CVE-2020-35887: Arr Multiple Security Issues Including Data Vulnerability

CRITICAL
Advisory Identifier: GHSA-fhvj-7f9p-w788
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CVSS 9.8
CWE-120
Published
Advisory Summary

CVE-2020-35887 is a CRITICAL (CVSS 9.8) multiple security issues including data vulnerability (CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')) affecting Arr libraries in the crates.io ecosystem. The issue involves multiple security issues including data race, buffer overflow, and uninitialized memory drop in arr. Remediation is available in the latest vendor maintenance releases.

CVE-2020-35887 at a Glance

CVE Identifier CVE-2020-35887
GHSA Identifier GHSA-fhvj-7f9p-w788
Severity CRITICAL
CVSS v3.1 Base Score 9.8
CWE Classification CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
Affected Product Arr
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-2020-35887

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

arr fixed: Latest secure release 
Upgrade arr 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 arr

How to Check if You Are Affected

To determine whether your application is affected by CVE-2020-35887, inspect your project dependencies for Arr:

inspect dependencies for arr

Analyze the terminal output to locate any version of Arr 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-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow'), where the product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer. In Arr, 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

arr crate contains multiple security issues. Specifically, 1. It incorrectly implements Sync/Send bounds, which allows to smuggle non-Sync/Send types across the thread boundary. 2. Index and IndexMut implementation does not check the array bound. 3. Array::new_from_template() drops uninitialized memory.

CVE-2020-35887 Affected Arr Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
arr
 crates.io
≤ 0.6.1

References

NVD — CVE-2020-35887 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-35887
Arr Source Repository REPOSITORY
https://github.com/sjep/array/issues/1
Arr Source Repository REPOSITORY
https://github.com/sjep/array
rustsec.org/advisories/rustsec-... WEB
https://rustsec.org/advisories/RUSTSEC-2020-0034.html

Frequently Asked Questions

What is CVE-2020-35887?
CVE-2020-35887 is a security vulnerability in Arr involving Multiple security issues including data race, buffer overflow, and uninitialized memory drop in arr under CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow').
Which Arr versions are affected?
Affected versions include releases prior to current release patches across affected packages: arr.
What version fixes CVE-2020-35887?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is arr affected?
Yes, arr 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-2020-35887?
CVE-2020-35887 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-2020-35887?
CVE-2020-35887 is classified under CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') (The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer.).
How can I check crates.io dependencies for CVE-2020-35887?
Run the dependency tree command: 'inspect dependencies for arr'. 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-fhvj-7f9p-w788",
  "modified" : "2023-06-13T16:51:18Z",
  "published" : "2021-08-25T20:48:54Z",
  "aliases" : [ "CVE-2020-35887" ],
  "summary" : "Multiple security issues including data race, buffer overflow, and uninitialized memory drop in arr",
  "details" : "arr crate contains multiple security issues. Specifically,\n\n1.  It incorrectly implements Sync/Send bounds, which allows to smuggle non-Sync/Send types across the thread boundary.\n2. Index and IndexMut implementation does not check the array bound.\n3. Array::new_from_template() drops uninitialized memory.\n",
  "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" : "arr"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "0.6.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-35887"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/sjep/array/issues/1"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/sjep/array"
  }, {
    "type" : "WEB",
    "url" : "https://rustsec.org/advisories/RUSTSEC-2020-0034.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-120" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-08-19T20:56:25Z",
    "nvd_published_at" : null
  }
}