CVE-2020-35874: Internment Use After Free Vulnerability

HIGH
Advisory Identifier: GHSA-96w3-p368-4h8c
Share
CVSS 8.1
CWE-362
Published
Advisory Summary

CVE-2020-35874 is a HIGH (CVSS 8.1) use after free vulnerability (CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')) affecting Internment libraries in the crates.io ecosystem. The issue involves use after free in internment. Remediation is available by upgrading affected packages to version 0.4.0.

CVE-2020-35874 at a Glance

CVE Identifier CVE-2020-35874
GHSA Identifier GHSA-96w3-p368-4h8c
Severity HIGH
CVSS v3.1 Base Score 8.1
CWE Classification CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
Affected Product Internment
Package Ecosystem crates.io
Published Date
Last Updated

Security Impact

CVSS: 8.1

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H).

Attack Vector Network (AV:N)
Attack Complexity High (AC:H)
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-2020-35874

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

internment fixed: 0.4.0 
Upgrade internment to 0.4.0
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 internment

How to Check if You Are Affected

To determine whether your application is affected by CVE-2020-35874, inspect your project dependencies for Internment:

inspect dependencies for internment

Analyze the terminal output to locate any version of Internment in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.4.0), 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-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition'), where the product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently. In Internment, 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

ArcIntern::drop has a race condition where it can release memory which is about to get another user. The new user will get a reference to freed memory. This was fixed by serializing access to an interned object while it is being deallocated. Versions prior to 0.3.12 used stronger locking which avoided the problem.

CVE-2020-35874 Affected Internment Versions

1 component(s)
Fixed Versions:
0.4.0
Product / Package Ecosystem Affected Versions Fixed Version
internment
 crates.io
≥ 0.3.12
< 0.4.0
0.4.0

References

NVD — CVE-2020-35874 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-35874
Internment Source Repository REPOSITORY
https://github.com/droundy/internment/issues/11
Internment Source Repository REPOSITORY
https://github.com/droundy/internment
rustsec.org/advisories/rustsec-... WEB
https://rustsec.org/advisories/RUSTSEC-2020-0017.html

Frequently Asked Questions

What is CVE-2020-35874?
CVE-2020-35874 is a security vulnerability in Internment involving Use after free in internment under CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition').
Which Internment versions are affected?
Affected versions include releases prior to 0.4.0 across affected packages: internment.
What version fixes CVE-2020-35874?
Upgrading to 0.4.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is internment affected?
Yes, internment is affected in releases prior to 0.4.0. Upgrade your dependency to 0.4.0 or later.
What is the CVSS score of CVE-2020-35874?
CVE-2020-35874 has a CVSS v3.1 base score of 8.1 (HIGH) with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2020-35874?
CVE-2020-35874 is classified under CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') (The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.).
How can I check crates.io dependencies for CVE-2020-35874?
Run the dependency tree command: 'inspect dependencies for internment'. 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-96w3-p368-4h8c",
  "modified" : "2023-06-13T18:17:00Z",
  "published" : "2021-08-25T20:46:51Z",
  "aliases" : [ "CVE-2020-35874" ],
  "summary" : "Use after free in internment",
  "details" : "ArcIntern::drop has a race condition where it can release memory which is about to get another user. The new user will get a reference to freed memory.\n\nThis was fixed by serializing access to an interned object while it is being deallocated.\n\nVersions prior to 0.3.12 used stronger locking which avoided the problem.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "crates.io",
      "name" : "internment"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0.3.12"
      }, {
        "fixed" : "0.4.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-35874"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/droundy/internment/issues/11"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/droundy/internment"
  }, {
    "type" : "WEB",
    "url" : "https://rustsec.org/advisories/RUSTSEC-2020-0017.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-362" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-08-19T21:19:06Z",
    "nvd_published_at" : null
  }
}