CVE-2021-29937: Telemetry Free Of Uninitialized Memory Vulnerability

CRITICAL
Advisory Identifier: GHSA-hpcx-3pw8-g3j2
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CVSS 9.8
CWE-908
Published
Advisory Summary

CVE-2021-29937 is a CRITICAL (CVSS 9.8) free of uninitialized memory vulnerability (CWE-908: Use of Uninitialized Resource) affecting Telemetry libraries in the crates.io ecosystem. The issue involves free of uninitialized memory in telemetry. Remediation is available by upgrading affected packages to version 0.1.3.

CVE-2021-29937 at a Glance

CVE Identifier CVE-2021-29937
GHSA Identifier GHSA-hpcx-3pw8-g3j2
Severity CRITICAL
CVSS v3.1 Base Score 9.8
CWE Classification CWE-908: Use of Uninitialized Resource
Affected Product Telemetry
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-2021-29937

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

telemetry fixed: 0.1.3 
Upgrade telemetry to 0.1.3
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 telemetry

How to Check if You Are Affected

To determine whether your application is affected by CVE-2021-29937, inspect your project dependencies for Telemetry:

inspect dependencies for telemetry

Analyze the terminal output to locate any version of Telemetry in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.1.3), 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-908: Use of Uninitialized Resource, where the product uses or accesses a resource that has not been initialized. In Telemetry, 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 telemetry crate through 0.1.2 for Rust. There is a drop of uninitialized memory if a value.clone() call panics within misc::vec_with_size()

CVE-2021-29937 Affected Telemetry Versions

1 component(s)
Fixed Versions:
0.1.3
Product / Package Ecosystem Affected Versions Fixed Version
telemetry
 crates.io
< 0.1.3
0.1.3

References

NVD — CVE-2021-29937 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-29937
Telemetry Source Repository REPOSITORY
https://github.com/Yoric/telemetry.rs/issues/45
Security Fix Commit FIX COMMIT
https://github.com/Yoric/telemetry.rs/commit/2820cf12f2e08645fd6d1f15b4a90a54d6082a81
Telemetry Source Repository REPOSITORY
https://github.com/Yoric/telemetry.rs
rustsec.org/advisories/rustsec-... WEB
https://rustsec.org/advisories/RUSTSEC-2021-0046.html

Frequently Asked Questions

What is CVE-2021-29937?
CVE-2021-29937 is a security vulnerability in Telemetry involving Free of uninitialized memory in telemetry under CWE-908: Use of Uninitialized Resource.
Which Telemetry versions are affected?
Affected versions include releases prior to 0.1.3 across affected packages: telemetry.
What version fixes CVE-2021-29937?
Upgrading to 0.1.3 (or the latest patched release for your respective branch) resolves the vulnerability.
Is telemetry affected?
Yes, telemetry is affected in releases prior to 0.1.3. Upgrade your dependency to 0.1.3 or later.
What is the CVSS score of CVE-2021-29937?
CVE-2021-29937 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-2021-29937?
CVE-2021-29937 is classified under CWE-908: Use of Uninitialized Resource (The product uses or accesses a resource that has not been initialized.).
How can I check crates.io dependencies for CVE-2021-29937?
Run the dependency tree command: 'inspect dependencies for telemetry'. 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-hpcx-3pw8-g3j2",
  "modified" : "2022-06-14T20:23:55Z",
  "published" : "2021-08-25T20:54:22Z",
  "aliases" : [ "CVE-2021-29937" ],
  "summary" : "Free of uninitialized memory in telemetry",
  "details" : "An issue was discovered in the telemetry crate through 0.1.2 for Rust. There is a drop of uninitialized memory if a value.clone() call panics within misc::vec_with_size()",
  "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" : "telemetry"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.1.3"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-29937"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/Yoric/telemetry.rs/issues/45"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/Yoric/telemetry.rs/commit/2820cf12f2e08645fd6d1f15b4a90a54d6082a81"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/Yoric/telemetry.rs"
  }, {
    "type" : "WEB",
    "url" : "https://rustsec.org/advisories/RUSTSEC-2021-0046.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-908" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-08-19T17:09:26Z",
    "nvd_published_at" : "2021-04-01T05:15:00Z"
  }
}