CVE-2018-1133: Moodle/moodle Remote Code Execution Vulnerability

HIGH
Advisory Identifier: GHSA-xh2j-q4mc-v522
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CVSS 8.8
CWE-94
Published
Advisory Summary

CVE-2018-1133 is a HIGH (CVSS 8.8) remote code execution vulnerability (CWE-94: Improper Control of Generation of Code ('Code Injection')) affecting Moodle/moodle libraries in the Packagist ecosystem. The issue involves moodle calculated question type allows remote code execution by question authors. Remediation is available by upgrading affected packages to version 3.1.12, 3.2.9, 3.3.6, 3.4.3.

CVE-2018-1133 at a Glance

CVE Identifier CVE-2018-1133
GHSA Identifier GHSA-xh2j-q4mc-v522
Severity HIGH
CVSS v3.1 Base Score 8.8
CWE Classification CWE-94: Improper Control of Generation of Code ('Code Injection')
Affected Product Moodle/moodle
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 8.8

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required Low (PR:L)
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-2018-1133

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

moodle/moodle fixed: 3.1.12 
Upgrade moodle/moodle to 3.1.12
moodle/moodle fixed: 3.2.9 
Upgrade moodle/moodle to 3.2.9
moodle/moodle fixed: 3.3.6 
Upgrade moodle/moodle to 3.3.6
moodle/moodle fixed: 3.4.3 
Upgrade moodle/moodle to 3.4.3
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for moodle/moodle

How to Check if You Are Affected

To determine whether your application is affected by CVE-2018-1133, inspect your project dependencies for Moodle/moodle:

inspect dependencies for moodle/moodle

Analyze the terminal output to locate any version of Moodle/moodle in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 3.1.12), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-94: Improper Control of Generation of Code ('Code Injection'), where the product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment. In Moodle/moodle, 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 issue was discovered in Moodle 3.x. A Teacher creating a Calculated question can intentionally cause remote code execution on the server, aka eval injection.

CVE-2018-1133 Affected Moodle/moodle Versions

4 component(s)
Fixed Versions:
3.1.123.2.93.3.63.4.3
Product / Package Ecosystem Affected Versions Fixed Version
moodle/moodle
 Packagist
≥ 3.1
< 3.1.12
3.1.12
moodle/moodle
 Packagist
≥ 3.2
< 3.2.9
3.2.9
moodle/moodle
 Packagist
≥ 3.3
< 3.3.6
3.3.6
moodle/moodle
 Packagist
≥ 3.4
< 3.4.3
3.4.3

References

NVD — CVE-2018-1133 NVD
https://nvd.nist.gov/vuln/detail/CVE-2018-1133
Moodle/moodle Source Repository REPOSITORY
https://github.com/moodle/moodle
moodle.org/mod/forum/discuss.p... WEB
https://moodle.org/mod/forum/discuss.php?d=371199
www.exploit-db.com/exploits/46551 WEB
https://www.exploit-db.com/exploits/46551
Moodle/moodle Security Information SECURITY
http://www.securityfocus.com/bid/104307

Frequently Asked Questions

What is CVE-2018-1133?
CVE-2018-1133 is a security vulnerability in Moodle/moodle involving Moodle calculated question type allows remote code execution by Question authors under CWE-94: Improper Control of Generation of Code ('Code Injection').
Which Moodle/moodle versions are affected?
Affected versions include releases prior to 3.1.12, 3.2.9, 3.3.6, 3.4.3 across affected packages: moodle/moodle.
What version fixes CVE-2018-1133?
Upgrading to 3.1.12, 3.2.9, 3.3.6, 3.4.3 (or the latest patched release for your respective branch) resolves the vulnerability.
Is moodle/moodle affected?
Yes, moodle/moodle is affected in releases prior to 3.1.12, 3.2.9, 3.3.6, 3.4.3. Upgrade your dependency to 3.1.12, 3.2.9, 3.3.6, 3.4.3 or later.
What is the CVSS score of CVE-2018-1133?
CVE-2018-1133 has a CVSS v3.1 base score of 8.8 (HIGH) with vector string CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2018-1133?
CVE-2018-1133 is classified under CWE-94: Improper Control of Generation of Code ('Code Injection') (The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.).
How can I check Packagist dependencies for CVE-2018-1133?
Run the dependency tree command: 'inspect dependencies for moodle/moodle'. 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-xh2j-q4mc-v522",
  "modified" : "2024-04-23T23:41:29Z",
  "published" : "2022-05-13T01:18:54Z",
  "aliases" : [ "CVE-2018-1133" ],
  "summary" : "Moodle calculated question type allows remote code execution by Question authors",
  "details" : "An issue was discovered in Moodle 3.x. A Teacher creating a Calculated question can intentionally cause remote code execution on the server, aka eval injection.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
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    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
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        "introduced" : "3.1"
      }, {
        "fixed" : "3.1.12"
      } ]
    } ]
  }, {
    "package" : {
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    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
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      }, {
        "fixed" : "3.2.9"
      } ]
    } ]
  }, {
    "package" : {
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    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "3.3"
      }, {
        "fixed" : "3.3.6"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "moodle/moodle"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "3.4"
      }, {
        "fixed" : "3.4.3"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2018-1133"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/moodle/moodle"
  }, {
    "type" : "WEB",
    "url" : "https://moodle.org/mod/forum/discuss.php?d=371199"
  }, {
    "type" : "WEB",
    "url" : "https://www.exploit-db.com/exploits/46551"
  }, {
    "type" : "WEB",
    "url" : "http://www.securityfocus.com/bid/104307"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-94" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2024-04-23T23:41:29Z",
    "nvd_published_at" : "2018-05-25T12:29:00Z"
  }
}