CVE-2021-38556: Billz/raspap webgui Command Injection Vulnerability

HIGH
Advisory Identifier: GHSA-7vph-p634-vrqf
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CVSS 8.8
CWE-77
Published
Advisory Summary

CVE-2021-38556 is a HIGH (CVSS 8.8) command injection vulnerability (CWE-77: Improper Neutralization of Special Elements used in a Command ('Command Injection')) affecting Billz/raspap webgui libraries in the Packagist ecosystem. The issue involves command injection in raspap 2.6.6. Remediation is available in the latest vendor maintenance releases.

CVE-2021-38556 at a Glance

CVE Identifier CVE-2021-38556
GHSA Identifier GHSA-7vph-p634-vrqf
Severity HIGH
CVSS v3.1 Base Score 8.8
CWE Classification CWE-77: Improper Neutralization of Special Elements used in a Command ('Command Injection')
Affected Product Billz/raspap webgui
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:3.1/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-2021-38556

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

billz/raspap-webgui fixed: Latest secure release 
Upgrade billz/raspap-webgui to Latest secure release
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 billz/raspap-webgui

How to Check if You Are Affected

To determine whether your application is affected by CVE-2021-38556, inspect your project dependencies for Billz/raspap webgui:

inspect dependencies for billz/raspap-webgui

Analyze the terminal output to locate any version of Billz/raspap webgui in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), 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-77: Improper Neutralization of Special Elements used in a Command ('Command Injection'), where the product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component. In Billz/raspap webgui, 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

includes/configure_client.php in RaspAP 2.6.6 allows attackers to execute commands via command injection.

CVE-2021-38556 Affected Billz/raspap webgui Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
billz/raspap-webgui
 Packagist
≤ 2.6.6

References

NVD — CVE-2021-38556 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-38556
Billz/raspap webgui Source Repository REPOSITORY
https://github.com/RaspAP/raspap-webgui
Billz/raspap webgui Source Repository REPOSITORY
https://github.com/RaspAP/raspap-webgui/blob/0e1d652c5e55f812aaf2a5908884e9db179416ee/includes/configure_client.php
Billz/raspap webgui Security Information SECURITY
https://zerosecuritypenetrationtesting.com/?page_id=306

Frequently Asked Questions

What is CVE-2021-38556?
CVE-2021-38556 is a security vulnerability in Billz/raspap webgui involving Command Injection in RaspAP 2.6.6 under CWE-77: Improper Neutralization of Special Elements used in a Command ('Command Injection').
Which Billz/raspap webgui versions are affected?
Affected versions include releases prior to current release patches across affected packages: billz/raspap-webgui.
What version fixes CVE-2021-38556?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is billz/raspap-webgui affected?
Yes, billz/raspap-webgui is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.
What is the CVSS score of CVE-2021-38556?
CVE-2021-38556 has a CVSS v3.1 base score of 8.8 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2021-38556?
CVE-2021-38556 is classified under CWE-77: Improper Neutralization of Special Elements used in a Command ('Command Injection') (The product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component.).
How can I check Packagist dependencies for CVE-2021-38556?
Run the dependency tree command: 'inspect dependencies for billz/raspap-webgui'. 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-7vph-p634-vrqf",
  "modified" : "2021-09-03T20:35:52Z",
  "published" : "2021-09-02T17:11:00Z",
  "aliases" : [ "CVE-2021-38556" ],
  "summary" : "Command Injection in RaspAP 2.6.6",
  "details" : "includes/configure_client.php in RaspAP 2.6.6 allows attackers to execute commands via command injection.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "billz/raspap-webgui"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "2.6.6"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-38556"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/RaspAP/raspap-webgui"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/RaspAP/raspap-webgui/blob/0e1d652c5e55f812aaf2a5908884e9db179416ee/includes/configure_client.php"
  }, {
    "type" : "WEB",
    "url" : "https://zerosecuritypenetrationtesting.com/?page_id=306"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-77" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-08-25T19:47:52Z",
    "nvd_published_at" : "2021-08-24T13:15:00Z"
  }
}