CVE-2020-35711: Dangling reference in `access :Map` With Constant Vulnerability

HIGH
Advisory Identifier: GHSA-9pqx-g3jh-qpqq
Share
CVSS 7.5
Published
Advisory Summary

CVE-2020-35711 is a HIGH (CVSS 7.5) :map` with constant vulnerability (General Security Weakness) affecting Dangling reference in `access libraries in the crates.io ecosystem. The issue involves :map` with constant. Remediation is available by upgrading affected packages to version 0.4.8, 1.1.0.

CVE-2020-35711 at a Glance

CVE Identifier CVE-2020-35711
GHSA Identifier GHSA-9pqx-g3jh-qpqq
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification General Security Weakness
Affected Product Dangling reference in `access
Package Ecosystem crates.io
Published Date
Last Updated

Security Impact

CVSS: 7.5

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:N/I:N/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 None (C:N)
Integrity None (I:N)
Availability High (A:H)

How to Fix CVE-2020-35711

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

arc-swap fixed: 0.4.8 
Upgrade arc-swap to 0.4.8
arc-swap fixed: 1.1.0 
Upgrade arc-swap to 1.1.0
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 arc-swap

How to Check if You Are Affected

To determine whether your application is affected by CVE-2020-35711, inspect your project dependencies for Dangling reference in `access:

inspect dependencies for arc-swap

Analyze the terminal output to locate any version of Dangling reference in `access in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.4.8), 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 General Security Weakness. In Dangling reference in `access, 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 has been discovered in the arc-swap crate before 0.4.8 (and 1.x before 1.1.0) for Rust. Use of arc_swap::access::Map with the Constant test helper (or with a user-supplied implementation of the Access trait) could sometimes lead to dangling references being returned by the map.

CVE-2020-35711 Affected Dangling reference in `access Versions

2 component(s)
Fixed Versions:
0.4.81.1.0
Product / Package Ecosystem Affected Versions Fixed Version
arc-swap
 crates.io
≥ 0.4.2
< 0.4.8
0.4.8
arc-swap
 crates.io
≥ 1.0.0
< 1.1.0
1.1.0

References

NVD — CVE-2020-35711 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-35711
Dangling reference in `access Source Repository REPOSITORY
https://github.com/vorner/arc-swap/issues/45
Dangling reference in `access Source Repository REPOSITORY
https://github.com/vorner/arc-swap
rustsec.org/advisories/rustsec-... WEB
https://rustsec.org/advisories/RUSTSEC-2020-0091.html

Frequently Asked Questions

What is CVE-2020-35711?
CVE-2020-35711 is a security vulnerability in Dangling reference in `access involving :Map` with Constant under General Security Weakness.
Which Dangling reference in `access versions are affected?
Affected versions include releases prior to 0.4.8, 1.1.0 across affected packages: arc-swap.
What version fixes CVE-2020-35711?
Upgrading to 0.4.8, 1.1.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is arc-swap affected?
Yes, arc-swap is affected in releases prior to 0.4.8, 1.1.0. Upgrade your dependency to 0.4.8, 1.1.0 or later.
What is the CVSS score of CVE-2020-35711?
CVE-2020-35711 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with CVE-2020-35711?
CVE-2020-35711 is classified under General Security Weakness.
How can I check crates.io dependencies for CVE-2020-35711?
Run the dependency tree command: 'inspect dependencies for arc-swap'. 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-9pqx-g3jh-qpqq",
  "modified" : "2022-06-16T23:22:40Z",
  "published" : "2022-05-24T17:37:21Z",
  "aliases" : [ "CVE-2020-35711" ],
  "summary" : "Dangling reference in `access::Map` with Constant",
  "details" : "An issue has been discovered in the arc-swap crate before 0.4.8 (and 1.x before 1.1.0) for Rust. Use of arc_swap::access::Map with the Constant test helper (or with a user-supplied implementation of the Access trait) could sometimes lead to dangling references being returned by the map.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "crates.io",
      "name" : "arc-swap"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0.4.2"
      }, {
        "fixed" : "0.4.8"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "crates.io",
      "name" : "arc-swap"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "1.0.0"
      }, {
        "fixed" : "1.1.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-35711"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/vorner/arc-swap/issues/45"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/vorner/arc-swap"
  }, {
    "type" : "WEB",
    "url" : "https://rustsec.org/advisories/RUSTSEC-2020-0091.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-06-16T23:22:40Z",
    "nvd_published_at" : "2020-12-25T23:15:00Z"
  }
}