediately informed Microsoft about this and will not disclose further details or any poc until they issue a valid solution."
0Patch released a custom "micro-patch" for JET 0Day when it came out, and today released another one which fixes the Microsoft update that affected the original JET fix.
The good news is that until today neither Microsoft nor 0Patch has seen hackers attempting to exploit this vulnerability in Microsoft JET.
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