CVE-2021-45704: Metrics util Out-of-bounds Write And Race Condition Vulnerability

HIGH
Advisory Identifier: GHSA-cwvc-87xq-pc5m
Share
CVSS 8.1
CWE-362 CWE-787
Published
Advisory Summary

CVE-2021-45704 is a HIGH (CVSS 8.1) out-of-bounds write and race condition vulnerability (CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')) affecting Metrics util libraries in the crates.io ecosystem. The issue involves out-of-bounds write and race condition in metrics-util. Remediation is available by upgrading affected packages to version 0.7.0.

CVE-2021-45704 at a Glance

CVE Identifier CVE-2021-45704
GHSA Identifier GHSA-cwvc-87xq-pc5m
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 Metrics util
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-2021-45704

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

metrics-util fixed: 0.7.0 
Upgrade metrics-util to 0.7.0
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 metrics-util

How to Check if You Are Affected

To determine whether your application is affected by CVE-2021-45704, inspect your project dependencies for Metrics util:

inspect dependencies for metrics-util

Analyze the terminal output to locate any version of Metrics util in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.7.0), 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 Metrics util, 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

In the affected versions of the crate, AtomicBucket<T> unconditionally implements Send/Sync traits. Therefore, users can create a data race to the inner T: !Sync by using the AtomicBucket::data_with() API. Such data races can potentially cause memory corruption or other undefined behavior. The flaw was fixed in commit 8e6daab by adding appropriate Send/Sync bounds to the Send/Sync impl of struct Block<T> (which is a data type contained inside AtomicBucket<T>).

CVE-2021-45704 Affected Metrics util Versions

1 component(s)
Fixed Versions:
0.7.0
Product / Package Ecosystem Affected Versions Fixed Version
metrics-util
 crates.io
< 0.7.0
0.7.0

References

NVD — CVE-2021-45704 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-45704
Metrics util Source Repository REPOSITORY
https://github.com/metrics-rs/metrics/issues/190
Security Fix Commit FIX COMMIT
https://github.com/metrics-rs/metrics/commit/8e6daab
Metrics util Source Repository REPOSITORY
https://github.com/metrics-rs/metrics
raw.githubusercontent.com/rustsec/advisory-db... WEB
https://raw.githubusercontent.com/rustsec/advisory-db/main/crates/metrics-util/RUSTSEC-2021-0113.md
rustsec.org/advisories/rustsec-... WEB
https://rustsec.org/advisories/RUSTSEC-2021-0113.html

Frequently Asked Questions

What is CVE-2021-45704?
CVE-2021-45704 is a security vulnerability in Metrics util involving Out-of-bounds Write and Race Condition in metrics-util under CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition').
Which Metrics util versions are affected?
Affected versions include releases prior to 0.7.0 across affected packages: metrics-util.
What version fixes CVE-2021-45704?
Upgrading to 0.7.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is metrics-util affected?
Yes, metrics-util is affected in releases prior to 0.7.0. Upgrade your dependency to 0.7.0 or later.
What is the CVSS score of CVE-2021-45704?
CVE-2021-45704 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-2021-45704?
CVE-2021-45704 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-2021-45704?
Run the dependency tree command: 'inspect dependencies for metrics-util'. 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-cwvc-87xq-pc5m",
  "modified" : "2023-06-13T18:14:16Z",
  "published" : "2022-01-06T22:08:43Z",
  "aliases" : [ "CVE-2021-45704" ],
  "summary" : "Out-of-bounds Write and Race Condition in metrics-util",
  "details" : "In the affected versions of the crate, AtomicBucket<T> unconditionally implements Send/Sync traits. Therefore, users can create a data race to the inner T: !Sync by using the AtomicBucket::data_with() API. Such data races can potentially cause memory corruption or other undefined behavior.\n\nThe flaw was fixed in commit 8e6daab by adding appropriate Send/Sync bounds to the Send/Sync impl of struct Block<T> (which is a data type contained inside AtomicBucket<T>).",
  "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" : "metrics-util"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.7.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-45704"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/metrics-rs/metrics/issues/190"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/metrics-rs/metrics/commit/8e6daab"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/metrics-rs/metrics"
  }, {
    "type" : "WEB",
    "url" : "https://raw.githubusercontent.com/rustsec/advisory-db/main/crates/metrics-util/RUSTSEC-2021-0113.md"
  }, {
    "type" : "WEB",
    "url" : "https://rustsec.org/advisories/RUSTSEC-2021-0113.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-362", "CWE-787" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-01-05T23:21:30Z",
    "nvd_published_at" : "2021-12-27T00:15:00Z"
  }
}