CVE-2022-0637: Pollbot Open Redirect Vulnerability

MODERATE
Advisory Identifier: GHSA-vg27-hr3v-3cqv
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CVSS 6.1
CWE-601
Published
Advisory Summary

CVE-2022-0637 is a MODERATE (CVSS 6.1) open redirect vulnerability (CWE-601: URL Redirection to Untrusted Site ('Open Redirect')) affecting Pollbot libraries in the PyPI ecosystem. The issue involves open redirect in pollbot. Remediation is available by upgrading affected packages to version 1.4.6.

CVE-2022-0637 at a Glance

CVE Identifier CVE-2022-0637
GHSA Identifier GHSA-vg27-hr3v-3cqv
Severity MODERATE
CVSS v3.1 Base Score 6.1
CWE Classification CWE-601: URL Redirection to Untrusted Site ('Open Redirect')
Affected Product Pollbot
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-2022-0637

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

pollbot fixed: 1.4.6 
pip install pollbot>=1.4.6
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 pollbot

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2022-0637, inspect your installed packages using pip:

pip show pollbot

Analyze the terminal output to locate any version of Pollbot in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.4.6), your application is affected.

Note: The pip show pollbot 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 Pollbot, 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

(From https://bugzilla.mozilla.org/show_bug.cgi?id=1753838) Summary: There was an open redirection vulnerability in the path of: https://pollbot.services.mozilla.com/ and https://pollbot.stage.mozaws.net/ Description: An attacker can redirect anyone to malicious sites. Steps To Reproduce: Type in this URL: https://pollbot.services.mozilla.com/%0a/evil.com/ It redirects to that website evil.com evil.com was used as an example but this could be any website. Note, the /%0a/ and trailing / are required. Supporting Material/References: https://cheatsheetseries.owasp.org/cheatsheets/Unvalidated_Redirects_and_Forwards_Cheat_Sheet.html Impact Attackers can serve malicious websites that steal passwords or download ransomware to their victims machine due to a redirect and there are a heap of other attack vectors.

CVE-2022-0637 Affected Pollbot Versions

1 component(s)
Fixed Versions:
1.4.6
Product / Package Ecosystem Affected Versions Fixed Version
pollbot
pypi/pollbot
PyPI
< 1.4.6
1.4.6

References

GitHub Advisory / Wiki ADVISORY
https://github.com/mozilla/PollBot/security/advisories/GHSA-vg27-hr3v-3cqv
NVD — CVE-2022-0637 NVD
https://nvd.nist.gov/vuln/detail/CVE-2022-0637
Pollbot Source Repository REPOSITORY
https://github.com/mozilla/PollBot/pull/360
Security Fix Commit FIX COMMIT
https://github.com/mozilla/PollBot/commit/e39d8bec2df582ba525bb2e2f33c3ebc584d7ff8
bugzilla.mozilla.org/show_bug.cgi WEB
https://bugzilla.mozilla.org/show_bug.cgi?id=1753838
bugzilla.mozilla.org/show_bug.cgi WEB
https://bugzilla.mozilla.org/show_bug.cgi?id=CVE-2022-0637
Pollbot Source Repository REPOSITORY
https://github.com/mozilla/PollBot

Frequently Asked Questions

What is CVE-2022-0637?
CVE-2022-0637 is a security vulnerability in Pollbot involving open redirect in pollbot under CWE-601: URL Redirection to Untrusted Site ('Open Redirect').
Which Pollbot versions are affected?
Affected versions include releases prior to 1.4.6 across affected packages: pollbot.
What version fixes CVE-2022-0637?
Upgrading to 1.4.6 (or the latest patched release for your respective branch) resolves the vulnerability.
Is pollbot affected?
Yes, pollbot is affected in releases prior to 1.4.6. Upgrade your dependency to 1.4.6 or later.
What is the CVSS score of CVE-2022-0637?
CVE-2022-0637 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-2022-0637?
CVE-2022-0637 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-2022-0637?
Run the dependency tree command: 'pip show pollbot'. 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-vg27-hr3v-3cqv",
  "modified" : "2023-02-28T16:49:36Z",
  "published" : "2022-02-16T23:02:09Z",
  "aliases" : [ "CVE-2022-0637" ],
  "summary" : "open redirect in pollbot",
  "details" : "(From https://bugzilla.mozilla.org/show_bug.cgi?id=1753838)\n\nSummary:\nThere was an open redirection vulnerability in the path of:\n\nhttps://pollbot.services.mozilla.com/ and https://pollbot.stage.mozaws.net/\n\nDescription:\nAn attacker can redirect anyone to malicious sites.\n\nSteps To Reproduce:\nType in this URL:\n\nhttps://pollbot.services.mozilla.com/%0a/evil.com/\n\nIt redirects to that website\n\nevil.com\n\nevil.com was used as an example but this could be any website. Note, the /%0a/ and trailing / are required.\n\nSupporting Material/References:\nhttps://cheatsheetseries.owasp.org/cheatsheets/Unvalidated_Redirects_and_Forwards_Cheat_Sheet.html\n\nImpact\n\nAttackers can serve malicious websites that steal passwords or download ransomware to their victims machine due to a redirect and there are a heap of other attack vectors.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "pollbot"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.4.6"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/mozilla/PollBot/security/advisories/GHSA-vg27-hr3v-3cqv"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2022-0637"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/mozilla/PollBot/pull/360"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/mozilla/PollBot/commit/e39d8bec2df582ba525bb2e2f33c3ebc584d7ff8"
  }, {
    "type" : "WEB",
    "url" : "https://bugzilla.mozilla.org/show_bug.cgi?id=1753838"
  }, {
    "type" : "WEB",
    "url" : "https://bugzilla.mozilla.org/show_bug.cgi?id=CVE-2022-0637"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/mozilla/PollBot"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-601" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-02-16T23:02:09Z",
    "nvd_published_at" : "2023-02-16T22:15:00Z"
  }
}