CVE-2008-2726 ruby: integer overflow in rb_ary_splice/update/replace() - beg + rlen

Integer overflow in the (1) rb_ary_splice function in Ruby 1.8.4
and earlier, 1.8.5 before 1.8.5-p231, 1.8.6 before 1.8.6-p230,
1.8.7 before 1.8.7-p22, and 1.9.0 before 1.9.0-2; and (2) the
rb_ary_replace function in 1.6.x allows context-dependent
attackers to trigger memory corruption, aka the “beg + rlen” issue.

NOTE: As of 20080624, there has been inconsistent usage of multiple
CVE identifiers related to Ruby. The CVE description should be
regarded as authoritative, although it is likely to change.