Vulnerability-Lookup

SUSE-SU-2021:2761-1

Vulnerability from csaf_suse - Published: 2021-08-17 15:12 - Updated: 2021-08-17 15:12

Summary

Security update for rubygem-puma

Severity

Important

Notes

Title of the patch: Security update for rubygem-puma

Description of the patch: This update for rubygem-puma fixes the following issues: - CVE-2021-29509: Incomplete fix for CVE-2019-16770 allows Denial of Service (bsc#1188527)

Patchnames: SUSE-2021-2761,SUSE-OpenStack-Cloud-Crowbar-8-2021-2761

CVE-2021-29509

7.5 (High)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

Recommended 1 product

Product	Identifier	Version	Remediation
Unresolved product id: SUSE OpenStack Cloud Crowbar 8:ruby2.1-rubygem-puma-2.16.0-3.12.1.x86_64		—	Vendor Fix

Threats

Impact important

References

8 references

URL	Category
https://www.suse.com/support/security/rating/	external
https://ftp.suse.com/pub/projects/security/csaf/s…	self
https://www.suse.com/support/update/announcement/…	self
https://lists.suse.com/pipermail/sle-security-upd…	self
https://bugzilla.suse.com/1188527	self
https://www.suse.com/security/cve/CVE-2021-29509/	self
https://www.suse.com/security/cve/CVE-2021-29509	external
https://bugzilla.suse.com/1188527	external

JSON

To clipboard

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CVE-2021-29509 (GCVE-0-2021-29509)

Vulnerability from cvelistv5 – Published: 2021-05-11 16:50 – Updated: 2024-08-03 22:11

Title

Keepalive Connections Causing Denial Of Service in puma

Summary

Puma is a concurrent HTTP 1.1 server for Ruby/Rack applications. The fix for CVE-2019-16770 was incomplete. The original fix only protected existing connections that had already been accepted from having their requests starved by greedy persistent-connections saturating all threads in the same process. However, new connections may still be starved by greedy persistent-connections saturating all threads in all processes in the cluster. A `puma` server which received more concurrent `keep-alive` connections than the server had threads in its threadpool would service only a subset of connections, denying service to the unserved connections. This problem has been fixed in `puma` 4.3.8 and 5.3.1. Setting `queue_requests false` also fixes the issue. This is not advised when using `puma` without a reverse proxy, such as `nginx` or `apache`, because you will open yourself to slow client attacks (e.g. slowloris). The fix is very small and a git patch is available for those using unsupported versions of Puma.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE

CWE-400 - {"CWE-400":"Uncontrolled Resource Consumption"}

Assigner

GitHub_M mitre root

References

6 references

URL	Tags
https://github.com/puma/puma/security/advisories/…	x_refsource_CONFIRM
https://gist.github.com/nateberkopec/4b3ea5676c0d…	x_refsource_MISC
https://github.com/puma/puma/security/policy	x_refsource_MISC
https://rubygems.org/gems/puma	x_refsource_MISC
https://security.gentoo.org/glsa/202208-28	vendor-advisoryx_refsource_GENTOO
https://lists.debian.org/debian-lts-announce/2022…	mailing-listx_refsource_MLIST

Impacted products

1 product

Vendor	Product	Version
puma	puma	Affected: < 4.3.8 Affected: >= 5.0.0, < 5.3.1

Show details on NVD website

JSON

To clipboard

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            },
            {
              "name": "https://rubygems.org/gems/puma",
              "refsource": "MISC",
              "url": "https://rubygems.org/gems/puma"
            },
            {
              "name": "GLSA-202208-28",
              "refsource": "GENTOO",
              "url": "https://security.gentoo.org/glsa/202208-28"
            },
            {
              "name": "[debian-lts-announce] 20220827 [SECURITY] [DLA 3083-1] puma security update",
              "refsource": "MLIST",
              "url": "https://lists.debian.org/debian-lts-announce/2022/08/msg00015.html"
            }
          ]
        },
        "source": {
          "advisory": "GHSA-q28m-8xjw-8vr5",
          "discovery": "UNKNOWN"
        }
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2021-29509",
    "datePublished": "2021-05-11T16:50:11.000Z",
    "dateReserved": "2021-03-30T00:00:00.000Z",
    "dateUpdated": "2024-08-03T22:11:05.438Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.