CVE-2021-28306: Fltk Null Pointer Deference Vulnerability

HIGH
Advisory Identifier: GHSA-5pg8-h4gv-m3p8
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CVSS 7.5
CWE-476
Published
Advisory Summary

CVE-2021-28306 is a HIGH (CVSS 7.5) null pointer deference vulnerability (CWE-476: NULL Pointer Dereference) affecting Fltk libraries in the crates.io ecosystem. The issue involves null pointer deference in fltk. Remediation is available by upgrading affected packages to version 0.15.3.

CVE-2021-28306 at a Glance

CVE Identifier CVE-2021-28306
GHSA Identifier GHSA-5pg8-h4gv-m3p8
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-476: NULL Pointer Dereference
Affected Product Fltk
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-2021-28306

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

fltk fixed: 0.15.3 
Upgrade fltk to 0.15.3
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 fltk

How to Check if You Are Affected

To determine whether your application is affected by CVE-2021-28306, inspect your project dependencies for Fltk:

inspect dependencies for fltk

Analyze the terminal output to locate any version of Fltk in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.15.3), 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-476: NULL Pointer Dereference, where the product dereferences a pointer that it expects to be valid but is null. In Fltk, 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 fltk crate before 0.15.3 for Rust. There is a NULL pointer dereference during attempted use of a multi label type if the image is nonexistent.

CVE-2021-28306 Affected Fltk Versions

1 component(s)
Fixed Versions:
0.15.3
Product / Package Ecosystem Affected Versions Fixed Version
fltk
 crates.io
< 0.15.3
0.15.3

References

NVD — CVE-2021-28306 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-28306
Fltk Source Repository REPOSITORY
https://github.com/MoAlyousef/fltk-rs/issues/519
Fltk Source Repository REPOSITORY
https://github.com/MoAlyousef/fltk-rs
rustsec.org/advisories/rustsec-... WEB
https://rustsec.org/advisories/RUSTSEC-2021-0038.html

Frequently Asked Questions

What is CVE-2021-28306?
CVE-2021-28306 is a security vulnerability in Fltk involving Null pointer deference in fltk under CWE-476: NULL Pointer Dereference.
Which Fltk versions are affected?
Affected versions include releases prior to 0.15.3 across affected packages: fltk.
What version fixes CVE-2021-28306?
Upgrading to 0.15.3 (or the latest patched release for your respective branch) resolves the vulnerability.
Is fltk affected?
Yes, fltk is affected in releases prior to 0.15.3. Upgrade your dependency to 0.15.3 or later.
What is the CVSS score of CVE-2021-28306?
CVE-2021-28306 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-2021-28306?
CVE-2021-28306 is classified under CWE-476: NULL Pointer Dereference (The product dereferences a pointer that it expects to be valid but is NULL.).
How can I check crates.io dependencies for CVE-2021-28306?
Run the dependency tree command: 'inspect dependencies for fltk'. 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-5pg8-h4gv-m3p8",
  "modified" : "2021-08-19T17:22:27Z",
  "published" : "2021-08-25T20:53:56Z",
  "aliases" : [ "CVE-2021-28306" ],
  "summary" : "Null pointer deference in fltk",
  "details" : "An issue was discovered in the fltk crate before 0.15.3 for Rust. There is a NULL pointer dereference during attempted use of a multi label type if the image is nonexistent.",
  "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" : "fltk"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.15.3"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-28306"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/MoAlyousef/fltk-rs/issues/519"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/MoAlyousef/fltk-rs"
  }, {
    "type" : "WEB",
    "url" : "https://rustsec.org/advisories/RUSTSEC-2021-0038.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-476" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-08-19T17:22:27Z",
    "nvd_published_at" : null
  }
}