CVE-2021-32806: Products.isurlinportal URL Redirection To Untrusted Site Vulnerability

HIGH
Advisory Identifier: GHSA-q3m9-9fj2-mfwr
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CVSS 6.5
CWE-601
Published
Advisory Summary

CVE-2021-32806 is a HIGH (CVSS 6.5) url redirection to untrusted site vulnerability (CWE-601: URL Redirection to Untrusted Site ('Open Redirect')) affecting Products.isurlinportal libraries in the PyPI ecosystem. The issue involves url redirection to untrusted site ('open redirect') in products.isurlinportal. Remediation is available by upgrading affected packages to version 1.2.0.

CVE-2021-32806 at a Glance

CVE Identifier CVE-2021-32806
GHSA Identifier GHSA-q3m9-9fj2-mfwr
Severity HIGH
CVSS v3.1 Base Score 6.5
CWE Classification CWE-601: URL Redirection to Untrusted Site ('Open Redirect')
Affected Product Products.isurlinportal
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 6.5

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:U/C:N/I:H/A:N).

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

How to Fix CVE-2021-32806

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

Products.isurlinportal fixed: 1.2.0 
pip install Products.isurlinportal>=1.2.0
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 Products.isurlinportal

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2021-32806, inspect your installed packages using pip:

pip show Products.isurlinportal

Analyze the terminal output to locate any version of Products.isurlinportal in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.2.0), your application is affected.

Note: The pip show Products.isurlinportal 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 Products.isurlinportal, 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

### Impact Various parts of Plone use the 'is url in portal' check for security, mostly to see if it is safe to redirect to a url. A url like `https://example.org` is not in the portal. But the url `https:example.org` without slashes tricks our code and it _is_ considered to be in the portal. When redirecting, some browsers go to `https://example.org`, others give an error. Attackers may use this to redirect you to their site, especially as part of a phishing attack. ### Patches The problem has been patched in `Products.isurlinportal` 1.2.0. This is a recommended upgrade for all users of Plone 4.3 and 5, on Python 2.7 or higher. It has not been tested on earlier Plone or Python versions. Upcoming Plone 5.2.5 and higher will include the new version. ### Discovered This vulnerability was discovered and reported by Yuji Tounai of Mitsui Bussan Secure Directions, Inc. Thank you! ### For more information If you have any questions or comments about this advisory: * Email the Plone Security Team at [security@plone.org](mailto:security@plone.org), especially when you think you have discovered a security problem or when you are not sure. * Open an issue in [the tracker](https://github.com/plone/Products.isurlinportal/issues) if your question or comment can be public.

CVE-2021-32806 Affected Products.isurlinportal Versions

1 component(s)
Fixed Versions:
1.2.0
Product / Package Ecosystem Affected Versions Fixed Version
Products.isurlinportal
pypi/Products.isurlinportal
PyPI
< 1.2.0
1.2.0

References

GitHub Advisory / Wiki ADVISORY
https://github.com/plone/Products.isurlinportal/security/advisories/GHSA-q3m9-9fj2-mfwr
NVD — CVE-2021-32806 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-32806
Security Fix Commit FIX COMMIT
https://github.com/plone/Products.isurlinportal/commit/d4fd34990d18adf05a10dc5e2bb4b066798280ba
Products.isurlinportal Source Repository REPOSITORY
https://github.com/plone/Products.isurlinportal
Products.isurlinportal Source Repository REPOSITORY
https://github.com/pypa/advisory-database/tree/main/vulns/products-isurlinportal/PYSEC-2021-323.yaml
jvn.jp/en/jp/jvn50804280/i... WEB
http://jvn.jp/en/jp/JVN50804280/index.html

Frequently Asked Questions

What is CVE-2021-32806?
CVE-2021-32806 is a security vulnerability in Products.isurlinportal involving URL Redirection to Untrusted Site ('Open Redirect') in Products.isurlinportal under CWE-601: URL Redirection to Untrusted Site ('Open Redirect').
Which Products.isurlinportal versions are affected?
Affected versions include releases prior to 1.2.0 across affected packages: Products.isurlinportal.
What version fixes CVE-2021-32806?
Upgrading to 1.2.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is Products.isurlinportal affected?
Yes, Products.isurlinportal is affected in releases prior to 1.2.0. Upgrade your dependency to 1.2.0 or later.
What is the CVSS score of CVE-2021-32806?
CVE-2021-32806 has a CVSS v3.1 base score of 6.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N.
What CWE is associated with CVE-2021-32806?
CVE-2021-32806 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-2021-32806?
Run the dependency tree command: 'pip show Products.isurlinportal'. 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-q3m9-9fj2-mfwr",
  "modified" : "2024-10-21T20:06:22Z",
  "published" : "2021-08-05T17:02:12Z",
  "aliases" : [ "CVE-2021-32806" ],
  "summary" : "URL Redirection to Untrusted Site ('Open Redirect') in Products.isurlinportal",
  "details" : "### Impact\nVarious parts of Plone use the 'is url in portal' check for security, mostly to see if it is safe to redirect to a url. A url like `https://example.org` is not in the portal.\nBut the url `https:example.org` without slashes tricks our code and it _is_ considered to be in the portal.\nWhen redirecting, some browsers go to `https://example.org`, others give an error.\nAttackers may use this to redirect you to their site, especially as part of a phishing attack.\n\n### Patches\nThe problem has been patched in `Products.isurlinportal` 1.2.0.\nThis is a recommended upgrade for all users of Plone 4.3 and 5, on Python 2.7 or higher.\nIt has not been tested on earlier Plone or Python versions.\nUpcoming Plone 5.2.5 and higher will include the new version.\n\n### Discovered\nThis vulnerability was discovered and reported by Yuji Tounai of Mitsui Bussan Secure Directions, Inc. Thank you!\n\n### For more information\nIf you have any questions or comments about this advisory:\n* Email the Plone Security Team at [security@plone.org](mailto:security@plone.org), especially when you think you have discovered a security problem or when you are not sure.\n* Open an issue in [the tracker](https://github.com/plone/Products.isurlinportal/issues) if your question or comment can be public.\n",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "Products.isurlinportal"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.2.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/plone/Products.isurlinportal/security/advisories/GHSA-q3m9-9fj2-mfwr"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-32806"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/plone/Products.isurlinportal/commit/d4fd34990d18adf05a10dc5e2bb4b066798280ba"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/plone/Products.isurlinportal"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pypa/advisory-database/tree/main/vulns/products-isurlinportal/PYSEC-2021-323.yaml"
  }, {
    "type" : "WEB",
    "url" : "http://jvn.jp/en/jp/JVN50804280/index.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-601" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-08-02T23:19:30Z",
    "nvd_published_at" : "2021-08-02T19:15:00Z"
  }
}