CVE-2020-7936: Plone Plone Open Redirect Vulnerability Vulnerability

MODERATE
Advisory Identifier: GHSA-82j9-wfcf-9v2h
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CVSS 6.1
CWE-601
Published
Advisory Summary

CVE-2020-7936 is a MODERATE (CVSS 6.1) plone open redirect vulnerability vulnerability (CWE-601: URL Redirection to Untrusted Site ('Open Redirect')) affecting Plone libraries in the PyPI ecosystem. The issue involves plone open redirect vulnerability. Remediation is available by upgrading affected packages to version 4.3.20, 5.1.7, 5.2.2.

CVE-2020-7936 at a Glance

CVE Identifier CVE-2020-7936
GHSA Identifier GHSA-82j9-wfcf-9v2h
Severity MODERATE
CVSS v3.1 Base Score 6.1
CWE Classification CWE-601: URL Redirection to Untrusted Site ('Open Redirect')
Affected Product Plone
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-2020-7936

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

Plone fixed: 4.3.20 
pip install Plone>=4.3.20
Plone fixed: 5.1.7 
pip install Plone>=5.1.7
Plone fixed: 5.2.2 
pip install Plone>=5.2.2
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 Plone

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2020-7936, inspect your installed packages using pip:

pip show Plone

Analyze the terminal output to locate any version of Plone in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 4.3.20), your application is affected.

Note: The pip show Plone 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 Plone, 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

An open redirect on the login form (and possibly other places) in Plone 4.0 through 5.2.1 allows an attacker to craft a link to a Plone Site that, when followed, and possibly after login, will redirect to an attacker's site.

CVE-2020-7936 Affected Plone Versions

3 component(s)
Fixed Versions:
4.3.205.1.75.2.2
Product / Package Ecosystem Affected Versions Fixed Version
Plone
pypi/Plone
PyPI
≥ 4.0
< 4.3.20
4.3.20
Plone
pypi/Plone
PyPI
≥ 5.0rc1
< 5.1.7
5.1.7
Plone
pypi/Plone
PyPI
≥ 5.2.0
< 5.2.2
5.2.2

References

NVD — CVE-2020-7936 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-7936
Plone Source Repository REPOSITORY
https://github.com/plone/Plone
Plone Source Repository REPOSITORY
https://github.com/pypa/advisory-database/tree/main/vulns/plone/PYSEC-2020-85.yaml
Plone Security Information SECURITY
https://plone.org/security/hotfix/20200121
Plone Security Information SECURITY
https://plone.org/security/hotfix/20200121/an-open-redirection-on-the-login-form-and-possibly-other-places
Plone Security Information SECURITY
https://www.openwall.com/lists/oss-security/2020/01/22/1
Plone Security Information SECURITY
http://www.openwall.com/lists/oss-security/2020/01/24/1

Frequently Asked Questions

What is CVE-2020-7936?
CVE-2020-7936 is a security vulnerability in Plone involving Plone Open Redirect Vulnerability under CWE-601: URL Redirection to Untrusted Site ('Open Redirect').
Which Plone versions are affected?
Affected versions include releases prior to 4.3.20, 5.1.7, 5.2.2 across affected packages: Plone.
What version fixes CVE-2020-7936?
Upgrading to 4.3.20, 5.1.7, 5.2.2 (or the latest patched release for your respective branch) resolves the vulnerability.
Is Plone affected?
Yes, Plone is affected in releases prior to 4.3.20, 5.1.7, 5.2.2. Upgrade your dependency to 4.3.20, 5.1.7, 5.2.2 or later.
What is the CVSS score of CVE-2020-7936?
CVE-2020-7936 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-2020-7936?
CVE-2020-7936 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-2020-7936?
Run the dependency tree command: 'pip show Plone'. 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-82j9-wfcf-9v2h",
  "modified" : "2024-10-18T21:45:41Z",
  "published" : "2022-05-24T17:07:14Z",
  "aliases" : [ "CVE-2020-7936" ],
  "summary" : "Plone Open Redirect Vulnerability",
  "details" : "An open redirect on the login form (and possibly other places) in Plone 4.0 through 5.2.1 allows an attacker to craft a link to a Plone Site that, when followed, and possibly after login, will redirect to an attacker's site.",
  "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" : "Plone"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "4.0"
      }, {
        "fixed" : "4.3.20"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "Plone"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "5.0rc1"
      }, {
        "fixed" : "5.1.7"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "Plone"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "5.2.0"
      }, {
        "fixed" : "5.2.2"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-7936"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/plone/Plone"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pypa/advisory-database/tree/main/vulns/plone/PYSEC-2020-85.yaml"
  }, {
    "type" : "WEB",
    "url" : "https://plone.org/security/hotfix/20200121"
  }, {
    "type" : "WEB",
    "url" : "https://plone.org/security/hotfix/20200121/an-open-redirection-on-the-login-form-and-possibly-other-places"
  }, {
    "type" : "WEB",
    "url" : "https://www.openwall.com/lists/oss-security/2020/01/22/1"
  }, {
    "type" : "WEB",
    "url" : "http://www.openwall.com/lists/oss-security/2020/01/24/1"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-601" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2023-07-12T23:52:07Z",
    "nvd_published_at" : "2020-01-23T21:15:00Z"
  }
}