CVE-2021-3818: Getgrav/grav Reliance On Cookies Without Validation Vulnerability

MODERATE
Advisory Identifier: GHSA-cg3q-59w7-rvc2
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CVSS 6.3
CWE-565
Published
Advisory Summary

CVE-2021-3818 is a MODERATE (CVSS 6.3) reliance on cookies without validation vulnerability (CWE-565: Reliance on Cookies without Validation and Integrity Checking) affecting Getgrav/grav libraries in the Packagist ecosystem. The issue involves reliance on cookies without validation and integrity checking in getgrav/grav. Remediation is available by upgrading affected packages to version 1.7.21.

CVE-2021-3818 at a Glance

CVE Identifier CVE-2021-3818
GHSA Identifier GHSA-cg3q-59w7-rvc2
Severity MODERATE
CVSS v3.1 Base Score 6.3
CWE Classification CWE-565: Reliance on Cookies without Validation and Integrity Checking
Affected Product Getgrav/grav
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 6.3

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

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 Low (C:L)
Integrity Low (I:L)
Availability Low (A:L)

How to Fix CVE-2021-3818

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

getgrav/grav fixed: 1.7.21 
Upgrade getgrav/grav to 1.7.21
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 getgrav/grav

How to Check if You Are Affected

To determine whether your application is affected by CVE-2021-3818, inspect your project dependencies for Getgrav/grav:

inspect dependencies for getgrav/grav

Analyze the terminal output to locate any version of Getgrav/grav in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.7.21), 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-565: Reliance on Cookies without Validation and Integrity Checking, where the product relies on the existence or values of cookies when performing security-critical operations, but it does not properly ensure that the setting is valid for the associated user. In Getgrav/grav, 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

grav is vulnerable to Reliance on Cookies without Validation and Integrity Checking. A cookie with an overly broad path can be accessed through other applications on the same domain. Since cookies often carry sensitive information such as session identifiers, sharing cookies across applications can lead a vulnerability in one application to cause a compromise in another.

CVE-2021-3818 Affected Getgrav/grav Versions

1 component(s)
Fixed Versions:
1.7.21
Product / Package Ecosystem Affected Versions Fixed Version
getgrav/grav
 Packagist
< 1.7.21
1.7.21

References

Security Fix Commit FIX COMMIT
https://github.com/getgrav/grav/commit/c51fb1779b83f620c0b6f3548d4a96322b55df07
Getgrav/grav Source Repository REPOSITORY
https://github.com/getgrav/grav
huntr.dev/bounties/c2bc65af-7... WEB
https://huntr.dev/bounties/c2bc65af-7b93-4020-886e-8cdaeb0a58ea

Frequently Asked Questions

What is CVE-2021-3818?
CVE-2021-3818 is a security vulnerability in Getgrav/grav involving Reliance on Cookies without Validation and Integrity Checking in getgrav/grav under CWE-565: Reliance on Cookies without Validation and Integrity Checking.
Which Getgrav/grav versions are affected?
Affected versions include releases prior to 1.7.21 across affected packages: getgrav/grav.
What version fixes CVE-2021-3818?
Upgrading to 1.7.21 (or the latest patched release for your respective branch) resolves the vulnerability.
Is getgrav/grav affected?
Yes, getgrav/grav is affected in releases prior to 1.7.21. Upgrade your dependency to 1.7.21 or later.
What is the CVSS score of CVE-2021-3818?
CVE-2021-3818 has a CVSS v3.1 base score of 6.3 (MODERATE) with vector string CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L.
What CWE is associated with CVE-2021-3818?
CVE-2021-3818 is classified under CWE-565: Reliance on Cookies without Validation and Integrity Checking (The product relies on the existence or values of cookies when performing security-critical operations, but it does not properly ensure that the setting is valid for the associated user.).
How can I check Packagist dependencies for CVE-2021-3818?
Run the dependency tree command: 'inspect dependencies for getgrav/grav'. 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-cg3q-59w7-rvc2",
  "modified" : "2021-09-28T20:32:37Z",
  "published" : "2021-09-29T17:12:51Z",
  "aliases" : [ "CVE-2021-3818" ],
  "summary" : "Reliance on Cookies without Validation and Integrity Checking in getgrav/grav",
  "details" : "grav is vulnerable to Reliance on Cookies without Validation and Integrity Checking. A cookie with an overly broad path can be accessed through other applications on the same domain. Since cookies often carry sensitive information such as session identifiers, sharing cookies across applications can lead a vulnerability in one application to cause a compromise in another.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "getgrav/grav"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.7.21"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/getgrav/grav/commit/c51fb1779b83f620c0b6f3548d4a96322b55df07"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/getgrav/grav"
  }, {
    "type" : "WEB",
    "url" : "https://huntr.dev/bounties/c2bc65af-7b93-4020-886e-8cdaeb0a58ea"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-565" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-09-28T20:32:37Z",
    "nvd_published_at" : "2021-09-27T13:15:00Z"
  }
}