CVE-2024-35221
A Gem publisher can cause a Remote DoS when publishing a Gem.
Does this matter?
Lower severity and a low EPSS score (0.49%). Track it; it rarely justifies an emergency change on its own.
Description
Rubygems.org is the Ruby community's gem hosting service. A Gem publisher can cause a Remote DoS when publishing a Gem. This is due to how Ruby reads the Manifest of Gem files when using Gem::Specification.from_yaml. from_yaml makes use of SafeYAML.load which allows YAML aliases inside the YAML-based metadata of a gem. YAML aliases allow for Denial of Service attacks with so-called `YAML-bombs` (comparable to Billion laughs attacks). This was patched. There is is no action required by users. This issue is also tracked as GHSL-2024-001 and was discovered by the GitHub security lab.
- CVSS 3.1
- 4.3 MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
- EPSS
- 0.49% probability · 41th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-400
- Source
- security-advisories@github.com
References
- https://en.wikipedia.org/wiki/Billion_laughs_attack
- https://github.com/ruby/ruby/blob/7cf74a2ff28b1b4c26e367d0d67521f7e1fed239/lib/rubygems/safe_yaml.rb#L28
- https://github.com/rubygems/rubygems.org/security/advisories/GHSA-4vc5-whwr-7hh2
- https://en.wikipedia.org/wiki/Billion_laughs_attack
- https://github.com/ruby/ruby/blob/7cf74a2ff28b1b4c26e367d0d67521f7e1fed239/lib/rubygems/safe_yaml.rb#L28
- https://github.com/rubygems/rubygems.org/security/advisories/GHSA-4vc5-whwr-7hh2
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.