Ruby is an extensible, interpreted, object-oriented, scripting language. Ithas features to process text files and to do system management tasks.A flaw was found in the way large amounts of memory were allocated on64-bit systems when using the BigDecimal class. A context-dependentattacker could use this flaw to cause memory corruption, causing a Rubyapplication that uses the BigDecimal class to crash or, possibly, executearbitrary code. This issue did not affect 32-bit systems. (CVE-2011-0188)A race condition flaw was found in the remove system entries method in theFileUtils module. If a local user ran a Ruby script that uses this method,a local attacker could use this flaw to delete arbitrary files anddirectories accessible to that user via a symbolic link attack.(CVE-2011-1004)A flaw was found in the method for translating an exception message into astring in the Exception class. A remote attacker could use this flaw tobypass safe level 4 restrictions, allowing untrusted (tainted) code tomodify arbitrary, trusted (untainted) strings, which safe level 4restrictions would otherwise prevent. (CVE-2011-1005)Red Hat would like to thank Drew Yao of Apple Product Security forreporting the CVE-2011-0188 issue.All Ruby users should upgrade to these updated packages, which containbackported patches to resolve these issues.