Microsoft Windows up to Server 2019 Type 1 Font Parser privileges management

Summaryinfo

A vulnerability was found in Microsoft Windows. It has been rated as critical. Affected by this vulnerability is an unknown functionality of the component Type 1 Font Parser. The manipulation leads to privileges management. Remote exploitation of the attack is possible. Furthermore, an exploit is available. It is preferable to disable the affected component.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Microsoft Windows (Operating System). This issue affects an unknown function of the component Type 1 Font Parser. The manipulation with an unknown input leads to a privileges management vulnerability. Using CWE to declare the problem leads to CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. Impacted is confidentiality, integrity, and availability.

The weakness was published 03/23/2020 as ADV200006 (Website). It is possible to read the advisory at portal.msrc.microsoft.com. The vendor was not involved in the public release. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. Technical details are unknown but a private exploit is available. The pricing for an exploit might be around USD $25k-$100k at the moment (estimation calculated on 03/24/2020). The attack technique deployed by this issue is T1068 according to MITRE ATT&CK. The advisory points out:

Microsoft is aware of limited targeted attacks that could leverage un-patched vulnerabilities in the Adobe Type Manager Library, and is providing the following guidance to help reduce customer risk until the security update is released.

It is declared as highly functional. The advisory illustrates:

Two remote code execution vulnerabilities exist in Microsoft Windows when the Windows Adobe Type Manager Library improperly handles a specially-crafted multi-master font - Adobe Type 1 PostScript format.

The best possible mitigation is suggested to be disabling the affected component. The advisory contains the following remark:

Microsoft is aware of this vulnerability and working on a fix. Updates that address security vulnerabilities in Microsoft software are typically released on Update Tuesday, the second Tuesday of each month. This predictable schedule allows for partner quality assurance and IT planning, which helps maintain the Windows ecosystem as a reliable, secure choice for our customers. The operating system versions that are affected by this vulnerability are listed below. Please see the mitigation and workarounds for guidance on how to reduce the risk.

arstechnica.com is providing further details. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

• Operating System

Vendor

• Microsoft

Name

• Windows

Version

• 7 SP1
• 8.1
• 10
• 10 1607
• 10 1709
• 10 1803
• 10 1809
• 10 1903
• 10 1909
• RT 8.1
• Server 2008 R2 SP1
• Server 2008 SP2
• Server 2012
• Server 2012 R2
• Server 2016
• Server 2019

License

• commercial

Website

• Vendor: https://www.microsoft.com/
• Product: https://www.microsoft.com/en-us/windows

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