Bug 857840 – <dev-ruby/rails-{5.2.8.1,6.0.5.1,6.1.6.1,7.0.3.1}: Possible RCE escalation bug with Serialized Columns in Active Record

• Status: IN_PROGRESS
• Product: Gentoo Security

[Description Hans de Graaff 2022-07-13 05:18:47 UTC]

There is a possible escalation to RCE when using YAML serialized columns in Active Record. This vulnerability has been assigned the CVE identifier CVE-2022-32224.

Versions Affected: All. Not affected: None Fixed Versions: 7.0.3.1, 6.1.6.1, 6.0.5.1, 5.2.8.1
Impact

When serialized columns that use YAML (the default) are deserialized, Rails uses YAML.unsafe_load to convert the YAML data in to Ruby objects. If an attacker can manipulate data in the database (via means like SQL injection), then it may be possible for the attacker to escalate to an RCE.

Impacted Active Record models will look something like this:

class User < ApplicationRecord
  serialize :options       # Vulnerable: Uses YAML for serialization
  serialize :values, Array # Vulnerable: Uses YAML for serialization
  serialize :values, JSON  # Not vulnerable
end

All users running an affected release should either upgrade or use one of the workarounds immediately.
Releases

The FIXED releases are available at the normal locations.

The released versions change the default YAML deserializer to use YAML.safe_load, which prevents deserialization of possibly dangerous objects. This may introduce backwards compatibility issues with existing data.

[Comment 1 Hans de Graaff 2022-07-13 07:11:55 UTC]

Fixed versions 7.0.3.1, 6.1.6.1, 6.0.5.1, 5.2.8.1 have been added.

[Comment 2 John Helmert III 2022-07-13 17:56:23 UTC]

Thanks! Please stable when ready.

[Comment 3 John Helmert III 2022-07-19 21:14:46 UTC]

Please cleanup

[Comment 4 Hans de Graaff 2022-07-20 07:37:27 UTC]

Cleanup done.

[Comment 5 John Helmert III 2022-07-21 22:30:34 UTC]

Thanks!