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Windows RDP is a mechanism for doing remote GUI logins to a Dimdows
machine. It turns out that RDP has a “feature” whereby it continues to allow you to log in using an old password, even after that password
has been revoked.
Microsoft doesn’t seem to see this as a security issue at all:
In response, Microsoft said the behavior is a “a design decision
to ensure that at least one user account always has the ability to
log in no matter how long a system has been offline.” As such,
Microsoft said the behavior doesn’t meet the definition of a
security vulnerability, and company engineers have no plans to
change it.
Not only that, the problem had been reported to the company by another security researcher nearly two years earlier:
"We originally looked at a code change for this issue, but after
further review of design documentation, changes to code could
break compatibility with functionality used by many applications."
<https://arstechnica.com/security/2025/04/windows-rdp-lets-you-log-in-using-revoked-passwords-microsoft-is-ok-with-that/>
Windows RDP is a mechanism for doing remote GUI logins to a Dimdows
machine. It turns out that RDP has a “feature” whereby it continues to allow you to log in using an old password, even after that password
has been revoked.
Microsoft doesn’t seem to see this as a security issue at all:
In response, Microsoft said the behavior is a “a design decision
to ensure that at least one user account always has the ability to
log in no matter how long a system has been offline.” As such,
Microsoft said the behavior doesn’t meet the definition of a
security vulnerability, and company engineers have no plans to
change it.
Not only that, the problem had been reported to the company by another security researcher nearly two years earlier:
"We originally looked at a code change for this issue, but after
further review of design documentation, changes to code could
break compatibility with functionality used by many applications."
<https://arstechnica.com/security/2025/04/windows-rdp-lets-you-log-in-using-revoked-passwords-microsoft-is-ok-with-that/>