CVE-2020-35678: Autobahn Open Redirect Vulnerability

MODERATE
Advisory Identifier: GHSA-gwp7-vqr5-h33h
Share
CVSS 6.1
CWE-601
Published
Advisory Summary

CVE-2020-35678 is a MODERATE (CVSS 6.1) open redirect vulnerability (CWE-601: URL Redirection to Untrusted Site ('Open Redirect')) affecting Autobahn libraries in the PyPI ecosystem. The issue involves open redirect in autobahn. Remediation is available by upgrading affected packages to version 20.12.3.

CVE-2020-35678 at a Glance

CVE Identifier CVE-2020-35678
GHSA Identifier GHSA-gwp7-vqr5-h33h
Severity MODERATE
CVSS v3.1 Base Score 6.1
CWE Classification CWE-601: URL Redirection to Untrusted Site ('Open Redirect')
Affected Product Autobahn
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-2020-35678

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

autobahn fixed: 20.12.3 
pip install autobahn>=20.12.3
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 autobahn

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2020-35678, inspect your installed packages using pip:

pip show autobahn

Analyze the terminal output to locate any version of Autobahn in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 20.12.3), your application is affected.

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

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-601: URL Redirection to Untrusted Site ('Open Redirect'), where the web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a redirect. In Autobahn, 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

Autobahn|Python before 20.12.3 allows redirect header injection.

CVE-2020-35678 Affected Autobahn Versions

1 component(s)
Fixed Versions:
20.12.3
Product / Package Ecosystem Affected Versions Fixed Version
autobahn
pypi/autobahn
PyPI
< 20.12.3
20.12.3

References

NVD — CVE-2020-35678 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-35678
Autobahn Source Repository REPOSITORY
https://github.com/crossbario/autobahn-python/pull/1439
Autobahn Security Information SECURITY
https://autobahn.readthedocs.io/en/latest/changelog.html
Autobahn Source Repository REPOSITORY
https://github.com/crossbario/autobahn-python
Autobahn Source Repository REPOSITORY
https://github.com/crossbario/autobahn-python/compare/v20.12.2...v20.12.3
Autobahn Source Repository REPOSITORY
https://github.com/pypa/advisory-database/tree/main/vulns/autobahn/PYSEC-2020-25.yaml
pypi.org/project/autobahn/20... WEB
https://pypi.org/project/autobahn/20.12.3

Frequently Asked Questions

What is CVE-2020-35678?
CVE-2020-35678 is a security vulnerability in Autobahn involving Open Redirect in autobahn under CWE-601: URL Redirection to Untrusted Site ('Open Redirect').
Which Autobahn versions are affected?
Affected versions include releases prior to 20.12.3 across affected packages: autobahn.
What version fixes CVE-2020-35678?
Upgrading to 20.12.3 (or the latest patched release for your respective branch) resolves the vulnerability.
Is autobahn affected?
Yes, autobahn is affected in releases prior to 20.12.3. Upgrade your dependency to 20.12.3 or later.
What is the CVSS score of CVE-2020-35678?
CVE-2020-35678 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-2020-35678?
CVE-2020-35678 is classified under CWE-601: URL Redirection to Untrusted Site ('Open Redirect') (The web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a redirect.).
How can I check PyPI dependencies for CVE-2020-35678?
Run the dependency tree command: 'pip show autobahn'. 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-gwp7-vqr5-h33h",
  "modified" : "2024-09-04T19:35:17Z",
  "published" : "2021-04-20T16:13:45Z",
  "aliases" : [ "CVE-2020-35678" ],
  "summary" : "Open Redirect in autobahn",
  "details" : "Autobahn|Python before 20.12.3 allows redirect header injection.",
  "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" : "autobahn"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "20.12.3"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-35678"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/crossbario/autobahn-python/pull/1439"
  }, {
    "type" : "WEB",
    "url" : "https://autobahn.readthedocs.io/en/latest/changelog.html"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/crossbario/autobahn-python"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/crossbario/autobahn-python/compare/v20.12.2...v20.12.3"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pypa/advisory-database/tree/main/vulns/autobahn/PYSEC-2020-25.yaml"
  }, {
    "type" : "WEB",
    "url" : "https://pypi.org/project/autobahn/20.12.3"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-601" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-04-07T22:27:56Z",
    "nvd_published_at" : "2020-12-27T00:15:00Z"
  }
}