Remote code execution in Microsoft Jet Database

1) Out-of-bounds write

EUVDB-ID: #VU14818

Risk: High

CVSSv3.1: 8.3 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:U/RC:C]

CVE-ID: CVE-2018-8423

CWE-ID: CWE-787 - Out-of-bounds write

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise affected system.

The vulnerability exists due to a boundary error within the Microsoft Jet database engine when processing indexes in database files. A remote attacker can create a specially crafted file, trick the victim into opening it, trigger out-of-bounds write and execute arbitrary code on the target system.

Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.

Mitigation

Microsoft has issued security patch to address this vulnerability on October 9. However patch was insufficient and did not cover all available attack vectors. The vulnerability remains unpatched.

Vulnerable software versions

Windows: 7 - 10 1809

Windows Server: 2008 - 2019 1803

External links

http://www.zerodayinitiative.com/advisories/ZDI-18-1075/
http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8423
http://www.zerodayinitiative.com/blog/2018/9/20/zdi-can-6135-a-remote-code-execution-vulnerability-...

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.