CVE-2021-29938: Slice deque Double Free Vulnerability

HIGH
Advisory Identifier: GHSA-p9gf-gmfv-398m
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CVSS 7.5
CWE-415
Published
Advisory Summary

CVE-2021-29938 is a HIGH (CVSS 7.5) double free vulnerability (CWE-415: Double Free) affecting Slice deque libraries in the crates.io ecosystem. The issue involves double free in slice-deque. Remediation is available in the latest vendor maintenance releases.

CVE-2021-29938 at a Glance

CVE Identifier CVE-2021-29938
GHSA Identifier GHSA-p9gf-gmfv-398m
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-415: Double Free
Affected Product Slice deque
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-2021-29938

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

slice-deque fixed: Latest secure release 
Upgrade slice-deque 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 slice-deque

How to Check if You Are Affected

To determine whether your application is affected by CVE-2021-29938, inspect your project dependencies for Slice deque:

inspect dependencies for slice-deque

Analyze the terminal output to locate any version of Slice deque 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-415: Double Free, where the product calls free() twice on the same memory address. In Slice deque, 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 slice-deque crate through 2021-02-19 for Rust. A double drop can occur in SliceDeque::drain_filter upon a panic in a predicate function.

CVE-2021-29938 Affected Slice deque Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
slice-deque
 crates.io
≤ 0.3.0

References

NVD — CVE-2021-29938 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-29938
Slice deque Source Repository REPOSITORY
https://github.com/gnzlbg/slice_deque/issues/90
Slice deque Source Repository REPOSITORY
https://github.com/gnzlbg/slice_deque
rustsec.org/advisories/rustsec-... WEB
https://rustsec.org/advisories/RUSTSEC-2021-0047.html

Frequently Asked Questions

What is CVE-2021-29938?
CVE-2021-29938 is a security vulnerability in Slice deque involving Double free in slice-deque under CWE-415: Double Free.
Which Slice deque versions are affected?
Affected versions include releases prior to current release patches across affected packages: slice-deque.
What version fixes CVE-2021-29938?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is slice-deque affected?
Yes, slice-deque 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-2021-29938?
CVE-2021-29938 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-2021-29938?
CVE-2021-29938 is classified under CWE-415: Double Free (The product calls free() twice on the same memory address.).
How can I check crates.io dependencies for CVE-2021-29938?
Run the dependency tree command: 'inspect dependencies for slice-deque'. 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-p9gf-gmfv-398m",
  "modified" : "2023-03-30T23:01:08Z",
  "published" : "2021-08-25T20:54:16Z",
  "aliases" : [ "CVE-2021-29938" ],
  "summary" : "Double free in slice-deque",
  "details" : "An issue was discovered in the slice-deque crate through 2021-02-19 for Rust. A double drop can occur in SliceDeque::drain_filter upon a panic in a predicate function.",
  "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" : "slice-deque"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "0.3.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-29938"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/gnzlbg/slice_deque/issues/90"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/gnzlbg/slice_deque"
  }, {
    "type" : "WEB",
    "url" : "https://rustsec.org/advisories/RUSTSEC-2021-0047.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-415" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-08-19T17:14:58Z",
    "nvd_published_at" : null
  }
}