CVE-2023-29483: Eventlet Denial of Service Vulnerability

MODERATE
Advisory Identifier: GHSA-3rq5-2g8h-59hc
Share
CVSS 5.9
CWE-696
Published
Advisory Summary

CVE-2023-29483 is a MODERATE (CVSS 5.9) denial of service vulnerability (CWE-696: Incorrect Behavior Order) affecting Eventlet libraries in the PyPI ecosystem. The issue involves potential dos via the tudoor mechanism in eventlet and dnspython. Remediation is available by upgrading affected packages to version 0.35.2, 2.6.1.

CVE-2023-29483 at a Glance

CVE Identifier CVE-2023-29483
GHSA Identifier GHSA-3rq5-2g8h-59hc
Severity MODERATE
CVSS v3.1 Base Score 5.9
CWE Classification CWE-696: Incorrect Behavior Order
Affected Product Eventlet
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 5.9

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H).

Attack Vector Network (AV:N)
Attack Complexity High (AC:H)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity None (I:N)
Availability High (A:H)

How to Fix CVE-2023-29483

To remediate this vulnerability, upgrade all affected Eventlet dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

eventlet fixed: 0.35.2 
pip install eventlet>=0.35.2
dnspython fixed: 2.6.1 
pip install dnspython>=2.6.1
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

pip show eventlet

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2023-29483, inspect your installed packages using pip:

pip show eventlet

Analyze the terminal output to locate any version of Eventlet in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.35.2), your application is affected.

Note: The pip show eventlet command checks currently installed packages in your active Python environment.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-696: Incorrect Behavior Order, where the product performs multiple related behaviors, but the behaviors are performed in the wrong order in ways that may produce resultant weaknesses. In Eventlet, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

eventlet before 0.35.2, as used in dnspython before 2.6.0, allows remote attackers to interfere with DNS name resolution by quickly sending an invalid packet from the expected IP address and source port, aka a "TuDoor" attack. In other words, dnspython does not have the preferred behavior in which the DNS name resolution algorithm would proceed, within the full time window, in order to wait for a valid packet. NOTE: dnspython 2.6.0 is unusable for a different reason that was addressed in 2.6.1.

CVE-2023-29483 Affected Eventlet Versions

2 component(s)
Fixed Versions:
0.35.22.6.1
Product / Package Ecosystem Affected Versions Fixed Version
eventlet
pypi/eventlet
PyPI
< 0.35.2
0.35.2
dnspython
pypi/dnspython
PyPI
< 2.6.1
2.6.1

References

NVD — CVE-2023-29483 NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-29483
Eventlet Source Repository REPOSITORY
https://github.com/eventlet/eventlet/issues/913
Eventlet Source Repository REPOSITORY
https://github.com/rthalley/dnspython/issues/1045
Security Fix Commit FIX COMMIT
https://github.com/eventlet/eventlet/commit/51e3c4928d4938beb576eff34f3bf97e6e64e6b4
Security Fix Commit FIX COMMIT
https://github.com/rthalley/dnspython/commit/0ea5ad0a4583e1f519b9bcc67cfac381230d9cf2
Eventlet Source Repository REPOSITORY
https://github.com/eventlet/eventlet
Eventlet Release RELEASE
https://github.com/eventlet/eventlet/releases/tag/v0.35.2
Eventlet Release RELEASE
https://github.com/rthalley/dnspython/releases/tag/v2.6.0
lists.fedoraproject.org/archives/list/packa... WEB
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NLRKR57IFVKQC2GCXZBFLCLBAWBWL3F6
lists.fedoraproject.org/archives/list/packa... WEB
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VOHJOO3OM65UIUUUVDEXMCTXNM6LXZEH
lists.fedoraproject.org/archives/list/packa... WEB
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/X3BNSIK5NFYSAP53Y45GOCMOQHHDLGIF
Eventlet Security Information SECURITY
https://security.netapp.com/advisory/ntap-20240510-0001
Eventlet Security Information SECURITY
https://security.snyk.io/vuln/SNYK-PYTHON-DNSPYTHON-6241713
www.dnspython.org WEB
https://www.dnspython.org

Frequently Asked Questions

What is CVE-2023-29483?
CVE-2023-29483 is a security vulnerability in Eventlet involving Potential DoS via the Tudoor mechanism in eventlet and dnspython under CWE-696: Incorrect Behavior Order.
Which Eventlet versions are affected?
Affected versions include releases prior to 0.35.2, 2.6.1 across affected packages: eventlet, dnspython.
What version fixes CVE-2023-29483?
Upgrading to 0.35.2, 2.6.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is eventlet affected?
Yes, eventlet is affected in releases prior to 0.35.2. Upgrade your dependency to 0.35.2 or later.
Is dnspython affected?
Yes, dnspython is affected in releases prior to 2.6.1. Upgrade your dependency to 2.6.1 or later.
What is the CVSS score of CVE-2023-29483?
CVE-2023-29483 has a CVSS v3.1 base score of 5.9 (MODERATE) with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with CVE-2023-29483?
CVE-2023-29483 is classified under CWE-696: Incorrect Behavior Order (The product performs multiple related behaviors, but the behaviors are performed in the wrong order in ways that may produce resultant weaknesses.).
How can I check PyPI dependencies for CVE-2023-29483?
Run the dependency tree command: 'pip show eventlet'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-3rq5-2g8h-59hc",
  "modified" : "2024-06-26T03:31:48Z",
  "published" : "2024-04-11T15:30:48Z",
  "aliases" : [ "CVE-2023-29483" ],
  "summary" : "Potential DoS via the Tudoor mechanism in eventlet and dnspython",
  "details" : "eventlet before 0.35.2, as used in dnspython before 2.6.0, allows remote attackers to interfere with DNS name resolution by quickly sending an invalid packet from the expected IP address and source port, aka a \"TuDoor\" attack. In other words, dnspython does not have the preferred behavior in which the DNS name resolution algorithm would proceed, within the full time window, in order to wait for a valid packet. NOTE: dnspython 2.6.0 is unusable for a different reason that was addressed in 2.6.1.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "eventlet"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.35.2"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "dnspython"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2.6.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2023-29483"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/eventlet/eventlet/issues/913"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/rthalley/dnspython/issues/1045"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/eventlet/eventlet/commit/51e3c4928d4938beb576eff34f3bf97e6e64e6b4"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/rthalley/dnspython/commit/0ea5ad0a4583e1f519b9bcc67cfac381230d9cf2"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/eventlet/eventlet"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/eventlet/eventlet/releases/tag/v0.35.2"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/rthalley/dnspython/releases/tag/v2.6.0"
  }, {
    "type" : "WEB",
    "url" : "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NLRKR57IFVKQC2GCXZBFLCLBAWBWL3F6"
  }, {
    "type" : "WEB",
    "url" : "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VOHJOO3OM65UIUUUVDEXMCTXNM6LXZEH"
  }, {
    "type" : "WEB",
    "url" : "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/X3BNSIK5NFYSAP53Y45GOCMOQHHDLGIF"
  }, {
    "type" : "WEB",
    "url" : "https://security.netapp.com/advisory/ntap-20240510-0001"
  }, {
    "type" : "WEB",
    "url" : "https://security.snyk.io/vuln/SNYK-PYTHON-DNSPYTHON-6241713"
  }, {
    "type" : "WEB",
    "url" : "https://www.dnspython.org"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-696" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2024-04-12T21:25:53Z",
    "nvd_published_at" : "2024-04-11T14:15:12Z"
  }
}