Two new zero-day vulnerabilities enable BitLocker bypass and privilege escalation through Windows translation framework.
Summary
- Anonymous researcher disclosed two Windows zero-day vulnerabilities codenamed YellowKey and GreenPlasma
- YellowKey enables BitLocker bypass, while GreenPlasma allows privilege escalation via Windows CTFMON
- Same researcher previously disclosed three Microsoft Defender vulnerabilities
An anonymous cybersecurity researcher has disclosed two new zero-day vulnerabilities affecting Windows systems. The flaws enable attackers to bypass BitLocker encryption and escalate privileges through the Windows Collaborative Translation Framework (CTFMON).
The researcher, operating under the alias Chaotic Eclipse, has designated the vulnerabilities YellowKey and GreenPlasma respectively, according to The Hacker News.
YellowKey represents a significant security concern as it allows attackers to bypass BitLocker, Microsoft’s disk encryption technology designed to protect data on Windows devices. The vulnerability could potentially expose encrypted data to unauthorised access.
GreenPlasma targets the Windows Collaborative Translation Framework, enabling privilege escalation attacks. CTFMON is a Windows system process that supports language input methods and text services.
This disclosure follows the same researcher’s previous work exposing three Microsoft Defender vulnerabilities. The pattern suggests ongoing systematic analysis of Microsoft’s security implementations.
Microsoft has not yet publicly responded to these disclosures. The timeline for patches remains unclear given the zero-day status of both vulnerabilities.
Why It Matters
BitLocker bypass vulnerabilities directly threaten data protection controls that many organisations rely on for compliance and data security. CISOs should prepare for potential emergency patching and consider interim risk mitigation strategies for systems using BitLocker encryption.
The privilege escalation component adds lateral movement risk within Windows environments, potentially amplifying the impact of initial compromises across enterprise networks.
What To Do Now
- Monitor Microsoft security advisories for official patches addressing YellowKey and GreenPlasma vulnerabilities
- Review current BitLocker implementation and consider additional endpoint protection layers
- Assess privilege escalation controls on Windows systems running CTFMON
