CVE-2020-25573: Linked hash map Access Of Uninitialized Pointer Vulnerability

CRITICAL
Advisory Identifier: GHSA-r43h-gmrm-h5c9
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CVSS 9.8
CWE-824
Published
Advisory Summary

CVE-2020-25573 is a CRITICAL (CVSS 9.8) access of uninitialized pointer vulnerability (CWE-824: Access of Uninitialized Pointer) affecting Linked hash map libraries in the crates.io ecosystem. The issue involves access of uninitialized pointer in linked-hash-map. Remediation is available by upgrading affected packages to version 0.5.3.

CVE-2020-25573 at a Glance

CVE Identifier CVE-2020-25573
GHSA Identifier GHSA-r43h-gmrm-h5c9
Severity CRITICAL
CVSS v3.1 Base Score 9.8
CWE Classification CWE-824: Access of Uninitialized Pointer
Affected Product Linked hash 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-2020-25573

To remediate this vulnerability, upgrade all affected Linked hash 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.

linked-hash-map fixed: 0.5.3 
Upgrade linked-hash-map to 0.5.3
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 linked-hash-map

How to Check if You Are Affected

To determine whether your application is affected by CVE-2020-25573, inspect your project dependencies for Linked hash map:

inspect dependencies for linked-hash-map

Analyze the terminal output to locate any version of Linked hash map in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.5.3), 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-824: Access of Uninitialized Pointer, where the product accesses or uses a pointer that has not been initialized. In Linked hash 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

An issue was discovered in the linked-hash-map crate before 0.5.3 for Rust. It creates an uninitialized NonNull pointer, which violates a non-null constraint.

CVE-2020-25573 Affected Linked hash map Versions

1 component(s)
Fixed Versions:
0.5.3
Product / Package Ecosystem Affected Versions Fixed Version
linked-hash-map
 crates.io
< 0.5.3
0.5.3

References

NVD — CVE-2020-25573 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-25573
Linked hash map Source Repository REPOSITORY
https://github.com/contain-rs/linked-hash-map/pull/100
Linked hash map Source Repository REPOSITORY
https://github.com/contain-rs/linked-hash-map
rustsec.org/advisories/rustsec-... WEB
https://rustsec.org/advisories/RUSTSEC-2020-0026.html

Frequently Asked Questions

What is CVE-2020-25573?
CVE-2020-25573 is a security vulnerability in Linked hash map involving Access of Uninitialized Pointer in linked-hash-map under CWE-824: Access of Uninitialized Pointer.
Which Linked hash map versions are affected?
Affected versions include releases prior to 0.5.3 across affected packages: linked-hash-map.
What version fixes CVE-2020-25573?
Upgrading to 0.5.3 (or the latest patched release for your respective branch) resolves the vulnerability.
Is linked-hash-map affected?
Yes, linked-hash-map is affected in releases prior to 0.5.3. Upgrade your dependency to 0.5.3 or later.
What is the CVSS score of CVE-2020-25573?
CVE-2020-25573 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-2020-25573?
CVE-2020-25573 is classified under CWE-824: Access of Uninitialized Pointer (The product accesses or uses a pointer that has not been initialized.).
How can I check crates.io dependencies for CVE-2020-25573?
Run the dependency tree command: 'inspect dependencies for linked-hash-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-r43h-gmrm-h5c9",
  "modified" : "2021-08-19T21:21:41Z",
  "published" : "2021-08-25T20:45:09Z",
  "aliases" : [ "CVE-2020-25573" ],
  "summary" : "Access of Uninitialized Pointer in linked-hash-map",
  "details" : "An issue was discovered in the linked-hash-map crate before 0.5.3 for Rust. It creates an uninitialized NonNull pointer, which violates a non-null constraint.",
  "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" : "linked-hash-map"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.5.3"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-25573"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/contain-rs/linked-hash-map/pull/100"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/contain-rs/linked-hash-map"
  }, {
    "type" : "WEB",
    "url" : "https://rustsec.org/advisories/RUSTSEC-2020-0026.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-824" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-08-19T21:21:41Z",
    "nvd_published_at" : "2020-09-14T19:15:00Z"
  }
}