[Hanno Böck] recently uncovered a vulnerability in Apache webserver, affecting Apache HTTP Server 2.2.x through 2.2.34 and 2.4.x through 2.4.27. This bug only affects Apache servers with a certain configuration in .htaccess
file. Dubbed Optionsbleed, this vulnerability is a use after free error in Apache HTTP that causes a corrupted Allow header to be replied by the webserver in response to HTTP OPTIONS requests. This can leak pieces of arbitrary memory from the server process that may contain sensitive information. The memory pieces change after multiple requests, so for a vulnerable host an arbitrary number of memory chunks can be …read more
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