Red Hat Security Advisory 2012-0070-01 - Ruby is an extensible, interpreted, object-oriented, scripting language. It has features to process text files and to do system management tasks. A denial of service flaw was found in the implementation of associative arrays in Ruby. An attacker able to supply a large number of inputs to a Ruby application that are used as keys when inserting data into an array could trigger multiple hash function collisions, making array operations take an excessive amount of CPU time. To mitigate this issue, randomization has been added to the hash function to reduce the chance of an attacker successfully causing intentional collisions.
03b3e4cae76347af80bc92c207769ad0a2a84889ef025d717522605f2284e476Red Hat Security Advisory 2011-1581-03 - Ruby is an extensible, interpreted, object-oriented, scripting language. It has features to process text files and to do system management tasks. It was found that Ruby did not reinitialize the PRNG after forking a child process. This could eventually lead to the PRNG returning the same result twice. An attacker keeping track of the values returned by one child process could use this flaw to predict the values the PRNG would return in other child processes. A flaw was found in the Ruby SecureRandom module. When using the SecureRandom.random_bytes class, the PRNG state was not modified after forking a child process. This could eventually lead to SecureRandom.random_bytes returning the same string more than once. An attacker keeping track of the strings returned by one child process could use this flaw to predict the strings SecureRandom.random_bytes would return in other child processes.
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