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CVE-2020-3977: VMware Horizon DaaS Broken Authentication (MFA Bypass)

Not long ago, I assisted a client of ours with a penetration test of their VMware Horizon remote access solution and discovered a vulnerability affecting how it handles Multi-Factor Authentication (MFA). As a result, with a compromised user account password, I could gain access to the organisations internal network from the internet, bypassing the MFA requirement. In this blog, I’ll provide a high-level summary and explain how I identified and exploited the vulnerability.

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