CVE-2020-7658: Meinheld Meinheld Vulnerable To HTTP Request Vulnerability

MODERATE
Advisory Identifier: GHSA-63h2-9cc8-fc7m
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CVSS 6.1
CWE-444
Published
Advisory Summary

CVE-2020-7658 is a MODERATE (CVSS 6.1) meinheld vulnerable to http request vulnerability (CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')) affecting Meinheld libraries in the PyPI ecosystem. The issue involves meinheld vulnerable to http request smuggling. Remediation is available by upgrading affected packages to version 1.0.2.

CVE-2020-7658 at a Glance

CVE Identifier CVE-2020-7658
GHSA Identifier GHSA-63h2-9cc8-fc7m
Severity MODERATE
CVSS v3.1 Base Score 6.1
CWE Classification CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Affected Product Meinheld
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 6.1

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

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction Required (UI:R)
Scope Changed (S:C)
Confidentiality Low (C:L)
Integrity Low (I:L)
Availability None (A:N)

How to Fix CVE-2020-7658

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

meinheld fixed: 1.0.2 
pip install meinheld>=1.0.2
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 meinheld

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2020-7658, inspect your installed packages using pip:

pip show meinheld

Analyze the terminal output to locate any version of Meinheld in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.0.2), your application is affected.

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

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling'), where the product acts as an intermediary http agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed http requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination. In Meinheld, 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

meinheld prior to 1.0.2 is vulnerable to HTTP Request Smuggling. HTTP pipelining issues and request smuggling attacks might be possible due to incorrect Content-Length and Transfer encoding header parsing.

CVE-2020-7658 Affected Meinheld Versions

1 component(s)
Fixed Versions:
1.0.2
Product / Package Ecosystem Affected Versions Fixed Version
meinheld
pypi/meinheld
PyPI
< 1.0.2
1.0.2

References

NVD — CVE-2020-7658 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-7658
Meinheld Source Repository REPOSITORY
https://github.com/mopemope/meinheld/issues/111
Security Fix Commit FIX COMMIT
https://github.com/mopemope/meinheld/commit/0cfa70b2cd3800f1e4beeaef5421b156d90f0e09
Security Fix Commit FIX COMMIT
https://github.com/mopemope/meinheld/commit/3bc3e7ccd534277af955c0c92981d0aa033929a7
Security Fix Commit FIX COMMIT
https://github.com/mopemope/meinheld/commit/4155876bfd3e8fc4adad4aaa59ec3f1cefa1d2d1
Meinheld Source Repository REPOSITORY
https://github.com/mopemope/meinheld
Meinheld Source Repository REPOSITORY
https://github.com/mopemope/meinheld/blob/master/CHANGES.rst
Meinheld Source Repository REPOSITORY
https://github.com/pypa/advisory-database/tree/main/vulns/meinheld/PYSEC-2020-239.yaml
snyk.io/vuln/snyk-python-me... WEB
https://snyk.io/vuln/SNYK-PYTHON-MEINHELD-569140

Frequently Asked Questions

What is CVE-2020-7658?
CVE-2020-7658 is a security vulnerability in Meinheld involving meinheld vulnerable to HTTP Request Smuggling under CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling').
Which Meinheld versions are affected?
Affected versions include releases prior to 1.0.2 across affected packages: meinheld.
What version fixes CVE-2020-7658?
Upgrading to 1.0.2 (or the latest patched release for your respective branch) resolves the vulnerability.
Is meinheld affected?
Yes, meinheld is affected in releases prior to 1.0.2. Upgrade your dependency to 1.0.2 or later.
What is the CVSS score of CVE-2020-7658?
CVE-2020-7658 has a CVSS v3.1 base score of 6.1 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
What CWE is associated with CVE-2020-7658?
CVE-2020-7658 is classified under CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') (The product acts as an intermediary HTTP agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed HTTP requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination.).
How can I check PyPI dependencies for CVE-2020-7658?
Run the dependency tree command: 'pip show meinheld'. 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-63h2-9cc8-fc7m",
  "modified" : "2024-09-25T19:43:34Z",
  "published" : "2022-05-24T17:18:38Z",
  "aliases" : [ "CVE-2020-7658" ],
  "summary" : "meinheld vulnerable to HTTP Request Smuggling",
  "details" : "meinheld prior to 1.0.2 is vulnerable to HTTP Request Smuggling. HTTP pipelining issues and request smuggling attacks might be possible due to incorrect Content-Length and Transfer encoding header parsing.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "meinheld"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.0.2"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-7658"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/mopemope/meinheld/issues/111"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/mopemope/meinheld/commit/0cfa70b2cd3800f1e4beeaef5421b156d90f0e09"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/mopemope/meinheld/commit/3bc3e7ccd534277af955c0c92981d0aa033929a7"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/mopemope/meinheld/commit/4155876bfd3e8fc4adad4aaa59ec3f1cefa1d2d1"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/mopemope/meinheld"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/mopemope/meinheld/blob/master/CHANGES.rst"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pypa/advisory-database/tree/main/vulns/meinheld/PYSEC-2020-239.yaml"
  }, {
    "type" : "WEB",
    "url" : "https://snyk.io/vuln/SNYK-PYTHON-MEINHELD-569140"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-444" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2024-04-22T22:37:11Z",
    "nvd_published_at" : "2020-05-22T16:15:00Z"
  }
}