CVE-2016-2155: Moodle/moodle Moodle Allows Attackers To Modify Vulnerability

MODERATE
Advisory Identifier: GHSA-32hg-73hp-vwc8
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CVSS 4.3
Published
Advisory Summary

CVE-2016-2155 is a MODERATE (CVSS 4.3) moodle allows attackers to modify vulnerability (General Security Weakness) affecting Moodle/moodle libraries in the Packagist ecosystem. The issue involves moodle allows attackers to modify "exclude grade" settings. Remediation is available by upgrading affected packages to version 2.8.11, 2.9.5, 3.0.3.

CVE-2016-2155 at a Glance

CVE Identifier CVE-2016-2155
GHSA Identifier GHSA-32hg-73hp-vwc8
Severity MODERATE
CVSS v3.1 Base Score 4.3
CWE Classification General Security Weakness
Affected Product Moodle/moodle
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 4.3

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:N/I:L/A:N).

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 None (C:N)
Integrity Low (I:L)
Availability None (A:N)

How to Fix CVE-2016-2155

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: 2.8.11 
Upgrade moodle/moodle to 2.8.11
moodle/moodle fixed: 2.9.5 
Upgrade moodle/moodle to 2.9.5
moodle/moodle fixed: 3.0.3 
Upgrade moodle/moodle to 3.0.3
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-2016-2155, 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 2.8.11), 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 General Security Weakness. 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

The grade-reporting feature in Singleview (aka Single View) in Moodle 2.8.x before 2.8.11, 2.9.x before 2.9.5, and 3.0.x before 3.0.3 does not consider the moodle/grade:manage capability, which allows remote authenticated users to modify "Exclude grade" settings by leveraging the Non-Editing Instructor role.

CVE-2016-2155 Affected Moodle/moodle Versions

3 component(s)
Fixed Versions:
2.8.112.9.53.0.3
Product / Package Ecosystem Affected Versions Fixed Version
moodle/moodle
 Packagist
≥ 2.8.0
< 2.8.11
2.8.11
moodle/moodle
 Packagist
≥ 2.9.0
< 2.9.5
2.9.5
moodle/moodle
 Packagist
≥ 3.0.0
< 3.0.3
3.0.3

References

NVD — CVE-2016-2155 NVD
https://nvd.nist.gov/vuln/detail/CVE-2016-2155
Security Fix Commit FIX COMMIT
https://github.com/moodle/moodle/commit/3328dc32a75d6aa4bc92865fa236dc6d52dcb7bf
Security Fix Commit FIX COMMIT
https://github.com/moodle/moodle/commit/5208032b23b7999d7048a3da7a4b70c038d93506
Security Fix Commit FIX COMMIT
https://github.com/moodle/moodle/commit/71beedee8c82c378ed10a0569c8b19ec641df9e3
Security Fix Commit FIX COMMIT
https://github.com/moodle/moodle/commit/ad67b7eeea4abf194eb432d5958e9a7032ee2c25
Security Fix Commit FIX COMMIT
https://github.com/moodle/moodle/commit/ae66ed23b6ae8000efd4e1f612697892c9795c65
Security Fix Commit FIX COMMIT
https://github.com/moodle/moodle/commit/b74d0f8404651d9ad0d97fd7eb58a94079342eb3
Security Fix Commit FIX COMMIT
https://github.com/moodle/moodle/commit/c7f7b18adecb4a80c4f3defee31e72e591133693
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=330177
Moodle/moodle Security Information SECURITY
https://web.archive.org/web/20160424224349/http://www.securitytracker.com/id/1035333
git.moodle.org/gw WEB
http://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL-52378
Moodle/moodle Security Information SECURITY
http://www.openwall.com/lists/oss-security/2016/03/21/1

Frequently Asked Questions

What is CVE-2016-2155?
CVE-2016-2155 is a security vulnerability in Moodle/moodle involving Moodle allows attackers to modify "Exclude grade" settings under General Security Weakness.
Which Moodle/moodle versions are affected?
Affected versions include releases prior to 2.8.11, 2.9.5, 3.0.3 across affected packages: moodle/moodle.
What version fixes CVE-2016-2155?
Upgrading to 2.8.11, 2.9.5, 3.0.3 (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 2.8.11, 2.9.5, 3.0.3. Upgrade your dependency to 2.8.11, 2.9.5, 3.0.3 or later.
What is the CVSS score of CVE-2016-2155?
CVE-2016-2155 has a CVSS v3.1 base score of 4.3 (MODERATE) with vector string CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N.
What CWE is associated with CVE-2016-2155?
CVE-2016-2155 is classified under General Security Weakness.
How can I check Packagist dependencies for CVE-2016-2155?
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-32hg-73hp-vwc8",
  "modified" : "2024-01-26T20:14:34Z",
  "published" : "2022-05-13T01:12:38Z",
  "aliases" : [ "CVE-2016-2155" ],
  "summary" : "Moodle allows attackers to modify \"Exclude grade\" settings",
  "details" : "The grade-reporting feature in Singleview (aka Single View) in Moodle 2.8.x before 2.8.11, 2.9.x before 2.9.5, and 3.0.x before 3.0.3 does not consider the moodle/grade:manage capability, which allows remote authenticated users to modify \"Exclude grade\" settings by leveraging the Non-Editing Instructor role.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N"
  } ],
  "affected" : [ {
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      "name" : "moodle/moodle"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "2.8.0"
      }, {
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      } ]
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  }, {
    "package" : {
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      "type" : "ECOSYSTEM",
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      }, {
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      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2016-2155"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/moodle/moodle/commit/3328dc32a75d6aa4bc92865fa236dc6d52dcb7bf"
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    "type" : "WEB",
    "url" : "https://github.com/moodle/moodle/commit/5208032b23b7999d7048a3da7a4b70c038d93506"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/moodle/moodle/commit/71beedee8c82c378ed10a0569c8b19ec641df9e3"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/moodle/moodle/commit/ad67b7eeea4abf194eb432d5958e9a7032ee2c25"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/moodle/moodle/commit/ae66ed23b6ae8000efd4e1f612697892c9795c65"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/moodle/moodle/commit/b74d0f8404651d9ad0d97fd7eb58a94079342eb3"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/moodle/moodle/commit/c7f7b18adecb4a80c4f3defee31e72e591133693"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/moodle/moodle"
  }, {
    "type" : "WEB",
    "url" : "https://moodle.org/mod/forum/discuss.php?d=330177"
  }, {
    "type" : "WEB",
    "url" : "https://web.archive.org/web/20160424224349/http://www.securitytracker.com/id/1035333"
  }, {
    "type" : "WEB",
    "url" : "http://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL-52378"
  }, {
    "type" : "WEB",
    "url" : "http://www.openwall.com/lists/oss-security/2016/03/21/1"
  } ],
  "database_specific" : {
    "cwe_ids" : [ ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2024-01-26T20:14:34Z",
    "nvd_published_at" : "2016-05-22T20:59:00Z"
  }
}