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CVE-2022-31163: Release v0.3.61 · tzinfo/tzinfo
TZInfo is a Ruby library that provides access to time zone data and allows times to be converted using time zone rules. Versions prior to 0.36.1, as well as those prior to 1.2.10 when used with the Ruby data source tzinfo-data, are vulnerable to relative path traversal. With the Ruby data source, time zones are defined in Ruby files. There is one file per time zone. Time zone files are loaded with require on demand. In the affected versions, TZInfo::Timezone.get fails to validate time zone identifiers correctly, allowing a new line character within the identifier. With Ruby version 1.9.3 and later, TZInfo::Timezone.get can be made to load unintended files with require, executing them within the Ruby process. Versions 0.3.61 and 1.2.10 include fixes to correctly validate time zone identifiers. Versions 2.0.0 and later are not vulnerable. Version 0.3.61 can still load arbitrary files from the Ruby load path if their name follows the rules for a valid time zone identifier and the file has a prefix of tzinfo/definition within a directory in the load path. Applications should ensure that untrusted files are not placed in a directory on the load path. As a workaround, the time zone identifier can be validated before passing to TZInfo::Timezone.get by ensuring it matches the regular expression \A[A-Za-z0-9+\-_]+(?:\/[A-Za-z0-9+\-_]+)*\z.
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philr released this
· 724 commits to master since this release
v0.3.61
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- Fixed a relative path traversal bug that could cause arbitrary files to be loaded with require from the Ruby load path. Please refer to GHSA-5cm2-9h8c-rvfx for details. CVE-2022-31163.
- Updated to tzdata version 2022a (https://mm.icann.org/pipermail/tz-announce/2022-March/000070.html).
TZInfo v0.3.61 on RubyGems.org
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### Impact #### Affected versions - 0.3.60 and earlier. - 1.0.0 to 1.2.9 when used with the Ruby data source (tzinfo-data). #### Vulnerability With the Ruby data source (the tzinfo-data gem for tzinfo version 1.0.0 and later and built-in to earlier versions), time zones are defined in Ruby files. There is one file per time zone. Time zone files are loaded with `require` on demand. In the affected versions, `TZInfo::Timezone.get` fails to validate time zone identifiers correctly, allowing a new line character within the identifier. With Ruby version 1.9.3 and later, `TZInfo::Timezone.get` can be made to load unintended files with `require`, executing them within the Ruby process. For example, with version 1.2.9, you can run the following to load a file with path `/tmp/payload.rb`: ```ruby TZInfo::Timezone.get("foo\n/../../../../../../../../../../../../../../../../tmp/payload") ``` The exact number of parent directory traversals needed will vary depending on the location of t...