CVE-2020-29556: Getgrav/grav Grav CMS Local File Injection Vulnerability

MODERATE
Advisory Identifier: GHSA-r3rg-jrjq-w4mr
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CVSS 5.5
CWE-22
Published
Advisory Summary

CVE-2020-29556 is a MODERATE (CVSS 5.5) grav cms local file injection vulnerability (CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')) affecting Getgrav/grav libraries in the Packagist ecosystem. The issue involves grav cms local file injection. Remediation is available by upgrading affected packages to version 1.6.30.

CVE-2020-29556 at a Glance

CVE Identifier CVE-2020-29556
GHSA Identifier GHSA-r3rg-jrjq-w4mr
Severity MODERATE
CVSS v3.1 Base Score 5.5
CWE Classification CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Affected Product Getgrav/grav
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 5.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N).

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

How to Fix CVE-2020-29556

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: Latest secure release 
Upgrade getgrav/grav to Latest secure release
getgrav/grav fixed: 1.6.30 
Upgrade getgrav/grav to 1.6.30
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-2020-29556, 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 1.6.30), 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-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal'), where the product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. 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

The Backup functionality in Grav CMS through 1.7.0-rc.17 allows an authenticated attacker to read arbitrary local files on the underlying server by exploiting a path-traversal technique. (This vulnerability can also be exploited by an unauthenticated attacker due to a lack of CSRF protection.)

CVE-2020-29556 Affected Getgrav/grav Versions

2 component(s)
Fixed Versions:
1.6.30
Product / Package Ecosystem Affected Versions Fixed Version
getgrav/grav
 Packagist
≥ 1.7.0-beta.1
≤ 1.7.0-rc.17
getgrav/grav
 Packagist
< 1.6.30
1.6.30

References

NVD — CVE-2020-29556 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-29556
blog.bssi.fr/cve-2020-29553-cve-... WEB
https://blog.bssi.fr/cve-2020-29553-cve-2020-29555-cve-2020-29556-multiple-vulnerabilities-within-cms-grav
Getgrav/grav Source Repository REPOSITORY
https://github.com/getgrav/grav

Frequently Asked Questions

What is CVE-2020-29556?
CVE-2020-29556 is a security vulnerability in Getgrav/grav involving Grav CMS Local File Injection under CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal').
Which Getgrav/grav versions are affected?
Affected versions include releases prior to 1.6.30 across affected packages: getgrav/grav.
What version fixes CVE-2020-29556?
Upgrading to 1.6.30 (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 Latest secure release, 1.6.30. Upgrade your dependency to Latest secure release, 1.6.30 or later.
What is the CVSS score of CVE-2020-29556?
CVE-2020-29556 has a CVSS v3.1 base score of 5.5 (MODERATE) with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.
What CWE is associated with CVE-2020-29556?
CVE-2020-29556 is classified under CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') (The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.).
How can I check Packagist dependencies for CVE-2020-29556?
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-r3rg-jrjq-w4mr",
  "modified" : "2024-04-24T22:05:43Z",
  "published" : "2022-05-24T17:44:32Z",
  "aliases" : [ "CVE-2020-29556" ],
  "summary" : "Grav CMS Local File Injection",
  "details" : "The Backup functionality in Grav CMS through 1.7.0-rc.17 allows an authenticated attacker to read arbitrary local files on the underlying server by exploiting a path-traversal technique. (This vulnerability can also be exploited by an unauthenticated attacker due to a lack of CSRF protection.)",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "getgrav/grav"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "1.7.0-beta.1"
      }, {
        "last_affected" : "1.7.0-rc.17"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "getgrav/grav"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.6.30"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-29556"
  }, {
    "type" : "WEB",
    "url" : "https://blog.bssi.fr/cve-2020-29553-cve-2020-29555-cve-2020-29556-multiple-vulnerabilities-within-cms-grav"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/getgrav/grav"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-22" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2024-04-24T22:05:43Z",
    "nvd_published_at" : "2021-03-15T18:15:00Z"
  }
}