CVE-2021-27185: Samba client Command Injection Vulnerability

CRITICAL
Advisory Identifier: GHSA-r3j7-x2g5-9gx6
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CVSS 9.8
CWE-78 CWE-74 CWE-77
Published
Advisory Summary

CVE-2021-27185 is a CRITICAL (CVSS 9.8) command injection vulnerability (CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')) affecting Samba client libraries in the npm ecosystem. The issue involves command injection in samba-client. Remediation is available by upgrading affected packages to version 4.0.0.

CVE-2021-27185 at a Glance

CVE Identifier CVE-2021-27185
GHSA Identifier GHSA-r3j7-x2g5-9gx6
Severity CRITICAL
CVSS v3.1 Base Score 9.8
CWE Classification CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Affected Product Samba client
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 9.8

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

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
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-2021-27185

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

samba-client fixed: 4.0.0 
npm install samba-client@4.0.0
Verify Direct and Transitive Dependencies

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

npm ls samba-client

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2021-27185, inspect your project dependencies using npm:

npm ls samba-client

Analyze the terminal output to locate any version of Samba client in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 4.0.0), your application is affected.

Note: The npm ls samba-client command inspects dependencies declared in your package.json and lockfile; it does not perform automated runtime dynamic scanning.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection'), where the product constructs all or part of an os command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended os command when it is sent to a downstream component. In Samba client, 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 samba-client package before 4.0.0 for Node.js allows command injection because of the use of process.exec.

CVE-2021-27185 Affected Samba client Versions

1 component(s)
Fixed Versions:
4.0.0
Product / Package Ecosystem Affected Versions Fixed Version
samba-client
npm/samba-client
npm
< 4.0.0
4.0.0

References

NVD — CVE-2021-27185 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-27185
Security Fix Commit FIX COMMIT
https://github.com/eflexsystems/node-samba-client/commit/5bc3bbad9b8d02243bc861a11ec73f788fbb1235
advisory.checkmarx.net/advisory/cx-2021-43... WEB
https://advisory.checkmarx.net/advisory/CX-2021-4302
Samba client Source Repository REPOSITORY
https://github.com/eflexsystems/node-samba-client
Samba client Release RELEASE
https://github.com/eflexsystems/node-samba-client/releases/tag/4.0.0
Samba client Security Information SECURITY
https://security.netapp.com/advisory/ntap-20210319-0002
www.npmjs.com/package/samba-clien... WEB
https://www.npmjs.com/package/samba-client

Frequently Asked Questions

What is CVE-2021-27185?
CVE-2021-27185 is a security vulnerability in Samba client involving Command injection in samba-client under CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection').
Which Samba client versions are affected?
Affected versions include releases prior to 4.0.0 across affected packages: samba-client.
What version fixes CVE-2021-27185?
Upgrading to 4.0.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is samba-client affected?
Yes, samba-client is affected in releases prior to 4.0.0. Upgrade your dependency to 4.0.0 or later.
What is the CVSS score of CVE-2021-27185?
CVE-2021-27185 has a CVSS v3.1 base score of 9.8 (CRITICAL) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2021-27185?
CVE-2021-27185 is classified under CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') (The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.).
How can I check npm dependencies for CVE-2021-27185?
Run the dependency tree command: 'npm ls samba-client'. 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-r3j7-x2g5-9gx6",
  "modified" : "2022-05-03T03:44:37Z",
  "published" : "2021-02-11T20:47:27Z",
  "aliases" : [ "CVE-2021-27185" ],
  "summary" : "Command injection in samba-client",
  "details" : "The samba-client package before 4.0.0 for Node.js allows command injection because of the use of process.exec.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "samba-client"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "4.0.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-27185"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/eflexsystems/node-samba-client/commit/5bc3bbad9b8d02243bc861a11ec73f788fbb1235"
  }, {
    "type" : "WEB",
    "url" : "https://advisory.checkmarx.net/advisory/CX-2021-4302"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/eflexsystems/node-samba-client"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/eflexsystems/node-samba-client/releases/tag/4.0.0"
  }, {
    "type" : "WEB",
    "url" : "https://security.netapp.com/advisory/ntap-20210319-0002"
  }, {
    "type" : "WEB",
    "url" : "https://www.npmjs.com/package/samba-client"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-74", "CWE-77", "CWE-78" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-02-11T18:18:32Z",
    "nvd_published_at" : "2021-02-10T22:15:00Z"
  }
}