CVE-2020-35860: Cbox NULL Pointer Dereference Vulnerability

CRITICAL
Advisory Identifier: GHSA-3vjm-36rr-7qrq
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CVSS 9.8
CWE-476
Published
Advisory Summary

CVE-2020-35860 is a CRITICAL (CVSS 9.8) null pointer dereference vulnerability (CWE-476: NULL Pointer Dereference) affecting Cbox libraries in the crates.io ecosystem. The issue involves null pointer dereference in cbox. Remediation is available in the latest vendor maintenance releases.

CVE-2020-35860 at a Glance

CVE Identifier CVE-2020-35860
GHSA Identifier GHSA-3vjm-36rr-7qrq
Severity CRITICAL
CVSS v3.1 Base Score 9.8
CWE Classification CWE-476: NULL Pointer Dereference
Affected Product Cbox
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-2020-35860

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

cbox fixed: Latest secure release 
Upgrade cbox 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 cbox

How to Check if You Are Affected

To determine whether your application is affected by CVE-2020-35860, inspect your project dependencies for Cbox:

inspect dependencies for cbox

Analyze the terminal output to locate any version of Cbox 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-476: NULL Pointer Dereference, where the product dereferences a pointer that it expects to be valid but is null. In Cbox, 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 cbox crate through 2020-03-19 for Rust. The CBox API allows dereferencing raw pointers without a requirement for unsafe code.

CVE-2020-35860 Affected Cbox Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
cbox
 crates.io
≤ 0.3.0

References

NVD — CVE-2020-35860 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-35860
Cbox Source Repository REPOSITORY
https://github.com/TomBebbington/cbox-rs/issues/2
Cbox Source Repository REPOSITORY
https://github.com/TomBebbington/cbox-rs
rustsec.org/advisories/rustsec-... WEB
https://rustsec.org/advisories/RUSTSEC-2020-0005.html

Frequently Asked Questions

What is CVE-2020-35860?
CVE-2020-35860 is a security vulnerability in Cbox involving NULL Pointer Dereference in cbox under CWE-476: NULL Pointer Dereference.
Which Cbox versions are affected?
Affected versions include releases prior to current release patches across affected packages: cbox.
What version fixes CVE-2020-35860?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is cbox affected?
Yes, cbox 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-2020-35860?
CVE-2020-35860 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-2020-35860?
CVE-2020-35860 is classified under CWE-476: NULL Pointer Dereference (The product dereferences a pointer that it expects to be valid but is NULL.).
How can I check crates.io dependencies for CVE-2020-35860?
Run the dependency tree command: 'inspect dependencies for cbox'. 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-3vjm-36rr-7qrq",
  "modified" : "2021-08-19T21:18:36Z",
  "published" : "2021-08-25T20:47:16Z",
  "aliases" : [ "CVE-2020-35860" ],
  "summary" : "NULL Pointer Dereference in cbox",
  "details" : "An issue was discovered in the cbox crate through 2020-03-19 for Rust. The CBox API allows dereferencing raw pointers without a requirement for unsafe code.",
  "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" : "cbox"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "0.3.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-35860"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/TomBebbington/cbox-rs/issues/2"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/TomBebbington/cbox-rs"
  }, {
    "type" : "WEB",
    "url" : "https://rustsec.org/advisories/RUSTSEC-2020-0005.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-476" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-08-19T21:18:36Z",
    "nvd_published_at" : null
  }
}