CVE-2024-35221

Denial of service when publishing a package on rubygems.org

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.

Category

4.3
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.21%
Affected: rubygems rubygems.org
Published at:
Updated at:

References

Link Tags
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

Frequently Asked Questions

What is the severity of CVE-2024-35221?
CVE-2024-35221 has been scored as a medium severity vulnerability.
How to fix CVE-2024-35221?
To fix CVE-2024-35221, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2024-35221 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2024-35221 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2024-35221?
CVE-2024-35221 affects rubygems rubygems.org.
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