CVE-2021-4171: Calibreweb Calibre-web Is Vulnerable To Business Vulnerability

CRITICAL
Advisory Identifier: GHSA-xp7p-3gx7-j6wx
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CVSS 9.8
Published
Advisory Summary

CVE-2021-4171 is a CRITICAL (CVSS 9.8) calibre-web is vulnerable to business vulnerability (General Security Weakness) affecting Calibreweb libraries in the PyPI ecosystem. The issue involves calibre-web is vulnerable to business logic errors. Remediation is available by upgrading affected packages to version 0.6.15.

CVE-2021-4171 at a Glance

CVE Identifier CVE-2021-4171
GHSA Identifier GHSA-xp7p-3gx7-j6wx
Severity CRITICAL
CVSS v3.1 Base Score 9.8
CWE Classification General Security Weakness
Affected Product Calibreweb
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 9.8

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

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

How to Fix CVE-2021-4171

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

calibreweb fixed: 0.6.15 
pip install calibreweb>=0.6.15
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 calibreweb

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2021-4171, inspect your installed packages using pip:

pip show calibreweb

Analyze the terminal output to locate any version of Calibreweb in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.6.15), your application is affected.

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

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under General Security Weakness. In Calibreweb, 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

calibre-web is vulnerable to Business Logic Errors

CVE-2021-4171 Affected Calibreweb Versions

1 component(s)
Fixed Versions:
0.6.15
Product / Package Ecosystem Affected Versions Fixed Version
calibreweb
pypi/calibreweb
PyPI
< 0.6.15
0.6.15

References

NVD — CVE-2021-4171 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-4171
Security Fix Commit FIX COMMIT
https://github.com/janeczku/calibre-web/commit/3e0d8763c377d2146462811e3e4ccf13f0d312ce
Calibreweb Source Repository REPOSITORY
https://github.com/janeczku/calibre-web
huntr.dev/bounties/1117f439-1... WEB
https://huntr.dev/bounties/1117f439-133c-4563-afb2-6cd80607bd5c

Frequently Asked Questions

What is CVE-2021-4171?
CVE-2021-4171 is a security vulnerability in Calibreweb involving calibre-web is vulnerable to Business Logic Errors under General Security Weakness.
Which Calibreweb versions are affected?
Affected versions include releases prior to 0.6.15 across affected packages: calibreweb.
What version fixes CVE-2021-4171?
Upgrading to 0.6.15 (or the latest patched release for your respective branch) resolves the vulnerability.
Is calibreweb affected?
Yes, calibreweb is affected in releases prior to 0.6.15. Upgrade your dependency to 0.6.15 or later.
What is the CVSS score of CVE-2021-4171?
CVE-2021-4171 has a CVSS v3.1 base score of 9.8 (CRITICAL) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2021-4171?
CVE-2021-4171 is classified under General Security Weakness.
How can I check PyPI dependencies for CVE-2021-4171?
Run the dependency tree command: 'pip show calibreweb'. 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-xp7p-3gx7-j6wx",
  "modified" : "2022-01-25T19:12:24Z",
  "published" : "2022-01-21T23:44:15Z",
  "aliases" : [ "CVE-2021-4171" ],
  "summary" : "calibre-web is vulnerable to Business Logic Errors",
  "details" : "calibre-web is vulnerable to Business Logic Errors",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "calibreweb"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.6.15"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-4171"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/janeczku/calibre-web/commit/3e0d8763c377d2146462811e3e4ccf13f0d312ce"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/janeczku/calibre-web"
  }, {
    "type" : "WEB",
    "url" : "https://huntr.dev/bounties/1117f439-133c-4563-afb2-6cd80607bd5c"
  } ],
  "database_specific" : {
    "cwe_ids" : [ ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-01-19T15:03:22Z",
    "nvd_published_at" : "2022-01-17T10:15:00Z"
  }
}