Vulnerability identifier: #VU19075

Vulnerability risk: High

CVSSv3.1: 7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-1093

CWE-ID: CWE-191

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Windows
Operating systems & Components / Operating system
Windows Server
Operating systems & Components / Operating system

Vendor: Microsoft

Description

The vulnerability allows a remote attacker to execute arbitrary code on the affected system.

The vulnerability exists due to an integer underflow during the parsing of font files in the DirectWrite library. A remote attacker can use a specially crafted document or a webpage, trick the victim into opening it, trigger an integer underflow and execute arbitrary code on the system.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Windows: 8.1 - 8.1 RT, 7, 10 - 10 1903

Windows Server: 2008 - 2019 1903

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External links
http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1093
http://www.zerodayinitiative.com/advisories/ZDI-19-654/

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.