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Bug #19296
closed
Time.new's argument check is incomplete
Status:
Closed
Assignee:
-
Target version:
-
ruby -v:
ruby 3.3.0dev (2023-01-01T07:39:00Z master 542e984d82) +YJIT [arm64-darwin21]
Description
Time.new seems to be performing some sort of argument checking, but I found some strings that can bypass this validation and craft erroneous Time value.
- month
'12'.upto('20').each do |m|
str = "2023-#{m}-01"
puts str
begin
p Time.new str
rescue => e
p e
end
puts
end
# result
2023-12-01
2023-12-01 00:00:00 +0900
2023-13-01
#<ArgumentError: mon out of range>
2023-14-01
#<ArgumentError: mon out of range>
2023-15-01
#<ArgumentError: mon out of range>
2023-16-01
#<ArgumentError: mon out of range>
2023-17-01
2023-01-01 00:00:00 +0900
2023-18-01
2023-02-01 00:00:00 +0900
2023-19-01
2023-03-01 00:00:00 +0900
2023-20-01
2023-04-01 00:00:00 +0900
- day
$ ruby -e 'p Time.new("2023-01-31")'
2023-01-31 00:00:00 +0900
$ ruby -e 'p Time.new("2023-01-32")'
<internal:timev>:398:in `initialize': mday out of range (ArgumentError)
from -e:1:in `new'
from -e:1:in `<main>'
$ ruby -e 'p Time.new("2023-01-33")'
2023-01-01 00:00:00 +0900
$ ruby -e 'p Time.new("2023-01-34")
2023-01-02 00:00:00 +0900
In conclusion, month seeems to raise only when the given value is <= 16, and day seems to be checked for <= 32 only.
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