CVE-2021-30456: Id map Double-free Vulnerability

CRITICAL
Advisory Identifier: GHSA-vfqx-hv88-f9cv
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CVSS 9.8
CWE-415
Published
Advisory Summary

CVE-2021-30456 is a CRITICAL (CVSS 9.8) double-free vulnerability (CWE-415: Double Free) affecting Id map libraries in the crates.io ecosystem. The issue involves double-free in id-map. Remediation is available in the latest vendor maintenance releases.

CVE-2021-30456 at a Glance

CVE Identifier CVE-2021-30456
GHSA Identifier GHSA-vfqx-hv88-f9cv
Severity CRITICAL
CVSS v3.1 Base Score 9.8
CWE Classification CWE-415: Double Free
Affected Product Id map
Package Ecosystem crates.io
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-2021-30456

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

id-map fixed: Latest secure release 
Upgrade id-map 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 id-map

How to Check if You Are Affected

To determine whether your application is affected by CVE-2021-30456, inspect your project dependencies for Id map:

inspect dependencies for id-map

Analyze the terminal output to locate any version of Id map 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-415: Double Free, where the product calls free() twice on the same memory address. In Id map, 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

A double free can occur in get_or_insert upon a panic of a user-provided f function. get_or_insert reserves space for a value, before calling the user provided insertion function f. If the function f panics then uninitialized or previously freed memory can be dropped.

CVE-2021-30456 Affected Id map Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
id-map
 crates.io
≤ 0.2.1

References

NVD — CVE-2021-30456 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-30456
Id map Source Repository REPOSITORY
https://github.com/andrewhickman/id-map/issues/3
Id map Source Repository REPOSITORY
https://github.com/andrewhickman/id-map
rustsec.org/advisories/rustsec-... WEB
https://rustsec.org/advisories/RUSTSEC-2021-0052.html

Frequently Asked Questions

What is CVE-2021-30456?
CVE-2021-30456 is a security vulnerability in Id map involving Double-free in id-map under CWE-415: Double Free.
Which Id map versions are affected?
Affected versions include releases prior to current release patches across affected packages: id-map.
What version fixes CVE-2021-30456?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is id-map affected?
Yes, id-map 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-2021-30456?
CVE-2021-30456 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-2021-30456?
CVE-2021-30456 is classified under CWE-415: Double Free (The product calls free() twice on the same memory address.).
How can I check crates.io dependencies for CVE-2021-30456?
Run the dependency tree command: 'inspect dependencies for id-map'. 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-vfqx-hv88-f9cv",
  "modified" : "2023-06-13T18:19:49Z",
  "published" : "2021-08-25T20:55:22Z",
  "aliases" : [ "CVE-2021-30456" ],
  "summary" : "Double-free in id-map",
  "details" : "A double free can occur in get_or_insert upon a panic of a user-provided f function. get_or_insert reserves space for a value, before calling the user provided insertion function f. If the function f panics then uninitialized or previously freed memory can be dropped.",
  "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" : "crates.io",
      "name" : "id-map"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "0.2.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-30456"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/andrewhickman/id-map/issues/3"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/andrewhickman/id-map"
  }, {
    "type" : "WEB",
    "url" : "https://rustsec.org/advisories/RUSTSEC-2021-0052.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-415" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-08-19T17:04:13Z",
    "nvd_published_at" : null
  }
}