CVE-2009-4762: Moin MoinMoin Improper Access Control Vulnerability Vulnerability

HIGH
Advisory Identifier: GHSA-jj23-fj2v-m872
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CVSS 7.5
CWE-284
Published
Advisory Summary

CVE-2009-4762 is a HIGH (CVSS 7.5) moinmoin improper access control vulnerability vulnerability (CWE-284: Improper Access Control) affecting Moin libraries in the PyPI ecosystem. The issue involves moinmoin improper access control vulnerability. Remediation is available by upgrading affected packages to version 1.7.3, 1.8.3.

CVE-2009-4762 at a Glance

CVE Identifier CVE-2009-4762
GHSA Identifier GHSA-jj23-fj2v-m872
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-284: Improper Access Control
Affected Product Moin
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 7.5

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:N/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 None (UI:N)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity High (I:H)
Availability None (A:N)

How to Fix CVE-2009-4762

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

moin fixed: 1.7.3 
pip install moin>=1.7.3
moin fixed: 1.8.3 
pip install moin>=1.8.3
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 moin

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2009-4762, inspect your installed packages using pip:

pip show moin

Analyze the terminal output to locate any version of Moin in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.7.3), your application is affected.

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

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-284: Improper Access Control, where the product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. In Moin, 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

MoinMoin 1.7.x before 1.7.3 and 1.8.x before 1.8.3 checks parent ACLs in certain inappropriate circumstances during processing of hierarchical ACLs, which allows remote attackers to bypass intended access restrictions by requesting an item, a different vulnerability than CVE-2008-6603.

CVE-2009-4762 Affected Moin Versions

2 component(s)
Fixed Versions:
1.7.31.8.3
Product / Package Ecosystem Affected Versions Fixed Version
moin
pypi/moin
PyPI
≥ 1.7.0
< 1.7.3
1.7.3
moin
pypi/moin
PyPI
≥ 1.8.0
< 1.8.3
1.8.3

References

NVD — CVE-2009-4762 NVD
https://nvd.nist.gov/vuln/detail/CVE-2009-4762
Moin Source Repository REPOSITORY
https://github.com/moinwiki/moin
Moin Source Repository REPOSITORY
https://github.com/pypa/advisory-database/tree/main/vulns/moin/PYSEC-2010-13.yaml
web.archive.org/web/20140805132556/... WEB
https://web.archive.org/web/20140805132556/http://secunia.com/advisories/39887
Moin Security Information SECURITY
https://web.archive.org/web/20200228153929/http://www.securityfocus.com/bid/35277
Moin Security Information SECURITY
http://hg.moinmo.in/moin/1.7/rev/897cdbe9e8f2
Moin Security Information SECURITY
http://hg.moinmo.in/moin/1.8/rev/897cdbe9e8f2
Moin Security Information SECURITY
http://moinmo.in/SecurityFixes
ubuntu.com/usn/usn-941-1 WEB
http://ubuntu.com/usn/usn-941-1
Moin Security Information SECURITY
http://www.debian.org/security/2010/dsa-2014

Frequently Asked Questions

What is CVE-2009-4762?
CVE-2009-4762 is a security vulnerability in Moin involving MoinMoin Improper Access Control vulnerability under CWE-284: Improper Access Control.
Which Moin versions are affected?
Affected versions include releases prior to 1.7.3, 1.8.3 across affected packages: moin.
What version fixes CVE-2009-4762?
Upgrading to 1.7.3, 1.8.3 (or the latest patched release for your respective branch) resolves the vulnerability.
Is moin affected?
Yes, moin is affected in releases prior to 1.7.3, 1.8.3. Upgrade your dependency to 1.7.3, 1.8.3 or later.
What is the CVSS score of CVE-2009-4762?
CVE-2009-4762 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.
What CWE is associated with CVE-2009-4762?
CVE-2009-4762 is classified under CWE-284: Improper Access Control (The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.).
How can I check PyPI dependencies for CVE-2009-4762?
Run the dependency tree command: 'pip show moin'. 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-jj23-fj2v-m872",
  "modified" : "2024-10-01T19:26:08Z",
  "published" : "2022-05-02T03:57:54Z",
  "aliases" : [ "CVE-2009-4762" ],
  "summary" : "MoinMoin Improper Access Control vulnerability",
  "details" : "MoinMoin 1.7.x before 1.7.3 and 1.8.x before 1.8.3 checks parent ACLs in certain inappropriate circumstances during processing of hierarchical ACLs, which allows remote attackers to bypass intended access restrictions by requesting an item, a different vulnerability than CVE-2008-6603.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "moin"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "1.7.0"
      }, {
        "fixed" : "1.7.3"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "moin"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "1.8.0"
      }, {
        "fixed" : "1.8.3"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2009-4762"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/moinwiki/moin"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pypa/advisory-database/tree/main/vulns/moin/PYSEC-2010-13.yaml"
  }, {
    "type" : "WEB",
    "url" : "https://web.archive.org/web/20140805132556/http://secunia.com/advisories/39887"
  }, {
    "type" : "WEB",
    "url" : "https://web.archive.org/web/20200228153929/http://www.securityfocus.com/bid/35277"
  }, {
    "type" : "WEB",
    "url" : "http://hg.moinmo.in/moin/1.7/rev/897cdbe9e8f2"
  }, {
    "type" : "WEB",
    "url" : "http://hg.moinmo.in/moin/1.8/rev/897cdbe9e8f2"
  }, {
    "type" : "WEB",
    "url" : "http://moinmo.in/SecurityFixes"
  }, {
    "type" : "WEB",
    "url" : "http://ubuntu.com/usn/usn-941-1"
  }, {
    "type" : "WEB",
    "url" : "http://www.debian.org/security/2010/dsa-2014"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-284" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2024-04-29T14:41:13Z",
    "nvd_published_at" : "2010-03-29T20:30:00Z"
  }
}