CVE-2021-30130: Phpseclib/phpseclib Improper Certificate Validation Vulnerability

HIGH
Advisory Identifier: GHSA-vf4w-fg7r-5v94
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CVSS 7.5
CWE-295 CWE-347
Published
Advisory Summary

CVE-2021-30130 is a HIGH (CVSS 7.5) improper certificate validation vulnerability (CWE-295: Improper Certificate Validation) affecting Phpseclib/phpseclib libraries in the Packagist ecosystem. The issue involves improper certificate validation in phpseclib. Remediation is available by upgrading affected packages to version 3.0.7, 2.0.31.

CVE-2021-30130 at a Glance

CVE Identifier CVE-2021-30130
GHSA Identifier GHSA-vf4w-fg7r-5v94
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-295: Improper Certificate Validation
Affected Product Phpseclib/phpseclib
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 7.5

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:N/I:H/A:N).

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 None (C:N)
Integrity High (I:H)
Availability None (A:N)

How to Fix CVE-2021-30130

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

phpseclib/phpseclib fixed: 3.0.7 
Upgrade phpseclib/phpseclib to 3.0.7
phpseclib/phpseclib fixed: 2.0.31 
Upgrade phpseclib/phpseclib to 2.0.31
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 phpseclib/phpseclib

How to Check if You Are Affected

To determine whether your application is affected by CVE-2021-30130, inspect your project dependencies for Phpseclib/phpseclib:

inspect dependencies for phpseclib/phpseclib

Analyze the terminal output to locate any version of Phpseclib/phpseclib in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 3.0.7), 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-295: Improper Certificate Validation, where the product does not validate, or incorrectly validates, a certificate. In Phpseclib/phpseclib, 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

phpseclib before 2.0.31 and 3.x before 3.0.7 mishandles RSA PKCS#1 v1.5 signature verification.

CVE-2021-30130 Affected Phpseclib/phpseclib Versions

2 component(s)
Fixed Versions:
3.0.72.0.31
Product / Package Ecosystem Affected Versions Fixed Version
phpseclib/phpseclib
 Packagist
≥ 3.0.0
< 3.0.7
3.0.7
phpseclib/phpseclib
 Packagist
< 2.0.31
2.0.31

References

NVD — CVE-2021-30130 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-30130
Phpseclib/phpseclib Source Repository REPOSITORY
https://github.com/phpseclib/phpseclib/pull/1635
Phpseclib/phpseclib Source Repository REPOSITORY
https://github.com/FriendsOfPHP/security-advisories/blob/master/phpseclib/phpseclib/CVE-2021-30130.yaml
Phpseclib/phpseclib Release RELEASE
https://github.com/phpseclib/phpseclib/releases/tag/2.0.31
Phpseclib/phpseclib Release RELEASE
https://github.com/phpseclib/phpseclib/releases/tag/3.0.7
lists.debian.org/debian-lts-announce... WEB
https://lists.debian.org/debian-lts-announce/2022/11/msg00024.html
lists.debian.org/debian-lts-announce... WEB
https://lists.debian.org/debian-lts-announce/2022/11/msg00025.html

Frequently Asked Questions

What is CVE-2021-30130?
CVE-2021-30130 is a security vulnerability in Phpseclib/phpseclib involving Improper Certificate Validation in phpseclib under CWE-295: Improper Certificate Validation.
Which Phpseclib/phpseclib versions are affected?
Affected versions include releases prior to 3.0.7, 2.0.31 across affected packages: phpseclib/phpseclib.
What version fixes CVE-2021-30130?
Upgrading to 3.0.7, 2.0.31 (or the latest patched release for your respective branch) resolves the vulnerability.
Is phpseclib/phpseclib affected?
Yes, phpseclib/phpseclib is affected in releases prior to 3.0.7, 2.0.31. Upgrade your dependency to 3.0.7, 2.0.31 or later.
What is the CVSS score of CVE-2021-30130?
CVE-2021-30130 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.
What CWE is associated with CVE-2021-30130?
CVE-2021-30130 is classified under CWE-295: Improper Certificate Validation (The product does not validate, or incorrectly validates, a certificate.).
How can I check Packagist dependencies for CVE-2021-30130?
Run the dependency tree command: 'inspect dependencies for phpseclib/phpseclib'. 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-vf4w-fg7r-5v94",
  "modified" : "2021-04-23T00:22:49Z",
  "published" : "2021-04-07T20:56:55Z",
  "aliases" : [ "CVE-2021-30130" ],
  "summary" : "Improper Certificate Validation in phpseclib",
  "details" : "phpseclib before 2.0.31 and 3.x before 3.0.7 mishandles RSA PKCS#1 v1.5 signature verification.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "phpseclib/phpseclib"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "3.0.0"
      }, {
        "fixed" : "3.0.7"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "phpseclib/phpseclib"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2.0.31"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-30130"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/phpseclib/phpseclib/pull/1635"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/FriendsOfPHP/security-advisories/blob/master/phpseclib/phpseclib/CVE-2021-30130.yaml"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/phpseclib/phpseclib/releases/tag/2.0.31"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/phpseclib/phpseclib/releases/tag/3.0.7"
  }, {
    "type" : "WEB",
    "url" : "https://lists.debian.org/debian-lts-announce/2022/11/msg00024.html"
  }, {
    "type" : "WEB",
    "url" : "https://lists.debian.org/debian-lts-announce/2022/11/msg00025.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-295", "CWE-347" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-04-07T17:29:49Z",
    "nvd_published_at" : "2021-04-06T15:15:00Z"
  }
}