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THREATINT
PUBLISHED

CVE-2022-31163

TZInfo relative path traversal vulnerability allows loading of arbitrary files



Description

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`.

Reserved 2022-05-18 | Published 2022-07-21 | Updated 2024-09-05 | Assigner GitHub_M


HIGH: 7.5CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Problem types

CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

CWE-23: Relative Path Traversal

Product status

< 0.3.61
affected

>= 1.0.0, < 1.2.10
affected

References

github.com/...tzinfo/security/advisories/GHSA-5cm2-9h8c-rvfx

github.com/tzinfo/tzinfo/releases/tag/v0.3.61

github.com/tzinfo/tzinfo/releases/tag/v1.2.10

github.com/...ommit/9eddbb5c0e682736f61d0dd803b6031a5db9eadf

github.com/...ommit/9905ca93abf7bf3e387bd592406e403cd18334c7

lists.debian.org/debian-lts-announce/2022/08/msg00009.html ([debian-lts-announce] 20220818 [SECURITY] [DLA 3077-1] ruby-tzinfo security update) mailing-list

cve.org (CVE-2022-31163)

nvd.nist.gov (CVE-2022-31163)

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