CVE-2021-38187: Anymap Incorrect Cast Vulnerability

CRITICAL
Advisory Identifier: GHSA-hc92-9h3m-c39j
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CVSS 9.8
CWE-681 CWE-704
Published
Advisory Summary

CVE-2021-38187 is a CRITICAL (CVSS 9.8) incorrect cast vulnerability (CWE-681: Incorrect Conversion between Numeric Types) affecting Anymap libraries in the crates.io ecosystem. The issue involves incorrect cast in anymap. Remediation is available in the latest vendor maintenance releases.

CVE-2021-38187 at a Glance

CVE Identifier CVE-2021-38187
GHSA Identifier GHSA-hc92-9h3m-c39j
Severity CRITICAL
CVSS v3.1 Base Score 9.8
CWE Classification CWE-681: Incorrect Conversion between Numeric Types
Affected Product Anymap
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-2021-38187

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

anymap fixed: Latest secure release 
Upgrade anymap 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 anymap

How to Check if You Are Affected

To determine whether your application is affected by CVE-2021-38187, inspect your project dependencies for Anymap:

inspect dependencies for anymap

Analyze the terminal output to locate any version of Anymap 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-681: Incorrect Conversion between Numeric Types, where when converting from one data type to another, such as long to integer, data can be omitted or translated in a way that produces unexpected values. if the resulting values are used in a sensitive context, then dangerous behaviors may occur. In Anymap, 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

An issue was discovered in the anymap crate through 0.12.1 for Rust. It violates soundness via conversion of a *u8 to a *u64.

CVE-2021-38187 Affected Anymap Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
anymap
 crates.io
≤ 0.12.1

References

NVD — CVE-2021-38187 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-38187
Anymap Source Repository REPOSITORY
https://github.com/chris-morgan/anymap/issues/37
Anymap Source Repository REPOSITORY
https://github.com/chris-morgan/anymap
rustsec.org/advisories/rustsec-... WEB
https://rustsec.org/advisories/RUSTSEC-2021-0065.html

Frequently Asked Questions

What is CVE-2021-38187?
CVE-2021-38187 is a security vulnerability in Anymap involving Incorrect cast in anymap under CWE-681: Incorrect Conversion between Numeric Types.
Which Anymap versions are affected?
Affected versions include releases prior to current release patches across affected packages: anymap.
What version fixes CVE-2021-38187?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is anymap affected?
Yes, anymap 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-2021-38187?
CVE-2021-38187 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-2021-38187?
CVE-2021-38187 is classified under CWE-681: Incorrect Conversion between Numeric Types (When converting from one data type to another, such as long to integer, data can be omitted or translated in a way that produces unexpected values. If the resulting values are used in a sensitive context, then dangerous behaviors may occur.).
How can I check crates.io dependencies for CVE-2021-38187?
Run the dependency tree command: 'inspect dependencies for anymap'. 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-hc92-9h3m-c39j",
  "modified" : "2021-08-18T21:32:29Z",
  "published" : "2021-08-25T20:55:45Z",
  "aliases" : [ "CVE-2021-38187" ],
  "summary" : "Incorrect cast in anymap",
  "details" : "An issue was discovered in the anymap crate through 0.12.1 for Rust. It violates soundness via conversion of a *u8 to a *u64.",
  "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" : "anymap"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "0.12.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-38187"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/chris-morgan/anymap/issues/37"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/chris-morgan/anymap"
  }, {
    "type" : "WEB",
    "url" : "https://rustsec.org/advisories/RUSTSEC-2021-0065.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-681", "CWE-704" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-08-18T21:32:29Z",
    "nvd_published_at" : "2021-08-08T06:15:00Z"
  }
}