|Ruby 1.8.5 and earlier, 1.8.6 through 1.8.6-p286, 1.8.7 through
1.8.7-p71, and 1.9 through r18423 does not properly restrict access to
critical variables and methods at various safe levels, which allows
context-dependent attackers to bypass intended access restrictions via
(1) untrace_var, (2) $PROGRAM_NAME, and (3) syslog at safe level 4,
and (4) insecure methods at safe levels 1 through 3.