var-199907-0036
Vulnerability from variot

IIS 3.x and 4.x does not distinguish between pages requiring encryption and those that do not, which allows remote attackers to cause a denial of service (resource exhaustion) via SSL requests to the HTTPS port for normally unencrypted files, which will cause IIS to perform extra work to send the files over SSL. NT Servers running IIS with SSL security enabled are susceptible to a DoS attack due to the server's inability to differentiate between pages that require SSL and those that don't. Therefore, by replacing the 'http' string in the URL with 'https' the server can be forced to encrypt any content in the web site, including high-bandwidth pages. An attacker could, with carefully planned https requests, drive the processor utilization to 100% resulting in extreme slowdown or even failure of the server

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