CVE-2021-28034: Stack dst Double Free Vulnerability

CRITICAL
Advisory Identifier: GHSA-8mjx-h23h-w2pg
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CVSS 9.8
CWE-415
Published
Advisory Summary

CVE-2021-28034 is a CRITICAL (CVSS 9.8) double free vulnerability (CWE-415: Double Free) affecting Stack dst libraries in the crates.io ecosystem. The issue involves double free in stack_dst. Remediation is available by upgrading affected packages to version 0.6.1.

CVE-2021-28034 at a Glance

CVE Identifier CVE-2021-28034
GHSA Identifier GHSA-8mjx-h23h-w2pg
Severity CRITICAL
CVSS v3.1 Base Score 9.8
CWE Classification CWE-415: Double Free
Affected Product Stack dst
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-2021-28034

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

stack_dst fixed: 0.6.1 
Upgrade stack_dst to 0.6.1
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 stack_dst

How to Check if You Are Affected

To determine whether your application is affected by CVE-2021-28034, inspect your project dependencies for Stack dst:

inspect dependencies for stack_dst

Analyze the terminal output to locate any version of Stack dst in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.6.1), 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 Stack dst, 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

Affected versions of stack_dst used a push_inner function that increased the internal length of the array and then called val.clone(). If the val.clone() call panics, the stack could drop an already dropped element or drop uninitialized memory. This issue was fixed in `2a4d538` by increasing the length of the array after elements are cloned.

CVE-2021-28034 Affected Stack dst Versions

1 component(s)
Fixed Versions:
0.6.1
Product / Package Ecosystem Affected Versions Fixed Version
stack_dst
 crates.io
< 0.6.1
0.6.1

References

NVD — CVE-2021-28034 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-28034
Stack dst Source Repository REPOSITORY
https://github.com/thepowersgang/stack_dst-rs/issues/5
Security Fix Commit FIX COMMIT
https://github.com/thepowersgang/stack_dst-rs/commit/2a4d538
Security Fix Commit FIX COMMIT
https://github.com/thepowersgang/stack_dst-rs/commit/2a4d53809e3000f40085f2b229b6b1a33759881d
Stack dst Source Repository REPOSITORY
https://github.com/thepowersgang/stack_dst-rs
rustsec.org/advisories/rustsec-... WEB
https://rustsec.org/advisories/RUSTSEC-2021-0033.html

Frequently Asked Questions

What is CVE-2021-28034?
CVE-2021-28034 is a security vulnerability in Stack dst involving Double free in stack_dst under CWE-415: Double Free.
Which Stack dst versions are affected?
Affected versions include releases prior to 0.6.1 across affected packages: stack_dst.
What version fixes CVE-2021-28034?
Upgrading to 0.6.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is stack_dst affected?
Yes, stack_dst is affected in releases prior to 0.6.1. Upgrade your dependency to 0.6.1 or later.
What is the CVSS score of CVE-2021-28034?
CVE-2021-28034 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-2021-28034?
CVE-2021-28034 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-2021-28034?
Run the dependency tree command: 'inspect dependencies for stack_dst'. 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-8mjx-h23h-w2pg",
  "modified" : "2023-06-13T20:52:43Z",
  "published" : "2021-09-01T18:30:44Z",
  "aliases" : [ "CVE-2021-28034" ],
  "summary" : "Double free in stack_dst",
  "details" : "Affected versions of stack_dst used a push_inner function that increased the internal length of the array and then called val.clone(). If the val.clone() call panics, the stack could drop an already dropped element or drop uninitialized memory. This issue was fixed in `2a4d538` by increasing the length of the array after elements are cloned.",
  "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" : "stack_dst"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.6.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-28034"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/thepowersgang/stack_dst-rs/issues/5"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/thepowersgang/stack_dst-rs/commit/2a4d538"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/thepowersgang/stack_dst-rs/commit/2a4d53809e3000f40085f2b229b6b1a33759881d"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/thepowersgang/stack_dst-rs"
  }, {
    "type" : "WEB",
    "url" : "https://rustsec.org/advisories/RUSTSEC-2021-0033.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-415" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-08-30T21:56:32Z",
    "nvd_published_at" : "2021-03-05T09:15:00Z"
  }
}