Ruby: CVSS (Max): None

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2023.1902
                CVE-2023-28756: ReDoS vulnerability in Time
                               31 March 2023

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Ruby
Publisher:         Ruby
Operating System:  UNIX variants (UNIX, Linux, OSX)
                   Windows
Resolution:        Patch/Upgrade
CVE Names:         CVE-2023-28756  

Original Bulletin: 
   https://www.ruby-lang.org/en/news/2023/03/30/redos-in-time-cve-2023-28756/

Comment: CVSS (Max):  None available when published

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CVE-2023-28756: ReDoS vulnerability in Time

Posted by hsbt on 30 Mar 2023

We have released the time gem version 0.1.1 and 0.2.2 that has a security fix
for a ReDoS vulnerability. This vulnerability has been assigned the CVE
identifier CVE-2023-28756 .

Details

The Time parser mishandles invalid strings that have specific characters. It
causes an increase in execution time for parsing strings to Time objects.

A ReDoS issue was discovered in the Time gem 0.1.0 and 0.2.1 and Time library
of Ruby 2.7.7.

Recommended action

We recommend to update the time gem to version 0.2.2 or later. In order to
ensure compatibility with bundled version in older Ruby series, you may update
as follows instead:

  o For Ruby 3.0 users: Update to time 0.1.1
  o For Ruby 3.1/3.2 users: Update to time 0.2.2

You can use gem update time to update it. If you are using bundler, please add
gem "time", ">= 0.2.2" to your Gemfile .

Unfortunately, time gem only works with Ruby 3.0 or later. If you are using
Ruby 2.7, please use the latest version of Ruby.

Affected versions

  o Ruby 2.7.7 or lower
  o time gem 0.1.0
  o time gem 0.2.1

Credits

Thanks to ooooooo_q for discovering this issue.

History

  o Originally published at 2023-03-30 11:00:00 (UTC)

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