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CERN HTTPD access control bypass
Information
Severity
Severity
Medium
Family
Family
Web Servers
CVSSv2 Base
CVSSv2 Base
5.0
CVSSv2 Vector
CVSSv2 Vector
AV:N/AC:L/Au:N/C:P/I:N/A:N
Solution Type
Solution Type
Workaround
Created
Created
18 years ago
Modified
Modified
5 years ago
Summary
It is possible to access protected web pages by changing / with // or /./ This was a bug in old versions of CERN web server.
Solution
Solution
Upgrade your web server or tighten your filtering rules. A workaround consisted in rejecting patterns like: //* *//* /./* */./*