Windows code-execution zeroday is under active exploit, Microsoft warns

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Windows code-execution zeroday is under active exploit, Microsoft warns

From: InfoSec News <alerts () infosecnews org>
Date: Wed, 25 Mar 2020 09:15:58 +0000 (UTC) By Dan Goodin
Ars Technica

Attackers are actively exploiting a Windows zero-day vulnerability that can execute malicious code on fully updated systems, Microsoft warned on Monday.


The font-parsing remote code-execution vulnerability is being used in “limited targeted attacks,” the software maker said in an advisory published on Monday morning. The security flaw exists in the Adobe Type Manager Library, a Windows DLL file that a wide variety of apps use to manage and render fonts available from Adobe Systems. The vulnerability consists of two code-execution flaws that can be triggered by the improper handling of maliciously crafted master fonts in the Adobe Type 1 Postscript format. Attackers can exploit them by convincing a target to open a booby-trapped document or viewing it in the Windows preview pane.


“Microsoft is aware of limited, targeted attacks that attempt to leverage this vulnerability,” Monday’s advisory warned. Elsewhere the advisory said: “For systems running supported versions of Windows 10 a successful attack could only result in code execution within an AppContainer sandbox context with limited privileges and capabilities.”


Microsoft didn’t say if the exploits are successfully executing malicious payloads or simply attempting it. Frequently, security defenses built into Windows prevent exploits from working as hackers intended. The advisory also made no reference to the volume or geographic locations of exploits. A fix is not yet available, and Monday’s advisory provided no indication when one would ship.

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