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Vulnerability · Published Jul 21, 2022 · Assigned by GitHub_M

CVE-2022-31163TZInfo relative path traversal vulnerability allows loading of arbitrary files

High 7.5

In plain English

A high-severity path traversal in tzinfo from tzinfo. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 2.4% (higher than 84% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.5High
Exploit odds (30 days)2.4%top 15.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official 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`.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12ruby-tzinfo2.0.4-2DEBIAN-CVE-2022-31163
Debian:13ruby-tzinfo2.0.4-2DEBIAN-CVE-2022-31163
Debian:14ruby-tzinfo2.0.4-2DEBIAN-CVE-2022-31163
RubyGemstzinfo0.3.61GHSA-5cm2-9h8c-rvfx
RubyGemstzinfo1.2.10GHSA-5cm2-9h8c-rvfx
Ubuntu:22.04:LTSruby-tzinfono fix listedUBUNTU-CVE-2022-31163
Ubuntu:24.04:LTSruby-tzinfono fix listedUBUNTU-CVE-2022-31163
Ubuntu:25.10ruby-tzinfono fix listedUBUNTU-CVE-2022-31163
Ubuntu:26.04:LTSruby-tzinfono fix listedUBUNTU-CVE-2022-31163
Ubuntu:26.10ruby-tzinfono fix listedUBUNTU-CVE-2022-31163

Affected products (as reported)

VendorProductVersions
tzinfo tzinfo < 0.3.61>= 1.0.0, < 1.2.10

Weakness: CWE-22, CWE-23 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

References