Threat Signal Report

ADV200006 | Type 1 Font Parsing Remote Code Execution Vulnerability

Description

Today, Microsoft issued an advisory titled ADV200006 | Type 1 Font Parsing Remote Code Execution Vulnerability. According to the advisory, this vulnerability could leverage unpatched vulnerabilities in the Adobe Type Manager Library for remote code execution.

What are the specifics of the vulnerability?
Specifics were not disclosed at this time. Noted in the advisory were two remote code execution vulnerabilities in Microsoft Windows and Windows Adobe Type Manager Library that improperly handles Adobe Type 1 PostScript format. According to Microsoft, the vulnerability can be exploited via the Windows Preview Pane.

Are there reports of active exploitation in the wild?
Yes.

How serious of an advisory is this?
Medium. Although this out of band advisory essentially allows for remote code execution, it is deemed Medium risk as exploitation has been limited to targeted attacks. According to Microsoft, there have been no reports of widespread exploitation at the time of this publication.

Is there a patch available at this time?
No.

What operating systems are affected?
Windows 10, Windows 7, Windows 8.1, Windows RT, Windows Server 2008, Windows Server 2012, Windows Server 2016 and Windows Server 2019 are affected.

Any suggested mitigations?
Microsoft has provided a long list of mitigation suggestions that is available on their ADV200006 advisory page. Please refer to the APPENDIX section for a link to the advisory.

What is the status of AV and IPS coverage?
IPS coverage for this issue was released in IPS definitions version 15.802:
MS.Win32k.Windows.GDI.Type.1.Font.Privilege.Escalation
AV coverage is not feasible for this issue.
FortiGuard Labs recommends that all AV and IPS definitions are kept up to date on a continual basis, and that organizations maintain a proactive patching routine when vendor updates are available. If it is deemed that patching is not feasible, it is recommended that a risk assessment is conducted to determine additional mitigation safeguards within an environment.

Telemetry


Definitions

Traffic Light Protocol

Color When Should it Be used? How may it be shared?

TLP: RED

Not for disclosure, restricted to participants only.
Sources may use TLP:RED when information cannot be effectively acted upon by additional parties, and could lead to impacts on a party's privacy, reputation, or operations if misused. Recipients may not share TLP:RED information with any parties outside of the specific exchange, meeting, or conversation in which it was originally disclosed. In the context of a meeting, for example, TLP:RED information is limited to those present at the meeting. In most circumstances, TLP:RED should be exchanged verbally or in person.

TLP: AMBER

Limited disclosure, restricted to participants’ organizations.
Sources may use TLP:AMBER when information requires support to be effectively acted upon, yet carries risks to privacy, reputation, or operations if shared outside of the organizations involved. Recipients may only share TLP:AMBER information with members of their own organization, and with clients or customers who need to know the information to protect themselves or prevent further harm. Sources are at liberty to specify additional intended limits of the sharing: these must be adhered to.

TLP: GREEN

Limited disclosure, restricted to the community.
Sources may use TLP:GREEN when information is useful for the awareness of all participating organizations as well as with peers within the broader community or sector. Recipients may share TLP:GREEN information with peers and partner organizations within their sector or community, but not via publicly accessible channels. Information in this category can be circulated widely within a particular community. TLP:GREEN information may not be released outside of the community.

TLP: WHITE

Disclosure is not limited.
Sources may use TLP:WHITE when information carries minimal or no foreseeable risk of misuse, in accordance with applicable rules and procedures for public release. Subject to standard copyright rules, TLP:WHITE information may be distributed without restriction.