Adobe Type Manager Library Font Parsing Remote Code Execution Vulnerabilities Exploited in the Wild (ADV200006)
Microsoft releases an out-of-band advisory for remote code execution vulnerabilities being actively exploited in the wild.
Update April 14, 2020: Microsoft has updated its advisory with reference to CVE-2020-1020, and our solution section has been updated as well.
Contexto
On March 23, Microsoft released an advisory for two vulnerabilities in Adobe Type Manager (ATM) Library, an integrated PostScript font library found in all versions of Windows. Although the name of the ATM library came from an Adobe developed tool, ATM Light, Microsoft included native support for the ATM fonts with the release of Windows Vista in 2007. These vulnerabilities therefore exist within Windows’ native integration for support of PostScript fonts.
To be clear and despite its name, this is *not* Adobe code. Microsoft was given the source code for ATM Light for inclusion in Windows 2000/XP. After that, Microsoft took 100% responsibility for maintaining the code.
— Rosyna Keller (@rosyna) March 23, 2020
Exploitation of these vulnerabilities could result in code execution on affected systems. Users are urged to implement Microsoft’s suggested workarounds to reduce risk until a patch is available.
Análise
According to the advisory, an attacker could gain code execution on a vulnerable machine after a user on that machine opened a specially crafted document or viewed that document in the Windows Preview pane.
The vulnerabilities exist within the way that Windows parses OpenType fonts. Successful exploitation would require an attacker to convince a user to open a malicious document or visit a malicious page that exploits the WebClient service which is normally listening for WebDAV file shares.
Microsoft also states: “The threat is low for those systems running Windows 10 due to mitigations that were put in place with the first version released in 2015. Please see the mitigation section for details. Microsoft is not aware of any attacks against the Windows 10 platform. The possibility of remote code execution is negligible and elevation of privilege is not possible. We do not recommend that IT administrators running Windows 10 implement the workarounds described below.”
Prova de conceito
There are no known public proofs of concepts available for these vulnerabilities at this time, but Microsoft notes it is aware of “limited targeted Windows 7 based attacks” exploiting these vulnerabilities in the wild.
Vendor response
Microsoft released its advisory outside of the normal update cycle to provide workarounds.
Solução
Microsoft offers several workarounds, including disabling the Preview pane and Details pane in Windows Explorer, disabling the WebClient service and renaming the Adobe Type Manager Font Driver dll file (ATMFD.dll). For the full details on the workarounds and their impact, please review the Workarounds section of the advisory. Organizations should deploy those workarounds as necessary. An update to fix this vulnerability was released in Microsoft's April 2020 Patch Tuesday and can be found here.
Identificação de sistemas afetados
A list of Tenable plugins to identify these vulnerabilities can be found here.
Obtenha mais informações
Junte-se à equipe de resposta de segurança da Tenable na Tenable.
Saiba mais sobre a Tenable, a primeira plataforma de Cyber Exposure para o gerenciamento holístico da sua superfície de ataque moderna.
Obtenha uma avaliação gratuita por 30 dias do Vulnerability Management da Tenable.io.
Artigos relacionados
Operational Technology in the DoD: Ensuring a Secure and Efficient Power Grid
April 19, 2024In an evolving threat landscape, the DoD must make sure that its mission-critical operations don’t experience power outages.
Strengthening the Nessus Software Supply Chain with SLSA
April 16, 2024You know Tenable as a cybersecurity industry leader whose world-class exposure management products are trusted by our approximately 43,000 customers, including about 60% of the Fortune 500. But sometimes we like to give you a peek behind the curtain to share how we protect our own house against cyberattacks – and that’s what this blog is about. Today we’re sharing our experience adopting the supply-chain security framework SLSA, with the hopes that the lessons we learned will be helpful to you.
Cybersecurity Snapshot: CISA Says Midnight Blizzard Swiped U.S. Gov’t Emails During Microsoft Hack, Tells Fed Agencies To Take Immediate Action
April 12, 2024Check out CISA’s urgent call for federal agencies to protect themselves from Midnight Blizzard’s breach of Microsoft corporate emails. Plus, a new survey shows cybersecurity pros are guardedly optimistic about AI. Meanwhile, SANS pinpoints the four trends CISOs absolutely must focus on this year. And the NSA is sharing best practices for data security. And much more!
Operational Technology in the DoD: Ensuring a Secure and Efficient Power Grid
April 19, 2024In an evolving threat landscape, the DoD must make sure that its mission-critical operations don’t experience power outages.
Cybersecurity Snapshot: Cyber Agencies Offer Secure AI Tips, while Stanford Issues In-Depth AI Trends Analysis, Including of AI Security
April 19, 2024Check out recommendations for securing AI systems from the Five Eyes cybersecurity agencies. Plus, Stanford University offers a comprehensive review of AI trends. Meanwhile, a new open-source tool aims to simplify SBOM usage. And don’t miss the latest CIS Benchmarks updates. And much more!
Tenable and Thales Collaborate to Provide Cyber Defense Simulations to Better Secure Operational Technology Environments
April 18, 2024The heart of the Welsh Valleys is home to the Thales Ebbw Vale campus, a world-class facility jointly funded by the Welsh government as part of its regeneration program for the region. At the core of the facility is the Cyber Range, a simulation and virtualization platform for training, testing, exercising and R&D. Tenable has joined the lineup of solutions used to run real world simulations in this controlled environment.
- Vulnerability Management